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;

 }