正在阅读：VC最常用操作程序20项列举VC最常用操作程序20项列举

void CShowBmpInDlgDlg::OnCutScreen() { ShowWindow(SW_HIDE); RECT r_bmp={0,0,::GetSystemMetrics(SM_CXSCREEN), ::GetSystemMetrics(SM_CYSCREEN)}; HBITMAP hBitmap; hBitmap=CopyScreenToBitmap(&r_bmp); //hWnd为程序窗口句柄 if (OpenClipboard()) { EmptyClipboard(); SetClipboardData(CF_BITMAP, hBitmap); CloseClipboard(); } ShowWindow(SW_SHOW); } HBITMAP CShowBmpInDlgDlg::CopyScreenToBitmap(LPRECT lpRect) { //lpRect 代表选定区域 { HDC hScrDC, hMemDC; // 屏幕和内存设备描述表 HBITMAP hBitmap, hOldBitmap; // 位图句柄 int nX, nY, nX2, nY2; // 选定区域坐标 int nWidth, nHeight; // 位图宽度和高度 int xScrn, yScrn; // 屏幕分辨率 // 确保选定区域不为空矩形 if (IsRectEmpty(lpRect)) return NULL; //为屏幕创建设备描述表 hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); //为屏幕设备描述表创建兼容的内存设备描述表 hMemDC = CreateCompatibleDC(hScrDC); // 获得选定区域坐标 nX = lpRect->left; nY = lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; // 获得屏幕分辨率 xScrn = GetDeviceCaps(hScrDC, HORZRES); yScrn = GetDeviceCaps(hScrDC, VERTRES); //确保选定区域是可见的 if (nX<0) nX = 0; if (nY<0) nY = 0; if (nX2>xScrn) nX2 = xScrn; if (nY2>yScrn) nY2 = yScrn; nWidth = nX2 - nX; nHeight = nY2 - nY; // 创建一个与屏幕设备描述表兼容的位图 hBitmap = CreateCompatibleBitmap (hScrDC, nWidth, nHeight); // 把新位图选到内存设备描述表中 hOldBitmap =(HBITMAP)SelectObject(hMemDC, hBitmap); // 把屏幕设备描述表拷贝到内存设备描述表中 BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY); //得到屏幕位图的句柄 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); //清除 DeleteDC(hScrDC); DeleteDC(hMemDC); // 返回位图句柄 return hBitmap; } }