Calling my own dll causes crash.

[monoceres]

Sorry for being needy this last couple of days but I'm just running into problem after problem.

Today I tried to make a dll that would just wrap another function, but it just keeps on crashing

Here's my c++ code:

#include <windows.h>
extern "C" __declspec(dllexport) void _SetPixel(HDC dc,int x, int y, unsigned int color)
{

SetPixel(dc,x,y,color);

}

And here's my autoit code:

#include <GDIPlus.au3>
#include <Winapi.au3>
$hwnd=GUICreate("hello",300,200)
GUISetSTate()


_GDIPlus_Startup()
$graphics=_GDIPlus_GraphicsCreateFromHWND($hwnd)
_GDIPlus_GraphicsClear($graphics,0xFFFFFFFF)
$dc=_GDIPlus_GraphicsGetDC($graphics)
DllCall("GDIplusplus.dll","none","_SetPixel","ptr",$dc,"int",10,"int",10,"dword",0xFF0000)
Do
    $msg=GUIGetMsg()
Until $msg=-3

_GDIPlus_GraphicsReleaseDC($graphics,$dc)
_GDIPlus_GraphicsDispose($graphics)
_GDIPlus_Shutdown()

I can see that the pixel gets painted and everything but right after that it's just a big crash!

Ps. I do know that I could call the Setpixel function like this: DllCall("gdi32.dll", "int", "SetPixel", "ptr", $dc, "int", 10, "int", 10, "dword",0xFF0000)

but I'm after the principle.

[Siao]

See the Remarks of DllCall reference in helpfile. Particularly the paragraph about calling conventions.

[monoceres]

See the Remarks of DllCall reference in helpfile. Particularly the paragraph about calling conventions.

Thanks, I got it working

How do I make a dll that uses stdcall instead?

__stdcall gives me lots of errors in Visual studio 2008..

[SmOke_N]

Thanks, I got it working

How do I make a dll that uses stdcall instead?

__stdcall gives me lots of errors in Visual studio 2008..

Why would you bother with stdcall?

[monoceres]

Why would you bother with stdcall?

I really don't know, but since i never even saw the "Function DllCallint:cdecl" syntax before I figured that stdcall was some sort of standard that would be good to follow or something.

But I really don't know that much about this so I guess I will do fine with cdecl.

[SmOke_N]

I really don't know, but since i never even saw the "Function DllCallint:cdecl" syntax before I figured that stdcall was some sort of standard that would be good to follow or something.

But I really don't know that much about this so I guess I will do fine with cdecl.

I write all mine in cdecl.

[ptrex]

@monoceres

In case you're interested to know the differeces.

Calling conventions on the x86 platform

Regards,

ptrex