[fpc-pascal] SimpleIPC examples in docs

[noreply]

I thought I remember some simpleipc examples in the documentation a 
while ago (years ago)..


Can't seem to find them in the current docs.

Were they moved elsewhere or did I miss finding them?

For what I need I will probably not be  using any lazarus components, 
but rather ipc without LCL involved. There are indeed lazarus examples 
kicking around.


The fpc documentation has:

[Overview][Resource 
strings][Constants][Types][Classes][Variables][Index]


Maybe an [Examples] would be a handy link, but some examples are hidden 
away in specific pages. Could index all the examples I suppose, with 
fpdoc tool, but not sure if that would be useful to people. Or there 
could already be an examples feature in the docs that I don't know 
about.

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[fpc-pascal] simpleIPC strings

[noreply]

With simpleipc you can send a string.

I am wondering what type of string is safe to send?

i.e. what happens with utf8 or unicode?

Is it meant to send a regular string (like a pointer to char) and not 
more complex strings? Both?


Because if a string is being sent across two different separate 
processes (exe's) and possibly in different programming languages (when 
I make simpleipc DLL) it will be handy to know what exact type of string 
this communication is meant for: english characters, unicode,  utf8, all 
of the above.

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Re: [fpc-pascal] Record operator for assignment

[Ryan Joseph]

> On May 8, 2017, at 10:47 AM, nore...@z505.com wrote:
> 
> It's always easier said than done, to say "Why can't" and then have to write 
> the actual parser code to do it ;-)

Yes indeed. I just looked over svn to see where Sven added his new dynamic 
array initializers and I’m still totally confused. It’s really a miracle anyone 
is able to contribute to such a large code base without any documentation.

Since we have record constructors and static class functions for records now it 
seems like the language is going out of its way to provide the simplest 
solution.

Yeah Golang has the same thing: c := Circle{x: 0, y: 0, r: 5} and basically the 
same syntax as Pascal or Swift.

Regards,
Ryan Joseph

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Re: [fpc-pascal] Threading vs Parallelism ?

[noreply]

On 2017-05-05 14:27, Brian wrote:

Affinity

If a thread is dedicated to say , polling a serial or Ethernet port 
which
has a high input data rate , then dedicating one CPU to that 
task/thread is

useful.



Isn't the speed of serial (so slow) that it would be overkill to 
dedicate a Cpu to it?


Maybe usb 2 or 3, or possibly Gigabyte ethernet 1000 speed ;-)

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Re: [fpc-pascal] Vehicle management

[Paul Breneman]

On 05/07/2017 11:11 PM, nore...@z505.com wrote:

On 2017-05-07 13:33, Mark Morgan Lloyd wrote:

Has anybody used FPC to talk to a vehicle via the OBD connector?

Can anybody give me a quick summary of the position of FPC on Android
etc.? (Graeme, that includes FPCgui if it's relevant).

We've been caught short by a vehicle problem that appears to be only
fixable by a VB.NET program. However it's GPLed and we're trying to
lean on the (reluctant) author for the source, it would be a natural
to transcribe to e.g. a tablet or possibly a bratphone.



I was looking in to this idea too. The only sources I found was some
plain C or some kind of C code on sourceforge, which could (painfully)
be converted or at least derived from to get ideas for FPC.

The downside is that this did not work on a windows Tablet, it has some
GUI issues that doesn't work right on a tablet, but works fine on a
desktop pc.

Can't remember the name of the software and don't remember what
platforms it ran on.. maybe could find it by going to
https://www.google.ca/search?q=obd+sourceforge

But there is also github... But as for FPC code or lazarus code? I have
no idea. Would be interesting to know.


www.ctrlterm.com (fpGUI) works *very* well on a Windows 8.1 tablet with 
no extra worked needed for the touch screen!


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Re: [fpc-pascal] machine readable grammar of object pascal?

[noreply]

On 2017-05-03 06:49, Peter wrote:

On 03/05/17 00:53, Marc Santhoff wrote:

Hi,

for playing around I would need a grammar of Object Pascal. I do not
care for which tool it is written or at best if it is plain EBNF.

Does such grammar exist?

TIA,
Marc




I found grammar for Delphi once.
Trying to attach it.




Which version? Delphi 5? 4? 7?

There is really no such thing as "delphi" language since there are more 
than 10 versions of it ;-)


But to find even a subset, would be handy.
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Re: [fpc-pascal] Record operator for assignment

[noreply]

On 2017-04-28 01:01, Ryan Joseph wrote:
On Apr 28, 2017, at 12:43 PM, Sven Barth via fpc-pascal 
 wrote:


It would introduce an ambiguity as "(x" could also complete to other 
expressions (e.g. "(x + y) * 2" or even merely "(x)"). Especially 
older Pascal compilers were geared towards the simplicity of the 
language and thus they didn't add it. For FPC it simply never came up.


I never thought about it either until I saw some c++ code doing it.
Despite having overlooked it, it’s basically a built in record
constructor that’s been in the language since forever.


You can also look into GoLang for struct ideas, as golang is simpler 
than C++



rec := (x: (x + y) * 2; y: 0; z: 0);

Why can’t everything between : and ; just be treated like a normal
assignment? “x” is already defined but it’s just a label and not part
of the assignment.



It's always easier said than done, to say "Why can't" and then have to 
write the actual parser code to do it ;-)


I think fpc is based on wirth's simplicity, and even wirth's languages 
probably did not have the ability to setup a record initially with 
default record as another poster said. I do like this feature a lot , 
but can see why a minimalist like worth would avoid it.


It's similar to this feature:

x,y,z := 1, 12, 7

It's neat to be able to assign multiple variables on a single line. But 
necessary? mandatory?
Again, could look into golang for ideas.. may have something like it 
too, without becoming a large C++ mammoth.


In fact that's how golang's error checking works.
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[fpc-pascal] simpleIPC for all programming languages ?

[noreply]

I was thinking, that I need a way to use IPC (inter process 
communication) in all languages, so for example I could compile a plain 
C exe, Delphi exe, Rust exe, Nimrod exe, or GoLang exe and communicate 
back with fpc (very powerful idea). But simpleIPC is only available for 
FPC/lazarus, not other tools, so really it's only good for fpc to fpc 
communication. But the whole point of IPC is that it's general purpose 
for any exe/elf.


So rather than rewrite simpleIPC in every language out there, (big waste 
of time), why not just load SimpleIPC.dll where the fpc compiled dll 
contains simpleipc functions? Any programming language that can load a 
DLL (virtually all languages these days) can now use simpleIPC. Each 
program that wants to use ipc, simply loads the simple ipc dll written 
in fpc.


So this way delphi could communicate with fpc/lazarus programs, golang 
could communicate, nimrod, rust, c, c++, etc.


Then I would create a simpleIPC website advertising this idea, as an 
alternative to say ZeroMQ.


Then some small questions arise: is it possible to statically link fpc 
code into other programs rather than it being a DLL? for example .a 
files instead of a dll at runtime? Then theoretically, IPC could be 
linked in statically, not just as a dll.


Indeed the dll functions will need to be flattened out (non object 
oriented) so all languages can use IPC, but that's not a problem for me 
- simply I write some wrappers around SimpleIPC objects and make them 
plain C/pascal like procedures, which is not so hard.


I have forgotten if fpc can generate .a files to statically link? I know 
it can link in AFAIK .a static files, for example sqlite? But the other 
way around: fpc generating static .a files?  This is not mandatory for 
this idea to work, just would be interesting to know, as an alternative 
to a run time loaded IPC dll.

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Re: [fpc-pascal] Translation C to Pascal

[noreply]

On 2017-05-02 18:49, Marc Santhoff wrote:

On Di, 2017-05-02 at 08:33 -0700, fredvs wrote:

Hello.

The best (IMHO) is c2pas32 --> 
http://www.astonshell.com/freeware/c2pas32/


Nice program, i fed the adc.c source from STMs fwlib for stm32f4 
through
and the generated code looks fine. There is some guessing on type 
casts,

but I hope those can be cleared using simple scripting or the like.


There was also a mailing list thread about this a few weeks/months ago, 
where I was discussing the idea with a few other people on the list.


Another idea is to link in C source as .a files into your fpc program? 
If you want to write wrappers around the C code and use the C code 
directly as .a files from gcc generated...


But depends.. what you need.
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Re: [fpc-pascal] machine readable grammar of object pascal?

[noreply]

On 2017-05-03 04:37, Michael Van Canneyt wrote:

On Wed, 3 May 2017, denisgolovan wrote:


On 2017-05-03 00:53, Marc Santhoff wrote:

 Does such grammar exist?


Well, it depends on what you are trying to solve.
If you want to parse Pascal using FPC - that's one way. If you want to 
get some king of AST using any available [command-line] tools - that's 
another one.


Talking about latter - I would take LPEG (Lua+PEG) and create a parser 
myself. It comes quite simple and intuitive (contrary to 
LL,LR,LALR,...).

Most of Object Pascal is done right (minus sets/open arrays),


Add generics to the 'minus' list.


Does it take into account little bizarre things like writable consts 
(assignable consts)


like

const
  i: integer = 0;

which is like a variable, but called a const ;-)
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Re: [fpc-pascal] machine readable grammar of object pascal?

[noreply]

On 2017-05-02 18:53, Marc Santhoff wrote:

Hi,

for playing around I would need a grammar of Object Pascal. I do not
care for which tool it is written or at best if it is plain EBNF.

Does such grammar exist?



The issue is that there is no object pascal, or in other words, there's 
about 5 million different versions of it.

Delphi 5 is different than delphi 6, 7, 8, as things keep changing...

It's not like Plain C which stays mostly the same.

So in order to get a grammar, you'd need to only include a subset of 
object pascal in a certain version.


Delphi 5 compatibility would be a good candidate (subset)... as it is a 
fairly small language or subset (well, no, actually it's Big like Ada..) 
but would not include generics and all the other features of object 
pascal.


This is one of the biggest issues object pascal faces is that it is not 
very standard and keeps changing, but C++ is very similar to this, 
despite supposed standards existing

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Re: [fpc-pascal] Vehicle management

[noreply]

On 2017-05-07 13:33, Mark Morgan Lloyd wrote:

Has anybody used FPC to talk to a vehicle via the OBD connector?

Can anybody give me a quick summary of the position of FPC on Android
etc.? (Graeme, that includes FPCgui if it's relevant).

We've been caught short by a vehicle problem that appears to be only
fixable by a VB.NET program. However it's GPLed and we're trying to
lean on the (reluctant) author for the source, it would be a natural
to transcribe to e.g. a tablet or possibly a bratphone.



I was looking in to this idea too. The only sources I found was some 
plain C or some kind of C code on sourceforge, which could (painfully) 
be converted or at least derived from to get ideas for FPC.


The downside is that this did not work on a windows Tablet, it has some 
GUI issues that doesn't work right on a tablet, but works fine on a 
desktop pc.


Can't remember the name of the software and don't remember what 
platforms it ran on.. maybe could find it by going to

https://www.google.ca/search?q=obd+sourceforge

But there is also github... But as for FPC code or lazarus code? I have 
no idea. Would be interesting to know.


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Re: [fpc-pascal] Vehicle management

[Paul Breneman]

On 05/07/2017 02:33 PM, Mark Morgan Lloyd wrote:

Has anybody used FPC to talk to a vehicle via the OBD connector?

Can anybody give me a quick summary of the position of FPC on Android
etc.? (Graeme, that includes FPCgui if it's relevant).

We've been caught short by a vehicle problem that appears to be only
fixable by a VB.NET program. However it's GPLed and we're trying to lean
on the (reluctant) author for the source, it would be a natural to
transcribe to e.g. a tablet or possibly a bratphone.



Last year I used www.CtrlTerm.com to talk to OBD using one of these boards:
  https://www.sparkfun.com/products/10769

There are links to the "ELM327 Command Set" near the bottom of those pages.

The best site for the OBD codes that I found is:
  www.autocodes.com

Please update us with what you end up doing.

Regards
Paul
www.ControlPascal.com

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Re: [fpc-pascal] silly question

[duilio foschi]

I got stuck with the symlinks.

The level of indirection is rather complex.

Finally I

1. reinstalled v. 2.6.2 from scratch
2. copied directory zeosdbo from server A to server B
3. copied file /etc/fpc.cfg from server A to server B

now (finally!) everything works as expected.

Thank you

Peppe

2017-05-07 17:13 GMT+02:00 Michael Van Canneyt :
>
>
> On Sun, 7 May 2017, duilio foschi wrote:
>
>> I am have FPC v. 2.6.2 installed on linux/ubuntu server A.
>>
>> I am sure I did some change to zeos library in server A, but I cannot
>> remember details.
>>
>> I'd like to have the same version of FPC installed on a new
>> linux/ubuntu server B.
>>
>> I found that  FPC v. 3.0.2 was already installed on server B.
>>
>> Using my poor skills in linux, I took the following steps:
>>
>> 1. deleted directory /usr/lib/fpc/3.0.2 of server B
>
>
> That was not necessary. You can perfectly have 2 versions of FPC
> co-existing.
>
>> 2. copied directory /usr/lib/fpc/2.6.2 of server A into server B (used
>> scp)
>>
>> Now a few strange things happen:
>>
>> a. if I try to run fpc from - say - /usr/lib/cgi-bin , I get the message
>> Error: ppcx64 can't be executed, error message: Failed to execute
>> "ppcx64", error code: 127
>
>
> Did you correct the symlink /usr/bin/ppcx64 ? it should point to
> /usr/lib/fpc/2.6.2/ppcx64
>
>
>>
>> b. if I try to run fpc from /usr/lib/fpc/2.6.2, a lot of Zeos lib
>> units are compiled EVERY TIME. This for sure was not happening before
>> (see below).
>>
>> I did something silly, right ?
>
>
> Ill-advised, perhaps.
>
>
>> Any help in order to fix the install ?
>
>
> The above should help you to get things compiling again.
>
> About recompilation of zeos units; 2.6.2 may work differently to 3.0.2
> regarding circular units which causes a recompile. Or the zeeos units in
> your search path are the old ones.
>
> Michael.
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[fpc-pascal] Vehicle management

[Mark Morgan Lloyd]

Has anybody used FPC to talk to a vehicle via the OBD connector?

Can anybody give me a quick summary of the position of FPC on Android 
etc.? (Graeme, that includes FPCgui if it's relevant).


We've been caught short by a vehicle problem that appears to be only 
fixable by a VB.NET program. However it's GPLed and we're trying to lean 
on the (reluctant) author for the source, it would be a natural to 
transcribe to e.g. a tablet or possibly a bratphone.


--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]
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Re: [fpc-pascal] silly question

[Michael Van Canneyt]

On Sun, 7 May 2017, duilio foschi wrote:


I am have FPC v. 2.6.2 installed on linux/ubuntu server A.

I am sure I did some change to zeos library in server A, but I cannot
remember details.

I'd like to have the same version of FPC installed on a new
linux/ubuntu server B.

I found that  FPC v. 3.0.2 was already installed on server B.

Using my poor skills in linux, I took the following steps:

1. deleted directory /usr/lib/fpc/3.0.2 of server B


That was not necessary. 
You can perfectly have 2 versions of FPC co-existing.



2. copied directory /usr/lib/fpc/2.6.2 of server A into server B (used scp)

Now a few strange things happen:

a. if I try to run fpc from - say - /usr/lib/cgi-bin , I get the message
Error: ppcx64 can't be executed, error message: Failed to execute
"ppcx64", error code: 127


Did you correct the symlink /usr/bin/ppcx64 ? it should point to
/usr/lib/fpc/2.6.2/ppcx64




b. if I try to run fpc from /usr/lib/fpc/2.6.2, a lot of Zeos lib
units are compiled EVERY TIME. This for sure was not happening before
(see below).

I did something silly, right ?


Ill-advised, perhaps.



Any help in order to fix the install ?


The above should help you to get things compiling again.

About recompilation of zeos units; 2.6.2 may work differently to 3.0.2
regarding circular units which causes a recompile. Or the zeeos units in
your search path are the old ones.

Michael.
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[fpc-pascal] silly question

[duilio foschi]

I am have FPC v. 2.6.2 installed on linux/ubuntu server A.

I am sure I did some change to zeos library in server A, but I cannot
remember details.

I'd like to have the same version of FPC installed on a new
linux/ubuntu server B.

I found that  FPC v. 3.0.2 was already installed on server B.

Using my poor skills in linux, I took the following steps:

1. deleted directory /usr/lib/fpc/3.0.2 of server B
2. copied directory /usr/lib/fpc/2.6.2 of server A into server B (used scp)

Now a few strange things happen:

a. if I try to run fpc from - say - /usr/lib/cgi-bin , I get the message
Error: ppcx64 can't be executed, error message: Failed to execute
"ppcx64", error code: 127

b. if I try to run fpc from /usr/lib/fpc/2.6.2, a lot of Zeos lib
units are compiled EVERY TIME. This for sure was not happening before
(see below).

I did something silly, right ?

Any help in order to fix the install ?

Thank you

Peppe

root@web:/usr/lib/fpc/2.6.2# fpc 106693.pp
Compiling 106693.pp
Free Pascal Compiler version 2.6.2-8 [2014/01/22] for x86_64
Copyright (c) 1993-2012 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling 106693.pp
Compiling ./zeosdbo/component/ZConnection.pas
Compiling ./zeosdbo/component/ZAbstractConnection.pas
Compiling ./zeosdbo/dbc/ZDbcDbLib.pas
Compiling ./zeosdbo/dbc/ZDbcConnection.pas
Compiling ./zeosdbo/core/ZClasses.pas
Compiling ./zeosdbo/core/ZMessages.pas
Compiling ./zeosdbo/core/ZCompatibility.pas
ZCompatibility.pas(426,33) Warning: Some fields coming after "ZAlias"
weren't initialized
ZCompatibility.pas(431,28) Warning: Some fields coming before
"ClientCodePage" weren't initialized
ZCompatibility.pas(457,10) Warning: Some fields coming after
"WriteFormatSettings" weren't initialized
Writing Resource String Table file: ZMessages.rst
Compiling ./zeosdbo/dbc/ZDbcIntfs.pas
Compiling ./zeosdbo/core/ZCollections.pas
Compiling ./zeosdbo/core/ZTokenizer.pas
Compiling ./zeosdbo/core/ZFastCode.pas
ZFastCode.pas(2511,25) Warning: Function result variable does not seem
to initialized
ZFastCode.pas(2573,18) Warning: Function result variable does not seem
to initialized
ZFastCode.pas(2633,18) Warning: Function result variable does not seem
to initialized
ZFastCode.pas(3191,18) Warning: Function result variable does not seem
to initialized
ZFastCode.pas(3246,18) Warning: Function result variable does not seem
to initialized
...


This is what happens when I try to compile a small application in server B
root@KedekUbuntu:/usr/lib/cgi-bin# fpc 106693.pp
Free Pascal Compiler version 2.6.2-8 [2014/01/22] for x86_64
Copyright (c) 1993-2012 by Florian Klaempfl and others
Target OS: Linux for x86-64
Compiling 106693.pp
Linking 106693
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
43 lines compiled, 0.2 sec
root@KedekUbuntu:/usr/lib/cgi-bin#
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Re: [fpc-pascal] Interfaces works in FPC 2.6.4 but not in 3.0.2

[Marcos Douglas B. Santos]

On Sat, May 6, 2017 at 7:37 PM, Graeme Geldenhuys
 wrote:
> var
>   cmd: ICmdLineParams;
> begin
>   if Supports(fpgApplication, ICmdLineParams, cmd) then  //  Never works
>   begin
> ...
>   end;
> end.
>
>
> fpgApplication is a global instance of TfpgApplication.
>
> The line marked with "Never works" never works with FPC 3.0.2, but
> it does with FPC 2.6.4.
>
> Can anybody explain this?

The same here. It did not work neither CORBA nor COM.
I've tried to use the property as public too, but did not work either.

I use delegation by properties a lot, but this haven't broke my code
because I do not use inheritance... but definally this is a bug.

Best regards,
Marcos Douglas
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