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IDirectDraw7::SetDisplayMode return E_NOTIMPL?

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My sourse codes: DWORD dwError; WNDCLASSEX wc; DDSURFACEDESC2 ddsd; //Set up Window class wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = WindowProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = LoadIcon(hInstance, "LARGE"); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = GetStockBrush(BLACK_BRUSH); wc.lpszMenuName = NAME; wc.lpszClassName = TITLE; wc.cbSize = sizeof(WNDCLASSEX); wc.hIconSm = LoadIcon(hInstance, "SMALL"); //Register Window class if (!RegisterClassEx(&wc)) { MessageBox( hwnd, "Failed to register window class", TITLE, MB_OK); return InitFail(hwnd); } //Create a window hwnd = CreateWindowEx(WS_EX_TOPMOST, NAME, TITLE, WS_VISIBLE | WS_POPUP, 0, 0, SCREENWIDTH/*GetSystemMetrics(SM_CXSCREEN) / 2*/, SCREENHEIGHT/*GetSystemMetrics(SM_CYSCREEN)/2*/, NULL, NULL, hInstance, NULL); if(!hwnd) { MessageBox( hwnd, "Main window not created", TITLE, MB_OK); return InitFail(hwnd); } //Create DirectDraw object DirectDrawCreateEx(NULL, (void **)&DDObject, IID_IDirectDraw7, NULL ); if(Result != DD_OK) { MessageBox(hwnd, "The DirectDraw Object could not be created", TITLE, MB_OK); return InitFail(hwnd); } //Get exclusive mode Result = DDObject->SetCooperativeLevel( hwnd, DDSCL_NORMAL );// DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN ); dwError = GetLastError(); if(Result != DD_OK) { MessageBox(hwnd, "Could not gain exclusive, fullscreen access", TITLE, MB_OK); return InitFail(hwnd); } //Set the video mode IDirectDraw7::SetDisplayMode Result = DDObject->SetDisplayMode(SCREENWIDTH, SCREENHEIGHT, CLRMODE, 0, 0); dwError = GetLastError(); char szTemp[256]; ::ZeroMemory( szTemp, sizeof( char ) * 256 ); sprintf( szTemp, "[Error]\tError Code£º%d\n", dwError ); OutputDebugString( szTemp ); // // Result = E_NOTIMPL and dwError = 0? why? // if(Result != DD_OK) { MessageBox(hwnd, "Set Display Mode failed", TITLE, MB_OK); return InitFail(hwnd); }

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