Thread: warning: assignment from a incompatible pointer type

This:

Code:

#include <mmsystem.h>
...
MMRESULT (_stdcall *fpMidiOutOpen)(LPHMIDIOUT,unsigned int,unsigned long,unsigned long,unsigned long);
MMRESULT (_stdcall *fpMidiOutShortMsg)(HMIDIOUT, DWORD);
MMRESULT (_stdcall *fpMidiOutClose)(HMIDIOUT);
...
    fpMidiOutOpen=GetProcAddress(hLibrary,"midiOutOpen");
    fpMidiOutShortMsg = GetProcAddress(hLibrary,"midiOutShortMsg");
    fpMidiOutClose= GetProcAddress(hLibrary,"midiOutClose");

Produces "warning: assignment from a incompatible pointer type"

I Googled, and apparently I'm not supposed to point to DWORD or ULONG because of the fixed width? I'm a little lost with pointers.

I found an article that said you should use INT_PTR, UINT_PTR, DWORD_PTR, etc. instead, but that hasn't helped.

Originally Posted by matsp

You probably want to typedef your pointer types - here's some that I made for a MS Cards library, then you cast the result of GetProcAddress to the type you expect.

Code:

typedef bool (__stdcall *CDTInit)(int *width, int *height);
typedef void (__stdcall *CDTTerm)(void);
typedef bool (__stdcall *CDTDraw)(HDC hdc, int x, int y, int index, int style, int color );
...
	cardFuncs.cdtInit = (CDTInit)GetProcAddress(h, "cdtInit");
	cardFuncs.cdtTerm = (CDTTerm)GetProcAddress(h, "cdtTerm");
	cardFuncs.cdtDraw = (CDTDraw)GetProcAddress(h, "cdtDraw");
...

--
Mats

gcc is telling me I can't declare a bool before *

Also, to do this, won't I also then need to declare something like cardFuncs as a structure?

How you declare void cdtTerm in a struct? I thought you couldn't have void in a struct.

what are those codes for . I am wondering.

I tried the following:

Code:

typedef bool (_stdcall *fpMidiOutOpen)(LPHMIDIOUT,unsigned int,unsigned long,unsigned long,unsigned long);
typedef bool (_stdcall *fpMidiOutShortMsg)(HMIDIOUT, DWORD);
typedef bool (_stdcall *fpMidiOutClose)(HMIDIOUT);

Except, gcc threw an error that I could declare bool before *

I've got a fresh install of MinGW, and I have no reason to thing that _stdcall would be somehow screwed up.

Yes I can , what is mmsystem.h library for?