将DC保存到bmp

 
HBITMAP CopyDCToBitmap(HDC hDC, LPRECT lpRect)
{
 if(!hDC || !lpRect || IsRectEmpty(lpRect))
  return NULL;
 
 HDC hMemDC; 
 HBITMAP hBitmap, hOldBitmap; 
 int nX, nY, nX2, nY2; 
 int nWidth, nHeight;
 
 nX = lpRect->left;
 nY = lpRect->top;
 nX2 = lpRect->right;
 nY2 = lpRect->bottom;
 nWidth = nX2 - nX;
 nHeight = nY2 - nY;
 
 hMemDC = CreateCompatibleDC(hDC);
 
 hBitmap = CreateCompatibleBitmap(hDC, nWidth, nHeight);
 
 hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
 
 StretchBlt(hMemDC, 0, 0, nWidth, nHeight, hDC, nX, nY, nWidth, nHeight, SRCCOPY);
 
 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
 
 DeleteDC(hMemDC);
 DeleteObject(hOldBitmap);
 
 
 return hBitmap;
}

 
BOOL SaveBmp(HBITMAP hBitmap, const char *pchFileName)
{
 if(!hBitmap || !pchFileName)
  return FALSE;
 
 HDC hDC;
 int iBits; // µ±Ç°·Ö±æÂÊÏÂÿÏóËØËùÕ¼×Ö½ÚÊý
 WORD wBitCount; // λͼÖÐÿÏóËØËùÕ¼×Ö½ÚÊý
 
 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;
 BITMAP Bitmap;   // λͼÊôÐԽṹ
 BITMAPFILEHEADER bmfHdr;   // λͼÎļþÍ·½á¹¹
 BITMAPINFOHEADER bi;   // λͼÐÅϢͷ½á¹¹
 LPBITMAPINFOHEADER lpbi;   // Ö¸ÏòλͼÐÅϢͷ½á¹¹
 HANDLE fh, hDib, hPal, hOldPal = NULL; // ¶¨ÒåÎļþ£¬·ÖÅäÄÚ´æ¾ä±ú£¬µ÷É«°å¾ä±ú
 
 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;
 
 //ΪλͼÄÚÈÝ·ÖÅäÄÚ´æ
 hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));
 lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
 *lpbi = bi;
 
 // ´¦Àíµ÷É«°å 
 hPal = GetStockObject(DEFAULT_PALETTE);
 if (hPal) {
  hDC = ::GetDC(NULL);
  hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);
  RealizePalette(hDC);
 }
 
 // »ñÈ¡¸Ãµ÷É«°åÏÂеÄÏñËØÖµ
 GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
  (LPSTR)lpbi + sizeof(BITMAPINFOHEADER) + dwPaletteSize,
  (BITMAPINFO *)lpbi, DIB_RGB_COLORS);
 
 // »Ö¸´µ÷É«°å 
 if(hOldPal) {
  ::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
  RealizePalette(hDC);
  ::ReleaseDC(NULL, hDC);
 }
 
 // ´´½¨Î»Í¼Îļþ
 fh = CreateFile(pchFileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
  FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
 
 if (fh == INVALID_HANDLE_VALUE)
  return FALSE;
 
 // ÉèÖÃλͼÎļþÍ·
 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;
 
 // дÈëλͼÎļþÍ·
 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
 
 // дÈëλͼÎļþÆäÓàÄÚÈÝ
 WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);
 
 // Çå³ý 
 GlobalUnlock(hDib);
 GlobalFree(hDib);
 CloseHandle(fh);
 
 return TRUE;
}

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