Re: Wrapping __declspec(dllimport) and __stdcall

Gary Nissen wrote:

> I have an external Windows DLL that I have to wrap that has declarations as 
> such:
>
> __declspec(dllimport) void __stdcall foo(char *)
>
> I cannot find a way to properly handle this sitation.  Here is what I've tried:
>
>
> 1) If I include my header in my wrapper.i file as follows then I receive syntax 
> errors from SWIG
>
> %{
> #include "sample.h"
> %}
>
> %include "sample.h";
>
>
> 2) If I include my header in my wrapper as follows then I receive "redefinition; 
> different type modifiers" on compile.
>
> %{
> #include "sample.h"
> %}
>
> extern void foo(char *);
>
>
> So how can I have external declarations that pass SWIG's syntax check but also 
> generate the proper C wrapper code.  The issue as I see it it that my #2 above 
> will generate declarations that are already defined in the #include and don't 
> match the code.
Number 2) will work. SWIG doesn't need to know about calling conventions, 
whether or not the function is in a DLL and other stuff like that.

Most people do something like this:

// importexport.h
#define DLLIMPORT __declspec(dllimport)

// sample.h file
#include "importexport.h"
DLLIMPORT void __stdcall foo(char *);

This allows you to change DLLIMPORT for import or export the function. Also it 
is very handy for SWIG (which doesn't support this non-ISO feature) as you can 
#define it away:

%{
#include "sample.h"
%}

#define DLLIMPORT
#define __stdcall
%include "sample.h"

William
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