BITBLT贴位图刷新时图象闪烁的问题

关于BITBLT贴位图刷新时图象闪烁的问题 最近尝试了一下用BITBLT贴位图，并在点击鼠标时使图象移动，开始时窗口不能强制重画，现在用了invalidate之后，图象能动了，可是图象闪烁的厉害，请问如何解决，代码如下： #include "Game.h" #include #define MAX_LOADSTRING 100 #define SCREEN_HEIGHT 480 #define SCREEN_WIDTH 640 #define KEYDOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0) #define KEYUP(vk_code)   ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1) int Game_Init(void *parms = NULL, int num_parms = 0); int Game_ShutDown(void *parms = NULL, int num_parms = 0); int Game_Main(void *parms = NULL, int num_parms = 0); iPos iPosSence(0,0); // 全局变量: HINSTANCE hInst; // 当前实例 TCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本 TCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名 HBITMAP hSence; HDC hdcMem,hdc; HWND hWnd; // 此代码模块中包含的函数的前向声明: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY _tWinMain(HINSTANCE hInstance,                      HINSTANCE hPrevInstance,                      LPTSTR    lpCmdLine,                      int       nCmdShow) {   // TODO: 在此放置代码。 MSG msg; HACCEL hAccelTable; // 初始化全局字符串 LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hInstance, IDC_GAME, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // 执行应用程序初始化: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_GAME); Game_Init(); // 主消息循环: while(TRUE) { if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { if (msg.message == WM_QUIT) break; TranslateMessage(&msg); DispatchMessage(&msg); } Game_Main(); Sleep(30); } Game_ShutDown(); return (int) msg.wParam; } // //  函数: MyRegisterClass() // //  目的: 注册窗口类。 // //  注释: // //    仅当希望在已添加到 Windows 95 的 //    “RegisterClassEx”函数之前此代码与 Win32 系统兼容时， //    才需要此函数及其用法。调用此函数 //    十分重要，这样应用程序就可以获得关联的 //   “格式正确的”小图标。 // ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_GAME); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = (LPCTSTR)IDC_GAME; wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_GAME); return RegisterClassEx(&wcex); } // //   函数: InitInstance(HANDLE, int) // //   目的: 保存实例句柄并创建主窗口 // //   注释: // //        在此函数中，我们在全局变量中保存实例句柄并 //        创建和显示主程序窗口。 // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { int xScrn, yScrn,x,y; HDC hScrDC; hInst = hInstance; // 将实例句柄存储在全局变量中 hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); xScrn = GetDeviceCaps(hScrDC, HORZRES); yScrn = GetDeviceCaps(hScrDC, VERTRES); x = (xScrn - SCREEN_WIDTH)/2; y = (yScrn - SCREEN_HEIGHT)/2; hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,       x, y, SCREEN_WIDTH, SCREEN_HEIGHT, NULL, NULL, hInstance, NULL); hSence= LoadBitmap (hInst, MAKEINTRESOURCE(IDB_SENCE)) ; if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } // //  函数: WndProc(HWND, unsigned, WORD, LONG) // //  目的: 处理主窗口的消息。 // //  WM_COMMAND - 处理应用程序菜单 //  WM_PAINT - 绘制主窗口 //  WM_DESTROY - 发送退出消息并返回 // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; switch (message) { case WM_LBUTTONDOWN: iPosSence.x+=10; break; case WM_COMMAND: wmId    = LOWORD(wParam); wmEvent = HIWORD(wParam); // 分析菜单选择: switch (wmId) { case IDM_about: DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_PAINT: break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // “关于”框的消息处理程序。 LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) { EndDialog(hDlg, LOWORD(wParam)); return TRUE; } break; } return FALSE; } int Game_Init(void *parms, int num_parms) { return 0; } int Game_ShutDown(void *parms, int num_parms) { return 0; } int Game_Main(void *parms, int num_parms) { PAINTSTRUCT ps; hdc = BeginPaint(hWnd, &ps); hdcMem = CreateCompatibleDC (hdc) ; SelectObject (hdcMem, hSence) ; BitBlt (hdc, 0,0, SCREEN_WIDTH, SCREEN_HEIGHT, hdcMem, iPosSence.x, iPosSence.y, SRCCOPY) ; DeleteDC( hdcMem ); EndPaint(hWnd, &ps); RECT rctA; rctA.left = 0; rctA.top = 0; rctA.right  = 640; rctA.bottom = 480; ::InvalidateRect(hWnd,&rctA,TRUE); return 0; }