DirectDraw get procedure address using GetProcAddress

Question

As stated in the documentation for the IDirectDraw7::SetCooperativeLevel method, it states

You must use LoadLibrary to explicitly link to Ddraw.dll and then use GetProcAddress to access the SetCooperativeLevel method.

in the remarks. However when I attempt to do so (code below), it fails to work. Am I doing something wrong?

typedef HRESULT (*pSetCooperativeLevelFunc)(HWND, DWORD);
HMODULE ddrawLib = LoadLibrary(L"ddraw.dll");
pSetCooperativeLevelFunc SCL = (pSetCooperativeLevelFunc) GetProcAddress(
                                 ddrawLib,
                                 "SetCooperativeLevel"
                                 );

if (SCL == NULL) {
    // this happens
    int error = GetLastError(); // 127 (ERROR_PROC_NOT_FOUND)
    printf("Error getting SetCooperativeLevel function address: %i", error);
}

score 2 · Accepted Answer · answered Mar 29 '12 at 23:50

2

There is no exported SetCooperativeLevel function in ddraw.dll. Use DUMPBIN utility and check it yourself. You can get DirectDrawCreate/DirectDrawCreateEx and similar functions using GetProcAddress, but you can't extract individual methods of COM object.

Article is quite ridiculous and doesn't make sense. Perhaps it was supposed to tell you to get DirectDrawCreate from ddraw.dll or something like that, but there's little reason to do that.

Link with ddraw.lib, call DirectDrawCreate and access methods provided by IDirectDraw7 interface.

P.S. If you aren't familiar with dumpbin, I'd suggest to learn at least basic usage of this utility.

answered Mar 29 '12 at 23:50

SigTerm

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I want to meet the people who write some of these MSDN articles. You got unlucky with the fact that there are no comments at the bottom of it explaining the situation. – chris Mar 30 '12 at 00:42
That's what i thought too, i'll try to learn how to use `DUMPBIN`, thanks. – cplusplus Mar 30 '12 at 00:55
@chris: "people who write some of these MSDN articles." It is actually quite strange. I have impression that roughly 5..7 years ago documentation from MSDN was very good, but then "something" happened, and things started to deteriorate quickly. Now the whole thing is a mess that is hard to navigate and requires google search to get decent results, which is a pity. – SigTerm Mar 30 '12 at 01:54
You can't GetProcAddress for a COM interface's method. But it's worth noting that in recente DX (from 9 on) there's no ddraw.lib any more, so you need to use GetProcAddress to call the functions that ddraw.dll exports, like DirectDrawCreate etc. etc. It's a MSDN documentation bug, they added the remark to every DDraw method. – Gufino2 Mar 15 '15 at 13:40

score 1 · Answer 2 · answered Mar 29 '12 at 23:49

1

I think that's a documentation bug. It's been a long time since I used DirectDraw7, but I don't recall having to load it dynamically. It was just a method of the IDirectDraw7 interface and called like any other method.

answered Mar 29 '12 at 23:49

Adrian McCarthy

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score 0 · Answer 3 · answered Mar 15 '15 at 13:36

Since DX9, ddraw.lib was completely removed from the SDK, so you need to call LoadLibrary/GetProcAddress to call DirectDrawCreate or DirectDrawEnumerate. Unfortunately MSDN got it wrong, and added the GetProcAddress remark to EVERY DirectDraw function, even the COM interfaces' methods.

DirectDraw get procedure address using GetProcAddress

3 Answers3