屏幕截图

屏幕截图 [VC] 屏幕截图 像红蜻蜓， 还有QQ等，上面的屏幕截图都非常的不错， 那么，如何在自己的程序中加入 这一功能呢,屏幕截图， 实际上就是把屏幕拷贝下来， 然后将其保存到文件或者保存到剪 贴板， 下面的函数，向你展示了这一功能: HBITMAP CopyScreenToBitmap(LPRECT lpRect) { HDC hSrcDC = NULL, hMemDC = NULL; HBITMAP hBitmap = NULL, hOldBitmap = NULL; int x1, y1, x2, y2; int nWidth, nHeight; int xScreen, yScreen; if ( IsRectEmpty(lpRect) ) return NULL; hSrcDC = CreateDC("DISPLAY", NULL, NULL, NULL); hMemDC = CreateCompatibleDC(hSrcDC); x1 = lpRect->left; y1 = lpRect->top; x2 = lpRect->right; y2 = lpRect->bottom; xScreen = GetDeviceCaps(hSrcDC, HORZRES); yScreen = GetDeviceCaps(hSrcDC, VERTRES); if ( x1 < 0 ) x1 = 0; if ( y1 < 0 ) y1 = 0; if ( x2 > xScreen ) x2 = xScreen; if ( y2 > yScreen ) y2 = yScreen; nWidth = x2 - x1; nHeight = y2 - y1; hBitmap = CreateCompatibleBitmap(hSrcDC, nWidth, nHeight); hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); BitBlt(hMemDC, 0, 0, nWidth, nHeight, hSrcDC, x1, y1, SRCCOPY); hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); DeleteDC(hSrcDC); DeleteDC(hMemDC); return hBitmap; } BOOL SaveBitmapToFile(HBITMAP hBitmap, LPCTSTR lpFileName) { HDC hDC = NULL; int iBits = 0; WORD wBitCount = 0; DWORD dwPaletteSize = 0; DWORD dwBmBitsSize = 0, dwDibSize = 0, dwWritten = 0; BITMAP Bitmap; BITMAPFILEHEADER bmfHdr; BITMAPINFOHEADER bi; LPBITMAPINFOHEADER lpbi; HANDLE fh = NULL, hDib = NULL, hPal = NULL, hOldPal = NULL; hDC = CreateDC("DISPLAY", NULL, NULL, NULL); if ( hDC == NULL ) return FALSE; iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES); DeleteDC(hDC); if ( iBits <= 1 ) wBitCount = 1; else if ( iBits <= 4 ) wBitCount = 4; else if ( iBits <= 8 ) wBitCount = 8; else if ( iBits <= 24 ) wBitCount = 24; else if ( iBits <= 32) wBitCount = 32; if ( wBitCount <= 8 ) dwPaletteSize = ( 1 << wBitCount ) * sizeof(RGBQUAD); GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap); bi.biSize = sizeof(BITMAPINFOHEADER); bi.biWidth = Bitmap.bmWidth; bi.biHeight = Bitmap.bmHeight; bi.biPlanes = 1; bi.biBitCount = wBitCount; bi.biCompression = BI_RGB; bi.biSizeImage = 0; bi.biXPelsPerMeter = 0; bi.biYPelsPerMeter = 0; bi.biClrUsed = 0; bi.biClrImportant = 0; dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight; hDib = GlobalAlloc(GHND, dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER)); if ( hDib == NULL ) return FALSE; lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); if ( lpbi == NULL ) { GlobalFree(hDib); return FALSE; } *lpbi = bi; hPal = GetStockObject(DEFAULT_PALETTE); if ( hPal == NULL) { GlobalUnlock(hDib); GlobalFree(hDib); return FALSE; } if ( hPal ) { hDC = GetDC(NULL); hOldPal = (HANDLE)SelectPalette(hDC, (HPALETTE)hPal, FALSE); RealizePalette(hDC); } GetDIBits(hDC, hBitmap, 0, (UINT)Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER) + dwPaletteSize, (BITMAPINFO*)lpbi, DIB_RGB_COLORS); if ( hOldPal ) { SelectPalette(hDC, (HPALETTE)hOldPal, TRUE); RealizePalette(hDC); ReleaseDC(NULL, hDC); } fh = CreateFile(lpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL); if ( fh == INVALID_HANDLE_VALUE ) { GlobalUnlock(hDib); GlobalFree(hDib); return FALSE; } bmfHdr.bfType = 0x4D42; // "BM" dwDibSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize; bmfHdr.bfSize = dwDibSize; bmfHdr.bfReserved1 = 0; bmfHdr.bfReserved2 = 0; bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) + dwPaletteSize; if ( !WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL) ) { GlobalUnlock(hDib); GlobalFree(hDib); return FALSE; } if ( !WriteFile(fh, (LPSTR)lpbi, dwDibSize, &dwWritten, NULL) ) { GlobalUnlock(hDib); GlobalFree(hDib); return FALSE; } GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh); return TRUE; } void SaveToClipbord(HWND hWnd, HBITMAP hBitmap) { if (OpenClipboard(hWnd)) { EmptyClipboard(); SetClipboardData(CF_BITMAP, hBitmap); CloseClipboard(); } }