把HBITMAP 保存图片文件.

 //VC下把HBITMAP保存为bmp图片
 BOOL  CtestBitMapDlg::SaveBmp(HBITMAP  hBitmap,   CString  FileName)
 {
     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=,   dwBmBitsSize=,   dwDIBSize=,   dwWritten=;
     //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;   

     int aa = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +  *  *  / ;

     //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 <=  )
         wBitCount = ;
     else  if(iBits <=  )
         wBitCount  = ;
     else if(iBits <=  )
         wBitCount  = ;
     else
         wBitCount  = ;             

     GetObject(hBitmap,   sizeof(Bitmap),   (LPSTR)&Bitmap);
     bi.biSize= sizeof(BITMAPINFOHEADER);
     bi.biWidth = Bitmap.bmWidth;
     bi.biHeight =  Bitmap.bmHeight;
     bi.biPlanes =  ;
     bi.biBitCount = wBitCount;
     bi.biCompression= BI_RGB;
     bi.biSizeImage = Bitmap.bmWidth * Bitmap.bmHeight * ;
     bi.biXPelsPerMeter = ;
     bi.biYPelsPerMeter = ;
     bi.biClrImportant = ;
     bi.biClrUsed =  ;         

     dwBmBitsSize  = ((Bitmap.bmWidth *wBitCount+) / )** 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, ,(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,,   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  = ;
     bmfHdr.bfReserved2  = ;
     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;
 }