Subj : Re: Application written in Delphi and dll written in BCB
To   : borland.public.cpp.borlandcpp
From : macz <mariusz.czarnecki@poczta.fm>
Date : Wed Jan 21 2004 12:03 am





> Dear all,
> 
> I've got application written in Delphi and have to write dll library 
> cooperating with it, but I'm writing this dll using C++ (BCB 5.0 Ent).
> 
> There are routines declared in application as:
>     function func1(PMyInfo Info): integer; stdcall;
>     .
>     .
> 
> PMyInfo is declared there as a pointer to TMyInfo declared as
> 
>   TPartInfo = packed record
>     Name1 : Char32;
>     name2 : Char32;
>     Check1 : boolean;
>     Check2 : boolean;
>     Var1 : double;
>     var2 : double;
>   end;
> 
>   TMyInfo = packed record
>     InfoCount : integer;
>     MyArray : array [0..Count-1] of TPartInfo;
>     Check : boolean;
>   end;
> 
> My questions are as follow:
> 1. Is this correct export routine from my dll if I write it as:
> 
> extern "C" int __stdcall __declspec(dllexport) Funkcja1(PMojeInfo)
> 
>   Is this all I've to do for correct export or do I have to set also 
> Calling convention option in Advanced Compiler page? If yes so which one 
>  of them? Stdcall? Pascal?
> 
> 2. Is #pragma pack(1) directive correct way to fit the same sizes of 
> packed record and equivalent struct declared in my dll? If yes is this 
> enough to use this directive only during type declaration or do I have 
> to use this directive also during defining variables and operating with 
> this variables?
> 
> 3. May I use VCL objects in my dll library?
> 
> Thank's for help in advance.
> 
> P.S. Sorry for my english ;)
> 
> Greetings
> Mariusz
> 


And by the way...
Why can't I debug my dll library running with this application?
(WinXpPro + BCB5.0Ent) + AllUpdates

Mariusz

.