subject:"\[fpc\-devel\] Convert C\+\+ Array\[1\] to FPC"

[fpc-devel] Convert C++ Array[1] to FPC

2008-02-22 Thread Sooky Boo

Please help I am unsure how to port from C++ to fpc this code.
The function this must be passed to says that the structure pointer or size
is invalid.

C++
typedef struct _SSLPROTOCOL {
DWORD dwProtocol;
DWORD dwVersion;
DWORD dwFlags;
} SSLPROTOCOL, FAR *LPSSLPROTOCOL;

typedef struct _SSLPROTOCOLS {
DWORD dwCount;
SSLPROTOCOL ProtocolList[1];   // array of 'count' structures
} SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;

My Attempt FPC Delphi Mode

type  SSLPROTOCOL = record
dwProtocol : DWORD;
dwVersion  : DWORD;
dwFlags: DWORD;
end;
_SSLPROTOCOL = SSLPROTOCOL;
LPSSLPROTOCOL = ^SSLPROTOCOL;

type SSLPROTOCOLS = record
 dwCount :DWORD;
 ProtocolList : array[0..0] of SSLPROTOCOL;   // array of 'count'
structures
end;
 _SSLPROTOCOLS = SSLPROTOCOLS;
 LPSSLPROTOCOLS = ^SSLPROTOCOLS;
 PSSLPROTOCOLS = ^SSLPROTOCOLS;
 
Thanks in advance.
If my port seems correct are there any ideas what could be the problem?
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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-23 Thread ik

{$PACKRECORDS C}
...
 type
LPSSLPROTOCOL = ^SSLPROTOCOL;
SSLPROTOCOL = record
 dwProtocol : DWORD;
 dwVersion  : DWORD;
 dwFlags: DWORD;
 end;
 _SSLPROTOCOL = SSLPROTOCOL;


On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]> wrote:
>
>
> Please help I am unsure how to port from C++ to fpc this code.
> The function this must be passed to says that the structure pointer or size
> is invalid.
>
> C++
> typedef struct _SSLPROTOCOL {
> DWORD dwProtocol;
> DWORD dwVersion;
> DWORD dwFlags;
> } SSLPROTOCOL, FAR *LPSSLPROTOCOL;
>
> typedef struct _SSLPROTOCOLS {
> DWORD dwCount;
> SSLPROTOCOL ProtocolList[1];   // array of 'count' structures
> } SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;
>
> My Attempt FPC Delphi Mode
>
> type  SSLPROTOCOL = record
> dwProtocol : DWORD;
> dwVersion  : DWORD;
> dwFlags: DWORD;
> end;
> _SSLPROTOCOL = SSLPROTOCOL;
> LPSSLPROTOCOL = ^SSLPROTOCOL;
>
> type SSLPROTOCOLS = record
>  dwCount :DWORD;
>  ProtocolList : array[0..0] of SSLPROTOCOL;   // array of 'count'
> structures
> end;
>  _SSLPROTOCOLS = SSLPROTOCOLS;
>  LPSSLPROTOCOLS = ^SSLPROTOCOLS;
>   PSSLPROTOCOLS = ^SSLPROTOCOLS;
>  
> Thanks in advance.
> If my port seems correct are there any ideas what could be the problem?
> ___
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>  http://lists.freepascal.org/mailman/listinfo/fpc-devel
>
>



-- 
http://ik.homelinux.org/
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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-23 Thread Sooky Boo

On 2/23/08, ik <[EMAIL PROTECTED]> wrote:
> {$PACKRECORDS C}
> ...
> type
> LPSSLPROTOCOL = ^SSLPROTOCOL;
> SSLPROTOCOL = record
> dwProtocol : DWORD;
> dwVersion : DWORD;
> dwFlags : DWORD;
> end;
> _SSLPROTOCOL = SSLPROTOCOL;
>
>
> On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]> wrote:
> >
> >
> > Please help I am unsure how to port from C++ to fpc this code.
> > The function this must be passed to says that the structure pointer or
> size
> > is invalid.
> >
> > C++
> > typedef struct _SSLPROTOCOL {
> > DWORD dwProtocol;
> > DWORD dwVersion;
> > DWORD dwFlags;
> > } SSLPROTOCOL, FAR *LPSSLPROTOCOL;
> >
> > typedef struct _SSLPROTOCOLS {
> > DWORD dwCount;
> > SSLPROTOCOL ProtocolList[1]; // array of 'count' structures
> > } SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;
> >
> > My Attempt FPC Delphi Mode
> >
> > type SSLPROTOCOL = record
> > dwProtocol : DWORD;
> > dwVersion : DWORD;
> > dwFlags : DWORD;
> > end;
> > _SSLPROTOCOL = SSLPROTOCOL;
> > LPSSLPROTOCOL = ^SSLPROTOCOL;
> >
> > type SSLPROTOCOLS = record
> > dwCount :DWORD;
> > ProtocolList : array[0..0] of SSLPROTOCOL; // array of 'count'
> > structures
> > end;
> > _SSLPROTOCOLS = SSLPROTOCOLS;
> > LPSSLPROTOCOLS = ^SSLPROTOCOLS;
> > PSSLPROTOCOLS = ^SSLPROTOCOLS;
> >  
> > Thanks in advance.
> > If my port seems correct are there any ideas what could be the problem?
> > ___
> > fpc-devel maillist - fpc-devel@lists.freepascal.org
> > http://lists.freepascal.org/mailman/listinfo/fpc-devel
> >
> >
>
>
>
> --
> http://ik.homelinux.org/
> ___
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>

Unfortunately still doesn't work :(
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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-24 Thread Bram Kuijvenhoven


Sooky Boo wrote:

On 2/23/08, ik <[EMAIL PROTECTED]> wrote:

{$PACKRECORDS C}

On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]> wrote:


Please help I am unsure how to port from C++ to fpc this code.
The function this must be passed to says that the structure pointer or

size

is invalid.

C++

typedef struct _SSLPROTOCOLS {
DWORD dwCount;
SSLPROTOCOL ProtocolList[1]; // array of 'count' structures
} SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;

My Attempt FPC Delphi Mode

type SSLPROTOCOLS = record
dwCount :DWORD;
ProtocolList : array[0..0] of SSLPROTOCOL; // array of 'count' structures
end;


Unfortunately still doesn't work :(


The actual size of the SSLPROTOCOLS struct/record should match the value of 
dwCount. Allocating such a record probably should go like

 LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (dwCount - 1) * 
sizeOf(SSLPROTOCOL)))

Sometimes a dummy record is to be appended at the end of the array, similar to 
the null character at the end of a null-terminated string. In that case it is 
possible that this 'sentinel' record is not counted in dwCount, but you should 
still allocate the space of course. Please refer to the documentation of the 
header file (I hope there is).

I hope this helps.

Regards,

Bram

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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-24 Thread Sooky Boo

I put the function in a for loop and passed I as the size paramater until it
succeeded,

the size of the structure it expects is 40.

40 is equal to  GetMem(sizeOf(SSLPROTOCOLS) + (2) * sizeOf(SSLPROTOCOL));

so

protocols := LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (2) *
sizeOf(SSLPROTOCOL)));

but the size of protocols^ is always 16 no matter what I put in GetMem. (16
is the size of SSLPROTOCOL on its own)
How do I now GetMem for  protocols^.ProtocolList.

//protocols^.ProtocolList := (GetMem((2) * sizeOf(SSLPROTOCOL)));//Error:
Incompatible types: got "Pointer" expected "Array[0..0] Of SSLPROTOCOL"


Thanks

On Sun, Feb 24, 2008 at 12:31 PM, Bram Kuijvenhoven <
[EMAIL PROTECTED]> wrote:

> Sooky Boo wrote:
> > On 2/23/08, ik <[EMAIL PROTECTED]> wrote:
> >> {$PACKRECORDS C}
> >>
> >> On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]> wrote:
> >>>
> >>> Please help I am unsure how to port from C++ to fpc this code.
> >>> The function this must be passed to says that the structure pointer or
> >> size
> >>> is invalid.
> >>>
> >>> C++
> >>>
> >>> typedef struct _SSLPROTOCOLS {
> >>> DWORD dwCount;
> >>> SSLPROTOCOL ProtocolList[1]; // array of 'count' structures
> >>> } SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;
> >>>
> >>> My Attempt FPC Delphi Mode
> >>>
> >>> type SSLPROTOCOLS = record
> >>> dwCount :DWORD;
> >>> ProtocolList : array[0..0] of SSLPROTOCOL; // array of 'count'
> structures
> >>> end;
> >
> > Unfortunately still doesn't work :(
>
> The actual size of the SSLPROTOCOLS struct/record should match the value
> of dwCount. Allocating such a record probably should go like
>
>  LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (dwCount - 1) *
> sizeOf(SSLPROTOCOL)))
>
> Sometimes a dummy record is to be appended at the end of the array,
> similar to the null character at the end of a null-terminated string. In
> that case it is possible that this 'sentinel' record is not counted in
> dwCount, but you should still allocate the space of course. Please refer to
> the documentation of the header file (I hope there is).
>
> I hope this helps.
>
> Regards,
>
> Bram
>
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>
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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-24 Thread Bram Kuijvenhoven

Sooky Boo wrote:
I put the function in a for loop and passed I as the size paramater 
until it succeeded,

the size of the structure it expects is 40.

BTW what is the value of dwCount?

40 is equal to  GetMem(sizeOf(SSLPROTOCOLS) + (2) * sizeOf(SSLPROTOCOL));

Indeed.

so

protocols := LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (2) * 
sizeOf(SSLPROTOCOL)));

but the size of protocols^ is always 16 no matter what I put in GetMem. 
(16 is the size of SSLPROTOCOL on its own)

Well, SSLPROTOCOL has size 12 and SSLPROTOCOLS has size 16. (Note that the 
SSLPROTOCOLS record type holds one DWORD and one SSLPROTOCOL.)

The point is that neither C nor Pascal has a way to declare a record/struct of 
varying size. The compiler itself is not aware of the fact that 
SSLPROTOCOLS.ProtocolList is actually an array of of dwCount items.

But you can still use a trick: allocate a block of memory using GetMem, then 
cast the pointer to the memory block to LPSSLPROTOCOLS ( = ^SSLPROTOCOLS). This 
allows you to interpret the first SizeOf(SSLPROTOCOLS) bytes of the memory 
block as if it is a SSLPROTOCOLS record. Moreover, when range checking is off, 
you can use the syntax

 protocols^.ProtocolList[i]

to access any i-th element (as long as you allocated a memory block that is 
large enough).

How do I now GetMem for  protocols^.ProtocolList.

//protocols^.ProtocolList := (GetMem((2) * 
sizeOf(SSLPROTOCOL)));//Error: Incompatible types: got "Pointer" 
expected "Array[0..0] Of SSLPROTOCOL"

The compiler error tells you precisely what is wrong here. An 'array[0..0] of 
anyThing' is not a pointer type in Pascal (and neither is the 'anyThing[1]' 
type in C). Instead an 'array[0..0] of anyThing' holds room for (and has the 
same size as) one 'anyThing'.

You can't do

 var i:integer;
 ...
 i := GetMem(SizeOf(integer));

but you can do

 var pi:^integer; // pointer to integer
 ...
 pi := ^integer(GetMem(SizeOf(integer)));

Bram

On Sun, Feb 24, 2008 at 12:31 PM, Bram Kuijvenhoven 
<[EMAIL PROTECTED] 
> wrote:

Sooky Boo wrote:
 > On 2/23/08, ik <[EMAIL PROTECTED] > wrote:
 >> {$PACKRECORDS C}
 >>
 >> On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]
> wrote:
 >>>
 >>> Please help I am unsure how to port from C++ to fpc this code.
 >>> The function this must be passed to says that the structure
pointer or
 >> size
 >>> is invalid.
 >>>
 >>> C++
 >>>
 >>> typedef struct _SSLPROTOCOLS {
 >>> DWORD dwCount;
 >>> SSLPROTOCOL ProtocolList[1]; // array of 'count' structures
 >>> } SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;
 >>>
 >>> My Attempt FPC Delphi Mode
 >>>
 >>> type SSLPROTOCOLS = record
 >>> dwCount :DWORD;
 >>> ProtocolList : array[0..0] of SSLPROTOCOL; // array of 'count'
structures
 >>> end;
 >
 > Unfortunately still doesn't work :(

The actual size of the SSLPROTOCOLS struct/record should match the
value of dwCount. Allocating such a record probably should go like

 LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (dwCount - 1) *
sizeOf(SSLPROTOCOL)))

Sometimes a dummy record is to be appended at the end of the array,
similar to the null character at the end of a null-terminated
string. In that case it is possible that this 'sentinel' record is
not counted in dwCount, but you should still allocate the space of
course. Please refer to the documentation of the header file (I hope
there is).

I hope this helps.

Regards,

Bram

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Re: [fpc-devel] Convert C++ Array[1] to FPC

2008-02-24 Thread Sooky Boo

Thanks for all the help already working :),  realized after last email,
getmem allocates enough memory regardless of what sizeof() says.

Hopefully this will help someone in future with the same type of question.

After the function returns (and populates SSLPROTOCOLS) dwCount is
the amount of elements in the array.

Thanks for the useful tricks.

On Sun, Feb 24, 2008 at 5:55 PM, Bram Kuijvenhoven <
[EMAIL PROTECTED]> wrote:

> Sooky Boo wrote:
> > I put the function in a for loop and passed I as the size paramater
> > until it succeeded,
> >
> > the size of the structure it expects is 40.
>
> BTW what is the value of dwCount?
>
> > 40 is equal to  GetMem(sizeOf(SSLPROTOCOLS) + (2) *
> sizeOf(SSLPROTOCOL));
>
> Indeed.
>
> > so
> >
> > protocols := LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (2) *
> > sizeOf(SSLPROTOCOL)));
> >
> > but the size of protocols^ is always 16 no matter what I put in GetMem.
> > (16 is the size of SSLPROTOCOL on its own)
>
> Well, SSLPROTOCOL has size 12 and SSLPROTOCOLS has size 16. (Note that the
> SSLPROTOCOLS record type holds one DWORD and one SSLPROTOCOL.)
>
> The point is that neither C nor Pascal has a way to declare a
> record/struct of varying size. The compiler itself is not aware of the fact
> that SSLPROTOCOLS.ProtocolList is actually an array of of dwCount items.
>
> But you can still use a trick: allocate a block of memory using GetMem,
> then cast the pointer to the memory block to LPSSLPROTOCOLS ( =
> ^SSLPROTOCOLS). This allows you to interpret the first SizeOf(SSLPROTOCOLS)
> bytes of the memory block as if it is a SSLPROTOCOLS record. Moreover, when
> range checking is off, you can use the syntax
>
>  protocols^.ProtocolList[i]
>
> to access any i-th element (as long as you allocated a memory block that
> is large enough).
>
> > How do I now GetMem for  protocols^.ProtocolList.
> >
> > //protocols^.ProtocolList := (GetMem((2) *
> > sizeOf(SSLPROTOCOL)));//Error: Incompatible types: got "Pointer"
> > expected "Array[0..0] Of SSLPROTOCOL"
>
> The compiler error tells you precisely what is wrong here. An 'array[0..0]
> of anyThing' is not a pointer type in Pascal (and neither is the
> 'anyThing[1]' type in C). Instead an 'array[0..0] of anyThing' holds room
> for (and has the same size as) one 'anyThing'.
>
> You can't do
>
>  var i:integer;
>  ...
>  i := GetMem(SizeOf(integer));
>
> but you can do
>
>  var pi:^integer; // pointer to integer
>  ...
>  pi := ^integer(GetMem(SizeOf(integer)));
>
> Bram
>
> > On Sun, Feb 24, 2008 at 12:31 PM, Bram Kuijvenhoven
> > <[EMAIL PROTECTED]
> > > wrote:
> >
> > Sooky Boo wrote:
> >  > On 2/23/08, ik <[EMAIL PROTECTED] >
> wrote:
> >  >> {$PACKRECORDS C}
> >  >>
> >  >> On Sat, Feb 23, 2008 at 5:59 AM, Sooky Boo <[EMAIL PROTECTED]
>  > > wrote:
> >  >>>
> >  >>> Please help I am unsure how to port from C++ to fpc this code.
> >  >>> The function this must be passed to says that the structure
> > pointer or
> >  >> size
> >  >>> is invalid.
> >  >>>
> >  >>> C++
> >  >>>
> >  >>> typedef struct _SSLPROTOCOLS {
> >  >>> DWORD dwCount;
> >  >>> SSLPROTOCOL ProtocolList[1]; // array of 'count' structures
> >  >>> } SSLPROTOCOLS, FAR *LPSSLPROTOCOLS;
> >  >>>
> >  >>> My Attempt FPC Delphi Mode
> >  >>>
> >  >>> type SSLPROTOCOLS = record
> >  >>> dwCount :DWORD;
> >  >>> ProtocolList : array[0..0] of SSLPROTOCOL; // array of 'count'
> > structures
> >  >>> end;
> >  >
> >  > Unfortunately still doesn't work :(
> >
> > The actual size of the SSLPROTOCOLS struct/record should match the
> > value of dwCount. Allocating such a record probably should go like
> >
> >  LPSSLPROTOCOLS(GetMem(sizeOf(SSLPROTOCOLS) + (dwCount - 1) *
> > sizeOf(SSLPROTOCOL)))
> >
> > Sometimes a dummy record is to be appended at the end of the array,
> > similar to the null character at the end of a null-terminated
> > string. In that case it is possible that this 'sentinel' record is
> > not counted in dwCount, but you should still allocate the space of
> > course. Please refer to the documentation of the header file (I hope
> > there is).
> >
> > I hope this helps.
> >
> > Regards,
> >
> > Bram
> >
> > ___
> > fpc-devel maillist  -  fpc-devel@lists.freepascal.org
> > 
> > http://lists.freepascal.org/mailman/listinfo/fpc-devel
> >
> >
> >
> > 
>  >
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>
>
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[fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

Re: [fpc-devel] Convert C++ Array[1] to FPC

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