__declspec VERSUS _stdcall

[nhungr]

I'm calling a C++ DLL from another application written in Visual Basic. When declaring a function in the DLL, what's the difference between using __declspec as opposed to _stdcall? For example:

void __declspec(dllexport) CALLBACK MyFunction()

   [COLOR=green]//or:[/color]

void _stdcall MyFunction()

Is one better than the other?

 

[ArkM]

Using of __declspec and __stdcall are ortogonal. Use __declspec(dllexport) to export a (function or variable) name from a dll (w/o another specs in .DEF file).
__stdcall defines calling conventions for its function (only) name (specifies so called Fortran convention).
As far as I know, CALLBACK implies __stdcall.

So __declspec(dllexport) is not better than __stdcall (and vice versa)...

 

[TheGreyBeast]

__declspec(dllexport) is not a calling convention. It just exports the function so executables can use them. It is mainly used in dlls.

__stdcall is a calling convention. See this for related information on Microsoft calling conventions.

 

[IonelBurtan]

for all exported functions from a DLL, that you will use in Visual Basic you HAVE TO put the __stdcall calling convention (the OS code works under this convention, too)

so. you should have BOTH options of them like that:

__declspec(dllexport) void __stdcall foo(int, int, char*);

s-)

Blessed is he who in the name of justice and goodwill, sheperds the weak through the valley of darkness...

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