渐变彩条
//windows.h文件中包含应用程序中所需的数据类型和数据结构的定义 #include<windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//窗口函数说明 //---------以下初始化窗口类-------------- int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow) { HWND hwnd; MSG Msg; WNDCLASS wndclass; char lpszClassName[] = "窗口"; //窗口类名 char lpszTitle[] = "My_Windows"; //窗口标题名 //窗口类的定义 wndclass.style = CS_HREDRAW | CS_VREDRAW; //窗口类型为默认类型 wndclass.lpfnWndProc = WndProc; //窗口处理函数为WndProc wndclass.cbClsExtra = 0; //窗口类无扩展 wndclass.cbWndExtra = 0; //窗口实例无扩展 wndclass.hInstance = hInstance; //当前实例句柄 wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);//窗口的最小化图标为默认图标 wndclass.hCursor = LoadCursor( NULL, IDC_ARROW); //窗口 采用箭头光标 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //窗口 背景为 白色 wndclass.lpszMenuName = NULL ; //窗口 中无菜单 wndclass.lpszClassName = lpszClassName; //窗口类名为“窗口示例” //-----------以下进行窗口类的注册 if (!RegisterClass(&wndclass))//如果注册失败则发出警吿声音 { MessageBeep (0); return FALSE; } //创建窗口 hwnd = CreateWindow( lpszClassName, //窗口类名 lpszTitle, //窗口实例的标题名 WS_OVERLAPPEDWINDOW, //窗口 的风格 CW_USEDEFAULT, CW_USEDEFAULT, //窗口左上角坐标为默认值 CW_USEDEFAULT, CW_USEDEFAULT, //窗口的髙和宽为默认值 NULL, //此窗口无父窗口 NULL, //此窗口无主菜单 hInstance, //创建此窗口应用程序的当前句柄 NULL //不使用该值 ); ShowWindow( hwnd, nCmdShow); //显示窗口 UpdateWindow(hwnd); //绘制用户区 while( GetMessage(&Msg, NULL, 0, 0)) //消息循环 { TranslateMessage(&Msg); DispatchMessage(&Msg); } return Msg.wParam; //程序终止时将信息返回系统 } //窗口函数 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hDC; HBRUSH hBrush; HPEN hPen; RECT rect; PAINTSTRUCT PtStr; POINT pt; switch(message) { case WM_PAINT: hDC = BeginPaint(hWnd, &PtStr); GetClientRect(hWnd, &rect); for (int i = 0; i < 255; i++) { hPen = CreatePen(PS_SOLID, 1, RGB(i,255,0)); SelectObject(hDC, hPen); Rectangle(hDC, 50,50+i,100, 51+i); } for (int j = 0; j < 255; j++) { hPen = CreatePen(PS_SOLID, 1, RGB(255,255-j,0)); SelectObject(hDC, hPen); Rectangle(hDC, 50,305+j,100, 306+j); } DeleteObject(hPen); EndPaint(hWnd, &PtStr); return 0; case WM_DESTROY: PostQuitMessage(0); //调用 PostQuitMessage 发出 WM_QUIT 消息 return 0; default: return DefWindowProc(hWnd, message, wParam, lParam); //默认时采用系统消息默认处理函数 } }