截取屏幕指定区域保存为BMP文件

HBITMAP CopyScreenToBitmap(LPRECT lpRect) { //屏幕和内存设备描述表 HDC hSrcDC, hMemDC; //位图句柄 HBITMAP hBitmap, hOldBitmap; //选定区域坐标 int nX, nY, nX2, nY2; //位图宽度和高度 int nWidth, nHeight; //屏幕分辨率 int xScrn, yScrn;//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 hSrcDC = 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(hSrcDC); //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(hSrcDC, HORZRES); yScrn = GetDeviceCaps(hSrcDC, 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(hSrcDC, 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, hSrcDC, nX, nY, SRCCOPY); //得到屏幕位图的句柄 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) { //屏幕和内存设备描述表 HDC hSrcDC, hMemDC; //位图句柄 HBITMAP hBitmap, hOldBitmap; //选定区域坐标 int nX, nY, nX2, nY2; //位图宽度和高度 int nWidth, nHeight; //屏幕分辨率 int xScrn, yScrn; /* //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 hSrcDC = 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(hSrcDC); //获得选定区域坐标 nX = x1; nY = y1; nX2 = x2; nY2 = y2; //获得屏幕分辨率 xScrn = GetDeviceCaps(hSrcDC, HORZRES); yScrn = GetDeviceCaps(hSrcDC, 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(hSrcDC, 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, hSrcDC, nX, nY, SRCCOPY); //得到屏幕位图的句柄 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("参数错误");return false; }HDC hDC; //当前分辨率下每象素所占字节数 int iBits; //位图中每象素所占字节数 WORD wBitCount; //定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0; //位图属性结构 BITMAP Bitmap; //位图文件头结构 BITMAPFILEHEADER bmfHdr; //位图信息头结构 BITMAPINFOHEADER bi; //指向位图信息头结构 LPBITMAPINFOHEADER lpbi; //定义文件，分配内存句柄，调色板句柄 HANDLE fh, hDib, hPal,hOldPal=NULL;//计算位图文件每个像素所占字节数 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;//为位图内容分配内存 hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER)); lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); *lpbi = bi;// 处理调色板 hPal = GetStockObject(DEFAULT_PALETTE); if (hPal) { hDC = ::GetDC(NULL); hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);RealizePalette(hDC); }// 获取该调色板下新的像素值 GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);//恢复调色板 if (hOldPal) {::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);RealizePalette(hDC); ::ReleaseDC(NULL, hDC); }//创建位图文件 fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);if (fh == INVALID_HANDLE_VALUE) return FALSE;// 设置位图文件头 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; // 写入位图文件头 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL); // 写入位图文件其余内容 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; }

转载于:https://www.cnblogs.com/rogee/archive/2011/04/30/2033401.html

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