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copied!<p>I have made your code work. Basically what I do when using the WNDCLASS (or WNDCLASSEX) structure is use all parameters to be sure not to miss something. </p> <pre><code>//Include the windows header #include <Windows.h> //Forward declaration of the WndProc function LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); //Main entry point int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow) { //Window class name const wchar_t windowName[] = L"Window Class"; //Set up window class WNDCLASS wnd; wnd.cbClsExtra = 0; wnd.cbWndExtra = 0; wnd.hCursor = LoadCursor(0, IDC_ARROW); wnd.hIcon = LoadIcon(0, IDI_WINLOGO); wnd.lpszMenuName = 0; wnd.style = 0; wnd.hbrBackground = 0; wnd.lpfnWndProc = WndProc; wnd.hInstance = hInstance; wnd.lpszClassName = windowName; //Register window class RegisterClass(&wnd); //Create window //! This returns NULL HWND hWnd = CreateWindowEx( 0, windowName, L"Windows Programming", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL ); //Simple check to see if window creation failed if(hWnd == NULL) { //Pause system("PAUSE"); return -1; } //Show the window ShowWindow(hWnd, nCmdShow); //Main message loop MSG msg; while(GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } } //WndProc function LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_PAINT: { PAINTSTRUCT ps; HDC hDc = BeginPaint(hWnd, &ps); FillRect(hDc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW + 1)); EndPaint(hWnd, &ps); return 0; } case WM_DESTROY: { PostQuitMessage(0); return 0; } } return DefWindowProc(hWnd, msg, wParam, lParam); } </code></pre>

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