windows 隨機矩形繪製

標籤：windows   winapi   

windows 隨機矩形繪製

代碼如下

#include<windows.h>void DrawRect (HWND hwnd);int cxClient, cyClient;LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){static TCHAR szAppName[] = TEXT("wndclass by lxy");HWNDhwnd;MSGmsg;WNDCLASSwndclass;//視窗類別初始化wndclass.style= CS_VREDRAW | CS_HREDRAW;wndclass.lpfnWndProc= WndProc;wndclass.cbClsExtra= 0;wndclass.cbWndExtra= 0;wndclass.hbrBackground= (HBRUSH) GetStockObject(WHITE_BRUSH);wndclass.hCursor= LoadCursor(NULL,IDC_ARROW);wndclass.hIcon= LoadIcon(NULL,IDI_APPLICATION);wndclass.hInstance= hInstance;wndclass.lpszClassName= szAppName;wndclass.lpszMenuName= NULL;//註冊視窗類別if (!RegisterClass(&wndclass)){MessageBox(NULL,TEXT("分配視窗類別失敗!"),szAppName,MB_ICONERROR);return 0;}//建立視窗hwnd = CreateWindow(szAppName,TEXT("資訊顯示"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT,NULL, NULL, hInstance, NULL);ShowWindow(hwnd,nCmdShow);UpdateWindow(hwnd);while (TRUE){if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)){if ( msg.message == WM_QUIT)break;TranslateMessage (&msg);DispatchMessage (&msg);}else{DrawRect(hwnd);}}return msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){switch(message){case WM_SIZE:cxClient = LOWORD(lParam);cyClient = HIWORD(lParam);return 0;case WM_DESTROY:PostQuitMessage(message);return 0;}return DefWindowProc(hwnd,message,wParam,lParam);}void DrawRect (HWND hwnd){RECT rect;HDC hdc;HBRUSH hBrush;char szBuffer[20];static long num = 0;int t;if (cxClient == 0 || cyClient == 0)return;t = rand()%cyClient;SetRect (&rect , 100, t, cxClient, t+100);//Sleep(10);hdc = GetDC (hwnd);hBrush = CreateSolidBrush (RGB(rand()%256, rand()%256, rand()%256));FillRect (hdc, &rect, hBrush);num++;TextOut (hdc, 0, 0, szBuffer, wsprintf (szBuffer, "已繪矩形"));TextOut (hdc, 0, 20, szBuffer, wsprintf (szBuffer, "%ld", num));ReleaseDC (hwnd, hdc);DeleteObject (hBrush);}

windows 隨機矩形繪製