[Lazarus] test if the list is down, since 21.3.13 no mails?!!
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[Lazarus] AdjustClientRect or GetLogicalClientRect: which one to override?
Hi, For a component I'm building I need to let the subcomponents know that (for aligning) they cannot use the entire client space. (It is a panel descendant with asymmetrical bevels). At first I tried AdjustClientRect but that did not work, so I tried GetLogicalClientRect. It all seems to work as expected. Subcomponents align to the new borders. Then the compiler told me (well, it did before, but I didn't notice) that I forgot to add the override to AdjustClientRect. I fixed that (and got rid of the overridden GetLogicalClientRect), and this also works. So, here's my question: which of these two methods is the right one to override in this example? And what is the other method intende for? Bart -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] New control TLvlGraphControl and new IDE package graph
Hi, I added a new control TLvlGraphControl to package LazControls. It is a LCL control showing a graph as level graph. Another name is layered graph. See the screenshot and see here: http://wiki.lazarus.freepascal.org/Lazarus_1.2.0_release_notes#TLvlGraphControl Level graphs can visualize hundreds of nodes and thousands of edges on a single screen, reducing the need to scroll. This control has the ability to highlight the edges under the mouse, so that even complex graphs with thousands of edges can be explored. And it highlights back edges so you can quickly find cycles. The screenshot is from the IDE's Package Graph. Mattias attachment: packagegraph1.png-- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On 24-3-2013 13:08, Mattias Gaertner wrote: Hi, I added a new control TLvlGraphControl to package LazControls. It is a LCL control showing a graph as level graph. Another name is layered graph. See the screenshot and see here: http://wiki.lazarus.freepascal.org/Lazarus_1.2.0_release_notes#TLvlGraphControl Level graphs can visualize hundreds of nodes and thousands of edges on a single screen, reducing the need to scroll. This control has the ability to highlight the edges under the mouse, so that even complex graphs with thousands of edges can be explored. And it highlights back edges so you can quickly find cycles. The screenshot is from the IDE's Package Graph. Yep, had noticed that - very handy! Thanks a lot, Reinier -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On 24.03.2013 13:08, Mattias Gaertner wrote: Hi, I added a new control TLvlGraphControl to package LazControls. It is a LCL control showing a graph as level graph. Another name is layered graph. See the screenshot and see here: http://wiki.lazarus.freepascal.org/Lazarus_1.2.0_release_notes#TLvlGraphControl Level graphs can visualize hundreds of nodes and thousands of edges on a single screen, reducing the need to scroll. This control has the ability to highlight the edges under the mouse, so that even complex graphs with thousands of edges can be explored. And it highlights back edges so you can quickly find cycles. The screenshot is from the IDE's Package Graph. Oooo... nice. It will be interesting to see how this component copes with the dependency graph of the compiler units... hehe ^^ Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] How to send Email from Lazarus program under Linux x86-64
Hi All! I am trying to implement a program that will send emails to (a subset of) an application-specific roster. I found numerous references to synapse so I downloaded the source which includes a .lpk library (it is several years old). When I tried to compile it under Lazarus 1.1, fpc 2.6.2, the compiler could not find a method called inet_addr. I searched the synapse source code and it showed numerous references to inet_addr, but no place where it was defined for fpc. I hacked the code so it used linux rather than fpc and it failed while looking for unit libc, before ever getting to the inet_addr declaration. I looked for libc and found that it is obsolete and does not seem to be available for 64-bit systems anyway. Has anyone had success in using this library under Linux (x86-64)? I also examined Indy (which I used successfully years ago on Delphi/Borland c++ Builder) but it, too, is obsolete (latest updates seem to be circa 2006) and comes with many, many warnings and caveats. I found Mailpas (also from 2006) but I am having problems compiling the library -- it says it can't find a file which really is there where it is supposed to be. -- During the long mailing list shutdown I found that the compiler message about a non-existent include file was wrong. The actual failure was that the include file uses libc which does not exist on my system (same problem as with synapse). I'll submit a bug report as soon as I can. Is there any other smtp and pop3 code available for Lazarus or will I have to generate my own from scratch? Thanks, Don Ziesig -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] How to send Email from Lazarus program under Linux x86-64
On 24-3-2013 15:19, Donald Ziesig wrote: Hi All! I am trying to implement a program that will send emails to (a subset of) an application-specific roster. I found numerous references to synapse so I downloaded the source which includes a .lpk library (it is several years old). Yep, seems about 3 years old: cd C:\Development\extras\synapse svn log laz_synapse.lpk | more r129 | geby | 2010-07-02 12:46:39 +0200 (vr, 02 jul 2010) | 3 lines - improved MACOS compatibility - workaround for some broken virtual serial ports - Added Lazarus package Has anyone had success in using this library under Linux (x86-64)? Yes. See e.g. fpctwit, which happily runs under Linux. Also, the fpcup Lazarus/fpc updater can install synapse for you, also the synapse trunk version. AFAIK no need to change any synapse files. Please see the wiki page on synapse: http://wiki.lazarus.freepascal.org/synapse I also examined Indy (which I used successfully years ago on Delphi/Borland c++ Builder) but it, too, is obsolete (latest updates seem to be circa 2006) and comes with many, many warnings and caveats. Please see the indy wiki page: ... ah well, you'll be able to find it. It's cross referenced in the synapse page as well IIRC. Is there any other smtp and pop3 code available for Lazarus or will I have to generate my own from scratch? There certainly is. IIRC, LazSolutions has code for sending email. Synapse comes with an email example, or has it in the examples directory on their site. Code for sending email using synapse is floating around on e.g. the synapse mailing list... Good luck, Reinier -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] How to send Email from Lazarus program under Linux x86-64
2013/3/24 reinierolislag...@gmail.com On 24-3-2013 15:19, Donald Ziesig wrote: Hi All! I am trying to implement a program that will send emails to (a subset of) an application-specific roster. I found numerous references to synapse so I downloaded the source which includes a .lpk library (it is several years old). Yep, seems about 3 years old: cd C:\Development\extras\synapse svn log laz_synapse.lpk | more r129 | geby | 2010-07-02 12:46:39 +0200 (vr, 02 jul 2010) | 3 lines - improved MACOS compatibility - workaround for some broken virtual serial ports - Added Lazarus package Has anyone had success in using this library under Linux (x86-64)? Yes. See e.g. fpctwit, which happily runs under Linux. Also, the fpcup Lazarus/fpc updater can install synapse for you, also the synapse trunk version. AFAIK no need to change any synapse files. Please see the wiki page on synapse: http://wiki.lazarus.freepascal.org/synapse I also examined Indy (which I used successfully years ago on Delphi/Borland c++ Builder) but it, too, is obsolete (latest updates seem to be circa 2006) and comes with many, many warnings and caveats. Please see the indy wiki page: ... ah well, you'll be able to find it. It's cross referenced in the synapse page as well IIRC. Is there any other smtp and pop3 code available for Lazarus or will I have to generate my own from scratch? There certainly is. IIRC, LazSolutions has code for sending email. Synapse comes with an email example, or has it in the examples directory on their site. Code for sending email using synapse is floating around on e.g. the synapse mailing list... Good luck, Reinier Thanks for the indication Reinier! :) Meet the XMailer also: https://github.com/silvioprog/xmailer XMailer is a nice plugin for send e-mails easily. It's improved derivation of LSSendMail. :) (it use Synapse too, and offers support to UTF-8) -- Silvio Clécio My public projects - github.com/silvioprog -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
Mattias Gaertner schrieb: Hi, I added a new control TLvlGraphControl to package LazControls. It is a LCL control showing a graph as level graph. Another name is layered graph. See the screenshot and see here: http://wiki.lazarus.freepascal.org/Lazarus_1.2.0_release_notes#TLvlGraphControl Nice :-) Level graphs can visualize hundreds of nodes and thousands of edges on a single screen, reducing the need to scroll. This control has the ability to highlight the edges under the mouse, so that even complex graphs with thousands of edges can be explored. And it highlights back edges so you can quickly find cycles. The screenshot is from the IDE's Package Graph. Did you already consider to analyze the graph using methods known from the theory of graphs, like splitting the graph into components? Graph components can help to structure the display of the entire graph, so that e.g. a component can be represented as a single node on the screen, which then can be expanded on demand into a more detailed representation. DoDi -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On Sun, 24 Mar 2013 16:31:10 +0100 Hans-Peter Diettrich drdiettri...@aol.com wrote: Mattias Gaertner schrieb: Hi, I added a new control TLvlGraphControl to package LazControls. It is a LCL control showing a graph as level graph. Another name is layered graph. See the screenshot and see here: http://wiki.lazarus.freepascal.org/Lazarus_1.2.0_release_notes#TLvlGraphControl Nice :-) Thanks. Level graphs can visualize hundreds of nodes and thousands of edges on a single screen, reducing the need to scroll. This control has the ability to highlight the edges under the mouse, so that even complex graphs with thousands of edges can be explored. And it highlights back edges so you can quickly find cycles. The screenshot is from the IDE's Package Graph. Did you already consider to analyze the graph using methods known from the theory of graphs, like splitting the graph into components? TLvlGraph has a property Graph: TLvlGraph, that consists of nodes and edges. The nodes have arrays of InEdges and OutEdges. So implementing the normal graph algorithms should be pretty straightforward. Graph components can help to structure the display of the entire graph, so that e.g. a component can be represented as a single node on the screen, which then can be expanded on demand into a more detailed representation. Yes, that was my first idea too for packages and units. But it seems it is more helpful to simply use another lvlgraph for the details. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
This is close to the reverse engineered class diagram tool that was discussed already a long time ago. I thought the most difficult part is automatic layout calculation and this component implements it quite perfectly. Cool! Still, it cannot be directly used for a class diagram because there not only nodes connect to each other but a connection can be from a property inside a node. It could be extended with special nodes having connection points, and edges (lines) having graphs at the ends. At least a diamond and a circle graph is needed for class diagram lines. Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On Sun, 24 Mar 2013 13:56:31 +0100 Sven Barth pascaldra...@googlemail.com wrote: [...] Oooo... nice. It will be interesting to see how this component copes with the dependency graph of the compiler units... hehe ^^ Here is are two screenshots of the compiler units. The first shows the compiler/x86 directory, the second the compiler/systems directory. For the units of the compiler directory you need a 4k screen and it's very messy. This needs some specials. Like filtering or something like the components suggested by DoDi. Mattias attachment: compiler_x86.pngattachment: compiler_systems.png-- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On 24.03.2013 17:41, Mattias Gaertner wrote: On Sun, 24 Mar 2013 13:56:31 +0100 Sven Barth pascaldra...@googlemail.com wrote: [...] Oooo... nice. It will be interesting to see how this component copes with the dependency graph of the compiler units... hehe ^^ Here is are two screenshots of the compiler units. The first shows the compiler/x86 directory, the second the compiler/systems directory. For the units of the compiler directory you need a 4k screen and it's very messy. This needs some specials. Like filtering or something like the components suggested by DoDi. Components won't help here as the compiler is too interconnected (though the CPU directories look rather nice ^^). I've written a little tool some weeks ago which uses fcl-passrc to extract the unit dependencies and prints a dot file which can be processed by Graphviz. With this I wanted to check where we might have cycles and if we could fix their detection, but for now I've given up, because the graph is to messy. As a next step I planned to implement a Circos (see http://circos.ca/images/ ) backend for that tool... Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
2013/3/24 Sven Barth pascaldra...@googlemail.com: I've written a little tool some weeks ago which uses fcl-passrc to extract the unit dependencies and prints a dot file which can be processed by Graphviz. With this I wanted to check where we might have cycles and if we could fix their detection, but for now I've given up, because the graph is to messy. As a next step I planned to implement a Circos (see http://circos.ca/images/ ) backend for that tool... Did you try a DSM? I've successfuly used this approach to find cycles as well as helping me to elaborate a migration strategy of a little messy project =) http://en.wikipedia.org/wiki/Design_structure_matrix Joao Morais -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] New control TLvlGraphControl and new IDE package graph
On 24.03.2013 17:55, Joao Morais wrote: 2013/3/24 Sven Barth pascaldra...@googlemail.com: I've written a little tool some weeks ago which uses fcl-passrc to extract the unit dependencies and prints a dot file which can be processed by Graphviz. With this I wanted to check where we might have cycles and if we could fix their detection, but for now I've given up, because the graph is to messy. As a next step I planned to implement a Circos (see http://circos.ca/images/ ) backend for that tool... Did you try a DSM? I've successfuly used this approach to find cycles as well as helping me to elaborate a migration strategy of a little messy project =) http://en.wikipedia.org/wiki/Design_structure_matrix A design structure matrix aka adjency matrix is just a graph in matrix form... And I personally prefer visual approaches here :) [even if it should mean that I'll need a 4k beamer or a DIN A0 printer to view this correctly :P ] Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On Sun, 24 Mar 2013 14:51:26 -0300 Leonardo M. Ramé l.r...@griensu.com wrote: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); end; As you can see, on each iteration, one PWord is copied. What I would like to do, is to copy bigger blocks, for example: lStream.WriteBuffer(lTmpBuff^, lBufSize); lStream.WriteBuffer(lTmpBuff^, lBufSize*SizeOf(Word)); [...] Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 19:02:18 +0100, Mattias Gaertner wrote: On Sun, 24 Mar 2013 14:51:26 -0300 Leonardo M. Ramé l.r...@griensu.com wrote: lStream.WriteBuffer(lTmpBuff^, lBufSize*SizeOf(Word)); I've already tried that, but it doesn't work as expected. Maybe the problem is caused because lBufSize is a longint, instead of Word or LongWord?. -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); Joao Morais -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 15:19:11 -0300, Joao Morais wrote: 2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); I've already tried that, but the only way it works is incrementing by just 1. -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 19:19, Joao Morais wrote: 2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). Regarding lBufSize it will be important to know whether the C code returns the size in elements or in byte. Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On Sun, 24 Mar 2013 19:21:49 +0100 Sven Barth pascaldra...@googlemail.com wrote: [...] Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). I guess, you mean multiples of SizeOf(Word). Regarding lBufSize it will be important to know whether the C code returns the size in elements or in byte. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 19:24, Mattias Gaertner wrote: On Sun, 24 Mar 2013 19:21:49 +0100 Sven Barth pascaldra...@googlemail.com wrote: [...] Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). I guess, you mean multiples of SizeOf(Word). Of course :) Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 19:21:49 +0100, Sven Barth wrote:
On 24.03.2013 19:19, Joao Morais wrote:
2013/3/24 Leonardo M. Ramé l.r...@griensu.com:
Hi, I'm copying a buffer of PWord to a TMemoryStream using this code:
lTmpBuff := lBuffer;
I := 0;
while I lBufSize do
begin
lStream.Write(lTmpBuff^, SizeOf(PWord));
inc(lTmpBuff, 1);
inc(I, 1);
What about:
inc(lTmpBuff, SizeOf(PWord));
inc(I, SizeOf(PWord));
If lTmpBuff is declared as PWord then Inc already increases in
multiplies of SizeOf(PWord).
Regarding lBufSize it will be important to know whether the C code
returns the size in elements or in byte.
Heres the interface of the library:
myfunction(void * buffer, unsigned long bufSize)
{
bufsize = interdata-getcount() * sizeof(uint16);
buffer = new uint16[bufSize];
// interdata is an object containing image data
memcpy((void *)buffer, interdata-getData(), interdata-getCount());
}
So, I'm using this variables:
lTmpBuff: PWord;
lBufSize: longword;
I: Integer;
--
Leonardo M. Ramé
http://leonardorame.blogspot.com
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Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 19:30, Leonardo M. Ramé wrote:
On 2013-03-24 19:21:49 +0100, Sven Barth wrote:
On 24.03.2013 19:19, Joao Morais wrote:
2013/3/24 Leonardo M. Ramé l.r...@griensu.com:
Hi, I'm copying a buffer of PWord to a TMemoryStream using this code:
lTmpBuff := lBuffer;
I := 0;
while I lBufSize do
begin
lStream.Write(lTmpBuff^, SizeOf(PWord));
inc(lTmpBuff, 1);
inc(I, 1);
What about:
inc(lTmpBuff, SizeOf(PWord));
inc(I, SizeOf(PWord));
If lTmpBuff is declared as PWord then Inc already increases in
multiplies of SizeOf(PWord).
Regarding lBufSize it will be important to know whether the C code
returns the size in elements or in byte.
Heres the interface of the library:
myfunction(void * buffer, unsigned long bufSize)
{
bufsize = interdata-getcount() * sizeof(uint16);
So bufsize contains the amount of Bytes.
buffer = new uint16[bufSize];
Ehm... shouldn't this be new uint16[interdata-getcount()]? Because
currently if your getcount() function returns e.g. 42 you will
allocate an array containing 84 elements...
// interdata is an object containing image data
memcpy((void *)buffer, interdata-getData(), interdata-getCount());
}
So assuming that lBuffer is passed as the buffer argument and lBufSize
as the bufSize one then your old code is wrong.
It should look like this:
=== code begin ===
I := 0;
while I lBufSize do begin
lStream.Write(lTmpBuffer^, SizeOf(Word)); // do you really have
SizeOf(PWord) there?
Inc(lTmpBuff); // move pointer by one element
Inc(I, SizeOf(Word)); // we need to increase I by the element size
end;
=== code end ===
An alternative would be:
=== code begin ===
for I := 0 to lBufSize div SizeOf(Word) do
lStream.Write(lBuffer[I], SizeOf(Word));
=== code end ===
And to finally write all data at once:
=== code begin ===
lStream.Write(lBuffer^, lBufSize); // as lBufSize is the byte size, this
is correct without further multiplication
=== code end ===
Now if your C function is written correctly, all three should give you
the same result.
Regards,
Sven
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Re: [Lazarus] AdjustClientRect or GetLogicalClientRect: which one to override?
On Sun, 24 Mar 2013 12:19:24 +0100 Bart bartjun...@gmail.com wrote: [...] Then the compiler told me (well, it did before, but I didn't notice) that I forgot to add the override to AdjustClientRect. I fixed that (and got rid of the overridden GetLogicalClientRect), and this also works. So, here's my question: which of these two methods is the right one to override in this example? And what is the other method intende for? The LCL uses the output of GetLogicalClientRect as input for AdjustClientRect. AdjustClientRect: http://wiki.freepascal.org/Autosize_/_Layout#AdjustClientRect GetLogicalClientRect: http://wiki.freepascal.org/Autosize_/_Layout#Scrolling So, you can use either AdjustClientRect or the ChildSizing properties. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 19:46:09 +0100, Sven Barth wrote:
On 24.03.2013 19:30, Leonardo M. Ramé wrote:
On 2013-03-24 19:21:49 +0100, Sven Barth wrote:
On 24.03.2013 19:19, Joao Morais wrote:
2013/3/24 Leonardo M. Ramé l.r...@griensu.com:
Hi, I'm copying a buffer of PWord to a TMemoryStream using this code:
lTmpBuff := lBuffer;
I := 0;
while I lBufSize do
begin
lStream.Write(lTmpBuff^, SizeOf(PWord));
inc(lTmpBuff, 1);
inc(I, 1);
What about:
inc(lTmpBuff, SizeOf(PWord));
inc(I, SizeOf(PWord));
If lTmpBuff is declared as PWord then Inc already increases in
multiplies of SizeOf(PWord).
Regarding lBufSize it will be important to know whether the C code
returns the size in elements or in byte.
Heres the interface of the library:
myfunction(void * buffer, unsigned long bufSize)
{
bufsize = interdata-getcount() * sizeof(uint16);
So bufsize contains the amount of Bytes.
buffer = new uint16[bufSize];
Ehm... shouldn't this be new uint16[interdata-getcount()]?
Because currently if your getcount() function returns e.g. 42 you
will allocate an array containing 84 elements...
// interdata is an object containing image data
memcpy((void *)buffer, interdata-getData(), interdata-getCount());
}
So assuming that lBuffer is passed as the buffer argument and
lBufSize as the bufSize one then your old code is wrong.
It should look like this:
=== code begin ===
I := 0;
while I lBufSize do begin
lStream.Write(lTmpBuffer^, SizeOf(Word)); // do you really have
SizeOf(PWord) there?
Inc(lTmpBuff); // move pointer by one element
Inc(I, SizeOf(Word)); // we need to increase I by the element size
end;
=== code end ===
An alternative would be:
=== code begin ===
for I := 0 to lBufSize div SizeOf(Word) do
lStream.Write(lBuffer[I], SizeOf(Word));
=== code end ===
And to finally write all data at once:
=== code begin ===
lStream.Write(lBuffer^, lBufSize); // as lBufSize is the byte size,
this is correct without further multiplication
=== code end ===
Now if your C function is written correctly, all three should give
you the same result.
Thanks Sven, I modified the C function as this:
bufSize = interdata-getCount(); // - returns number of pixels
buffer = new Uint16[bufSize];
memcpy((void *)buffer, interdata-getData(), interdata-getCount());
Here's the getCount() documentation:
http://support.dcmtk.org/docs/classDiPixel.html#15bbe5e57b15ea67bbc9541752ce
Hence, my confusion is because I thought getCount was number of bytes,
but it is number of pixels :)
After changing the C function, now I can do this:
lStream.Write(lTmpBuff^, SizeOf(PWord));
inc(lTmpBuff);
inc(I, 2); // it also works with inc(I, 1) but not using inc(I,
sizeof(Word));
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http://leonardorame.blogspot.com
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Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 19:57, Leonardo M. Ramé wrote: On 2013-03-24 19:46:09 +0100, Sven Barth wrote: On 24.03.2013 19:30, Leonardo M. Ramé wrote: On 2013-03-24 19:21:49 +0100, Sven Barth wrote: On 24.03.2013 19:19, Joao Morais wrote: 2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). Regarding lBufSize it will be important to know whether the C code returns the size in elements or in byte. Heres the interface of the library: [snip] Now if your C function is written correctly, all three should give you the same result. Thanks Sven, I modified the C function as this: bufSize = interdata-getCount(); // - returns number of pixels buffer = new Uint16[bufSize]; memcpy((void *)buffer, interdata-getData(), interdata-getCount()); Here's the getCount() documentation: http://support.dcmtk.org/docs/classDiPixel.html#15bbe5e57b15ea67bbc9541752ce Hence, my confusion is because I thought getCount was number of bytes, but it is number of pixels :) After changing the C function, now I can do this: lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff); inc(I, 2); // it also works with inc(I, 1) but not using inc(I, sizeof(Word)); Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] How to send Email from Lazarus program under Linux x86-64
silvioprog wrote: 2013/3/24 reinierolislag...@gmail.com On 24-3-2013 15:19, Donald Ziesig wrote: Hi All! I am trying to implement a program that will send emails to (a subset of) an application-specific roster. I found numerous references to synapse so I downloaded the source which includes a .lpk library (it is several years old). Yep, seems about 3 years old: cd C:\Development\extras\synapse svn log laz_synapse.lpk | more r129 | geby | 2010-07-02 12:46:39 +0200 (vr, 02 jul 2010) | 3 lines - improved MACOS compatibility - workaround for some broken virtual serial ports - Added Lazarus package Has anyone had success in using this library under Linux (x86-64)? Yes. See e.g. fpctwit, which happily runs under Linux. Also, the fpcup Lazarus/fpc updater can install synapse for you, also the synapse trunk version. AFAIK no need to change any synapse files. Please see the wiki page on synapse: http://wiki.lazarus.freepascal.org/synapse I also examined Indy (which I used successfully years ago on Delphi/Borland c++ Builder) but it, too, is obsolete (latest updates seem to be circa 2006) and comes with many, many warnings and caveats. Please see the indy wiki page: ... ah well, you'll be able to find it. It's cross referenced in the synapse page as well IIRC. Is there any other smtp and pop3 code available for Lazarus or will I have to generate my own from scratch? There certainly is. IIRC, LazSolutions has code for sending email. Synapse comes with an email example, or has it in the examples directory on their site. Code for sending email using synapse is floating around on e.g. the synapse mailing list... Good luck, Reinier Thanks for the indication Reinier! :) Meet the XMailer also: https://github.com/silvioprog/xmailer XMailer is a nice plugin for send e-mails easily. It's improved derivation of LSSendMail. :) (it use Synapse too, and offers support to UTF-8) Thanks Silvio. Now I need to try and update this code: http://www.turbocontrol.com/easyemail.htm -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 20:14, Leonardo M. Ramé wrote: On 2013-03-24 20:02:38 +0100, Sven Barth wrote: On 24.03.2013 19:57, Leonardo M. Ramé wrote: On 2013-03-24 19:46:09 +0100, Sven Barth wrote: On 24.03.2013 19:30, Leonardo M. Ramé wrote: On 2013-03-24 19:21:49 +0100, Sven Barth wrote: On 24.03.2013 19:19, Joao Morais wrote: 2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). Regarding lBufSize it will be important to know whether the C code returns the size in elements or in byte. Heres the interface of the library: [snip] Now if your C function is written correctly, all three should give you the same result. Thanks Sven, I modified the C function as this: bufSize = interdata-getCount(); // - returns number of pixels buffer = new Uint16[bufSize]; memcpy((void *)buffer, interdata-getData(), interdata-getCount()); Here's the getCount() documentation: http://support.dcmtk.org/docs/classDiPixel.html#15bbe5e57b15ea67bbc9541752ce Hence, my confusion is because I thought getCount was number of bytes, but it is number of pixels :) After changing the C function, now I can do this: lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff); inc(I, 2); // it also works with inc(I, 1) but not using inc(I, sizeof(Word)); Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Yes, the code looks correct, but it still creates the wrong resulting image. If you look at the attachment, the upper image is the result of your last suggestion, while the lower image was created using the while loop I've shown. I'll re-check my drawing function, maybe your code is correct and the problem is on that function. I just noticed that you are still using SizeOf(PWord) in your lStream.Write. This is wrong. You want to copy one Word element (SizeOf(Word)=2) instead of two/four (depending on 32 vs 64 bit SizeOf(PWord) is either 4 or 8). Which is also why your Inc(..., 2) works as you are copying multiple entries at once. Regards, Sven Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 20:29:44 +0100, Sven Barth wrote: On 24.03.2013 20:14, Leonardo M. Ramé wrote: On 2013-03-24 20:02:38 +0100, Sven Barth wrote: On 24.03.2013 19:57, Leonardo M. Ramé wrote: On 2013-03-24 19:46:09 +0100, Sven Barth wrote: On 24.03.2013 19:30, Leonardo M. Ramé wrote: On 2013-03-24 19:21:49 +0100, Sven Barth wrote: On 24.03.2013 19:19, Joao Morais wrote: 2013/3/24 Leonardo M. Ramé l.r...@griensu.com: Hi, I'm copying a buffer of PWord to a TMemoryStream using this code: lTmpBuff := lBuffer; I := 0; while I lBufSize do begin lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff, 1); inc(I, 1); What about: inc(lTmpBuff, SizeOf(PWord)); inc(I, SizeOf(PWord)); If lTmpBuff is declared as PWord then Inc already increases in multiplies of SizeOf(PWord). Regarding lBufSize it will be important to know whether the C code returns the size in elements or in byte. Heres the interface of the library: [snip] Now if your C function is written correctly, all three should give you the same result. Thanks Sven, I modified the C function as this: bufSize = interdata-getCount(); // - returns number of pixels buffer = new Uint16[bufSize]; memcpy((void *)buffer, interdata-getData(), interdata-getCount()); Here's the getCount() documentation: http://support.dcmtk.org/docs/classDiPixel.html#15bbe5e57b15ea67bbc9541752ce Hence, my confusion is because I thought getCount was number of bytes, but it is number of pixels :) After changing the C function, now I can do this: lStream.Write(lTmpBuff^, SizeOf(PWord)); inc(lTmpBuff); inc(I, 2); // it also works with inc(I, 1) but not using inc(I, sizeof(Word)); Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Yes, the code looks correct, but it still creates the wrong resulting image. If you look at the attachment, the upper image is the result of your last suggestion, while the lower image was created using the while loop I've shown. I'll re-check my drawing function, maybe your code is correct and the problem is on that function. I just noticed that you are still using SizeOf(PWord) in your lStream.Write. This is wrong. You want to copy one Word element (SizeOf(Word)=2) instead of two/four (depending on 32 vs 64 bit SizeOf(PWord) is either 4 or 8). Which is also why your Inc(..., 2) works as you are copying multiple entries at once. Well, this is funny, after re-checking the code, I noted it works if I use this: (1) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(PWord)); But, using SizeOf(Word) doesn't: (2) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(Word)); What I would like to achieve is this: (3) lUnCompressed.WriteBuffer(lTmpBuff^, lBufSize * SizeOf(Word)); But using this, I get the same result of (2). -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 20:39, Leonardo M. Ramé wrote: Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Yes, the code looks correct, but it still creates the wrong resulting image. If you look at the attachment, the upper image is the result of your last suggestion, while the lower image was created using the while loop I've shown. I'll re-check my drawing function, maybe your code is correct and the problem is on that function. I just noticed that you are still using SizeOf(PWord) in your lStream.Write. This is wrong. You want to copy one Word element (SizeOf(Word)=2) instead of two/four (depending on 32 vs 64 bit SizeOf(PWord) is either 4 or 8). Which is also why your Inc(..., 2) works as you are copying multiple entries at once. Well, this is funny, after re-checking the code, I noted it works if I use this: (1) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(PWord)); But, using SizeOf(Word) doesn't: (2) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(Word)); What I would like to achieve is this: (3) lUnCompressed.WriteBuffer(lTmpBuff^, lBufSize * SizeOf(Word)); But using this, I get the same result of (2). Maybe your problem is indeed in your drawing function. Because the usage of SizeOf(PWord) is definitely wrong if your lBuffer basically contains Word sized pixels after each other. You should currently even get different results depending on whether the application is 32 or 64 bit. Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 2013-03-24 20:44:50 +0100, Sven Barth wrote: On 24.03.2013 20:39, Leonardo M. Ramé wrote: Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Yes, the code looks correct, but it still creates the wrong resulting image. If you look at the attachment, the upper image is the result of your last suggestion, while the lower image was created using the while loop I've shown. I'll re-check my drawing function, maybe your code is correct and the problem is on that function. I just noticed that you are still using SizeOf(PWord) in your lStream.Write. This is wrong. You want to copy one Word element (SizeOf(Word)=2) instead of two/four (depending on 32 vs 64 bit SizeOf(PWord) is either 4 or 8). Which is also why your Inc(..., 2) works as you are copying multiple entries at once. Well, this is funny, after re-checking the code, I noted it works if I use this: (1) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(PWord)); But, using SizeOf(Word) doesn't: (2) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(Word)); What I would like to achieve is this: (3) lUnCompressed.WriteBuffer(lTmpBuff^, lBufSize * SizeOf(Word)); But using this, I get the same result of (2). Maybe your problem is indeed in your drawing function. Because the usage of SizeOf(PWord) is definitely wrong if your lBuffer basically contains Word sized pixels after each other. You should currently even get different results depending on whether the application is 32 or 64 bit. Regards, Sven Sven, I can confirm the image display function was wrong. Now I can write all data to the stream at once!. -- Leonardo M. Ramé http://leonardorame.blogspot.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] How to send Email from Lazarus program under Linux x86-64
2013/3/24 Paul Breneman list2...@brenemanlabs.com silvioprog wrote: 2013/3/24 reinierolislag...@gmail.com On 24-3-2013 15:19, Donald Ziesig wrote: Hi All! I am trying to implement a program that will send emails to (a subset of) an application-specific roster. I found numerous references to synapse so I downloaded the source which includes a .lpk library (it is several years old). Yep, seems about 3 years old: cd C:\Development\extras\synapse svn log laz_synapse.lpk | more r129 | geby | 2010-07-02 12:46:39 +0200 (vr, 02 jul 2010) | 3 lines - improved MACOS compatibility - workaround for some broken virtual serial ports - Added Lazarus package Has anyone had success in using this library under Linux (x86-64)? Yes. See e.g. fpctwit, which happily runs under Linux. Also, the fpcup Lazarus/fpc updater can install synapse for you, also the synapse trunk version. AFAIK no need to change any synapse files. Please see the wiki page on synapse: http://wiki.lazarus.**freepascal.org/synapsehttp://wiki.lazarus.freepascal.org/synapse I also examined Indy (which I used successfully years ago on Delphi/Borland c++ Builder) but it, too, is obsolete (latest updates seem to be circa 2006) and comes with many, many warnings and caveats. Please see the indy wiki page: ... ah well, you'll be able to find it. It's cross referenced in the synapse page as well IIRC. Is there any other smtp and pop3 code available for Lazarus or will I have to generate my own from scratch? There certainly is. IIRC, LazSolutions has code for sending email. Synapse comes with an email example, or has it in the examples directory on their site. Code for sending email using synapse is floating around on e.g. the synapse mailing list... Good luck, Reinier Thanks for the indication Reinier! :) Meet the XMailer also: https://github.com/silvioprog/**xmailerhttps://github.com/silvioprog/xmailer XMailer is a nice plugin for send e-mails easily. It's improved derivation of LSSendMail. :) (it use Synapse too, and offers support to UTF-8) Thanks Silvio. Now I need to try and update this code: http://www.turbocontrol.com/**easyemail.htmhttp://www.turbocontrol.com/easyemail.htm Very nice! :) XMailer is very simple, and it uses universal unicode. Sending email with XMailer you can open it in any account such as Gmail, Yahoo, Hotmail etc., even if the email has special characters. -- Silvio Clécio My public projects - github.com/silvioprog -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Copy buffer of PWord to TMemoryStream
On 24.03.2013 21:09, Leonardo M. Ramé wrote: On 2013-03-24 20:44:50 +0100, Sven Barth wrote: On 24.03.2013 20:39, Leonardo M. Ramé wrote: Now your lBufSize contains the number of pixels, so only Inc(I, 1) should be correct. And for copying all data at once you now need to use lBufSize * SizeOf(Word) instead. And the for-loop variant would look like this: === code begin === for i := 0 to lBufSize - 1 do lStream.Write(lBuffer[i], SizeOf(Word)); // or lStream.WriteWord(lBuffer[i]); === code end === Yes, the code looks correct, but it still creates the wrong resulting image. If you look at the attachment, the upper image is the result of your last suggestion, while the lower image was created using the while loop I've shown. I'll re-check my drawing function, maybe your code is correct and the problem is on that function. I just noticed that you are still using SizeOf(PWord) in your lStream.Write. This is wrong. You want to copy one Word element (SizeOf(Word)=2) instead of two/four (depending on 32 vs 64 bit SizeOf(PWord) is either 4 or 8). Which is also why your Inc(..., 2) works as you are copying multiple entries at once. Well, this is funny, after re-checking the code, I noted it works if I use this: (1) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(PWord)); But, using SizeOf(Word) doesn't: (2) for I := 0 to lBufSize - 1 do lUnCompressed.Write(lTmpBuff[i], SizeOf(Word)); What I would like to achieve is this: (3) lUnCompressed.WriteBuffer(lTmpBuff^, lBufSize * SizeOf(Word)); But using this, I get the same result of (2). Maybe your problem is indeed in your drawing function. Because the usage of SizeOf(PWord) is definitely wrong if your lBuffer basically contains Word sized pixels after each other. You should currently even get different results depending on whether the application is 32 or 64 bit. Regards, Sven Sven, I can confirm the image display function was wrong. Now I can write all data to the stream at once!. Nice to hear that you found the final problem as well :) Regards, Sven -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] IUnknown and reference counting
On 2013-03-21 17:46, Hans-Peter Diettrich wrote:
Thanks for giving me insight into the crippled implementation of
interfaces in FPC :-]
Sorry, but you seem very confused. The default Interfaces style used
by FPC is the COM-style interfaces. 100% compatible with Delphi. So I
really do not see your problem.
IUnknown IInterface- Exactly the same as Delphi
TInterfacedObject- Exactly the same as Delphi
To use CORBA-style interfaces, you need to explicitly tell the compiled
to do so, via the {$interfaces corba} directive.
I use plenty of projects that use Interfaces, and that code is shared
verbatim between Delphi and FPC. Just take a look at the tiOPF project.
Regards,
- Graeme -
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Re: [Lazarus] IUnknown and reference counting
On 2013-03-21 20:48, Hans-Peter Diettrich wrote: Sven Barth schrieb: On 21.03.2013 21:14, Hans-Peter Diettrich wrote: Sven Barth schrieb: Thanks for giving me insight into the crippled implementation of interfaces in FPC :-] Why crippled? When FPC does not allow to use delegation (implements) together with implementing selected methods, this feature is of no practical use :-( There exists at least a bug report about it: http://bugs.freepascal.org/view.php?id=16531 :) +1 Also the hype about CORBA interfaces looks like mere eye-candy or obfuscation to me. Delphi interfaces require neither COM nor CORBA, they are only open in either direction. But some people don't like the reference counting. They want to use interfaces like in other languages to just define a interface to a class. Since reference counting must be implemented, Why *must* reference counting be implemented when you want to use Interfaces? Many other languages also have interfaces with no reference counting. The CORBA-style interfaces that FPC support also make descendant classes easier to extend. For example // this class is supplied by a 3rd party company. TMyClass = class(TObject) ... end; Now I want to add some functionality to a descendant class in my project, and use interfaces to do it [for whatever reason I see fit]. No problem. TMySuperClass = class(TMyClass, IObserver) private // implement IObserver methods here end; All done! If reference counting interfaces was the only option, I would be forced to implement IUnknown in the TMySuperClass class for what? TMyClass is not a TInterfacedObject descendant, and the 3rd party vendor never had a need for interfaces, so they used the very common TObject base class. I don't need reference counting just to have interfaces support - so based on what you say, reference counting must be forced upon me! And I must do more work in my class by adding IUnknown to the TMySuperClass too. Regards, - Graeme - -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://fpgui.sourceforge.net/ -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
