HBITMAP CopyScreenToBitmap(LPRECT lpRect) { //屏幕和內存設備描述表 HDC hSrcDC, hMemDC; //位圖句柄 HBITMAP hBitmap, hOldBitmap; //選定區域坐標 int nX, nY, nX2, nY2; //位圖寬度和高度 int nWidth, nHeight; //屏幕分辨率 int xScrn, yScrn;//確保選定區域不為空矩形 if(IsRectEmpty(lpRect))return NULL; //為屏幕創建設備描述表 hSrcDC = CreateDC("DISPLAY", NULL, NULL, NULL); //為屏幕設備描述表創建兼容的內存設備描述表 hMemDC = CreateCompatibleDC(hSrcDC); //獲得選定區域坐標 nX ＝ lpRect->left; nY = lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; //獲得屏幕分辨率 xScrn = GetDeviceCaps(hSrcDC, HORZRES); yScrn = GetDeviceCaps(hSrcDC, VERTRES); //確保選定區域是可見的 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; //創建一個與屏幕設備描述表兼容的位圖 hBitmap = CreateCompatibleBitmap(hSrcDC, nWidth, nHeight); //把新位圖選到內存設備描述表中 hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); //把屏幕設備描述表拷貝到內存設備描述表中 BitBlt(hMemDC, 0, 0, nWidth, nHeight, hSrcDC, nX, nY, SRCCOPY); //得到屏幕位圖的句柄 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); //清除 DeleteDC(hSrcDC); DeleteDC(hMemDC); //返回位置句柄 } */ HBITMAP CopyScreenToBitmap(int x1, int x2, int y1, int y2) { //屏幕和內存設備描述表 HDC hSrcDC, hMemDC; //位圖句柄 HBITMAP hBitmap, hOldBitmap; //選定區域坐標 int nX, nY, nX2, nY2; //位圖寬度和高度 int nWidth, nHeight; //屏幕分辨率 int xScrn, yScrn; /* //確保選定區域不為空矩形 if(IsRectEmpty(lpRect))return NULL;*/ //為屏幕創建設備描述表 hSrcDC = CreateDC("DISPLAY", NULL, NULL, NULL); //為屏幕設備描述表創建兼容的內存設備描述表 hMemDC = CreateCompatibleDC(hSrcDC); //獲得選定區域坐標 nX = x1; nY = y1; nX2 = x2; nY2 = y2; //獲得屏幕分辨率 xScrn = GetDeviceCaps(hSrcDC, HORZRES); yScrn = GetDeviceCaps(hSrcDC, VERTRES); //確保選定區域是可見的 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; //創建一個與屏幕設備描述表兼容的位圖 hBitmap = CreateCompatibleBitmap(hSrcDC, nWidth, nHeight); //把新位圖選到內存設備描述表中 hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); //把屏幕設備描述表拷貝到內存設備描述表中 BitBlt(hMemDC, 0, 0, nWidth, nHeight, hSrcDC, nX, nY, SRCCOPY); //得到屏幕位圖的句柄 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); //清除 DeleteDC(hSrcDC); DeleteDC(hMemDC); //返回位置句柄 return hBitmap; }BOOL SaveCapturedBitmap(HBITMAP hBitmap, CString FileName) { if(hBitmap==NULL || FileName.IsEmpty()) {AfxMessageBox("參數錯誤");return false; }HDC hDC; //當前分辨率下每象素所占字節數 int iBits; //位圖中每象素所占字節數 WORD wBitCount; //定義調色板大小， 位圖中像素字節大小 ，位圖文件大小 ， 寫入文件字節數 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0; //位圖屬性結構 BITMAP Bitmap; //位圖文件頭結構 BITMAPFILEHEADER bmfHdr; //位圖信息頭結構 BITMAPINFOHEADER bi; //指向位圖信息頭結構 LPBITMAPINFOHEADER lpbi; //定義文件，分配內存句柄，調色板句柄 HANDLE fh, hDib, hPal,hOldPal=NULL;//計算位圖文件每個像素所占字節數 hDC = CreateDC("DISPLAY", NULL, NULL, NULL); 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 wBitCount = 24;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.biClrImportant = 0; bi.biClrUsed = 0;dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;//為位圖內容分配內存 hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER)); lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); *lpbi = bi;// 處理調色板 hPal = GetStockObject(DEFAULT_PALETTE); if (hPal) { hDC = ::GetDC(NULL); hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);RealizePalette(hDC); }// 獲取該調色板下新的像素值 GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);//恢復調色板 if (hOldPal) {::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);RealizePalette(hDC); ::ReleaseDC(NULL, hDC); }//創建位圖文件 fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);if (fh == INVALID_HANDLE_VALUE) return FALSE;// 設置位圖文件頭 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; // 寫入位圖文件頭 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL); // 寫入位圖文件其余內容 WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL); //清除 GlobalUnlock(hDib); GlobalFree(hDib); CloseHandle(fh);return TRUE; }int main() { HBITMAP hCaptureBitmap = CopyScreenToBitmap(100, 700, 100, 700); SaveCapturedBitmap(hCaptureBitmap, "Hello.bmp"); return 0; }

轉載于:https://www.cnblogs.com/rogee/archive/2011/04/30/2033401.html

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