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Window programming question

MetalicFog · 2001-03-20T16:56:28

I am writing a test window program that does not use winmain. Instead I use regular main and get handle to the window instance using function call "GetModuleHandle(NULL)". It seems to be working since I get a window. However when I insert GetLastError at various place I get an error messages "System could not find the file specified" during RegisterClass call. The reason I'm trying to write window program like this is because I can use regular iostream to write to the console. I'm concerned if what I'm doing is working by accident. Can anyone comment on this? Thanks. Below is a code snippet; int Create(HINSTANCE hInstance) { WNDCLASS wndclass; extern LONG WINAPI EventHandler(HWND, UINT, WPARAM, LPARAM); cerr << "--- Create called" << endl; /* Register the frame class */ wndclass.style = 0; wndclass.lpfnWndProc = (WNDPROC)(WndProc); wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon (hInstance, szAppName); wndclass.hCursor = LoadCursor (NULL,IDC_ARROW); wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wndclass.lpszMenuName = szAppName; wndclass.lpszClassName = szAppName; if (!RegisterClass (&wndclass) ) return FALSE; ErrorProcessor("RegisterClass", GetLastError()); m_hWnd = CreateWindow ( szAppName, "Pong", WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, CW_USEDEFAULT, CW_USEDEFAULT, m_width, m_height, NULL, NULL, hInstance, NULL); ErrorProcessor("CreateWindow", GetLastError()); return (m_hWnd ? TRUE : FALSE); } int Run() { MSG msg; cerr << "--- Run called" << endl; if (m_hWnd) { ShowWindow (m_hWnd, SW_SHOW); ErrorProcessor("ShowWindow", GetLastError()); UpdateWindow (m_hWnd); ErrorProcessor("UpdateWindow", GetLastError()); } int done = FALSE; while (!done) { if (PeekMessage(&msg, m_hWnd, 0, 0, PM_REMOVE) == TRUE) { ErrorProcessor("PeekMessage == TRUE", GetLastError()); if (msg.message == WM_QUIT) { done = TRUE; } else { TranslateMessage(&msg;; ErrorProcessor("TranslateMessage", GetLastError()); DispatchMessage(&msg;; ErrorProcessor("DispatchMessage", GetLastError()); } } else { ErrorProcessor("PeekMessage == FALSE", GetLastError()); } } ErrorProcessor("End of Run", GetLastError()); return msg.wParam; } int main() { ErrorProcessor("main", GetLastError()); Create(GetModuleHandle(NULL)); ErrorProcessor("main after Create", GetLastError()); Run(); ErrorProcessor("main", GetLastError()); return 0; } Edited by - MetalicFog on March 18, 2001 2:13:31 AM

General and Gameplay Programming Programming

Started by MetalicFog March 18, 2001 01:11 AM

9 comments, last by MetalicFog 23 years, 1 month ago

MetalicFog

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March 20, 2001 04:56 PM

WinMain is not mapped to main. CRT calls winmain instead of main if the app is defined as GUI app. It checks to see if the app is gui or console and switches between main and winmain. It appears only difference is that call to winmain calls GetModuleHandle(NULL) first.

Window programming question

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Window programming question

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