Windows程序设计 RndRctMT（源代码）.rar

/*------------------------------------------ RNDRCTMT.C -- Displays Random Rectangles (c) Charles Petzold, 1998 ------------------------------------------*/ #include <windows.h> #include <process.h> LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; HWND hwnd ; int cxClient, cyClient ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("RndRctMT") ; MSG msg ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("Random Rectangles"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL) ; ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ; } VOID Thread (PVOID pvoid) { HBRUSH hBrush ; HDC hdc ; int xLeft, xRight, yTop, yBottom, iRed, iGreen, iBlue ; while (TRUE) { if (cxClient != 0 || cyClient != 0) { xLeft = rand () % cxClient ; xRight = rand () % cxClient ; yTop = rand () % cyClient ; yBottom = rand () % cyClient ; iRed = rand () & 255 ; iGreen = rand () & 255 ; iBlue = rand () & 255 ; hdc = GetDC (hwnd) ; hBrush = CreateSolidBrush (RGB (iRed, iGreen, iBlue)) ; SelectObject (hdc, hBrush) ; Rectangle (hdc, min (xLeft, xRight), min (yTop, yBottom), max (xLeft, xRight), max (yTop, yBottom)) ; ReleaseDC (hwnd, hdc) ; DeleteObject (hBrush) ; } } } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_CREATE: _beginthread (Thread, 0, NULL) ; return 0 ; case WM_SIZE: cxClient = LOWORD (lParam) ; cyClient = HIWORD (lParam) ; return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; }