BITMAPINFOHEADER bmiHeader; //bmp格式头

      LPBITMAPINFO lpBitmapInfo;    //bmp格式具体信息
      int bmpWidth=0;                         //图片宽度
      int bmpHeight = 0;                      //图片高度           

      if(!file.Open(lpszFileName,CFile::modeRead))
              return ;                              //打开文件
      file.Read(&bfhHeader,sizeof(BITMAPFILEHEADER));//读取文件头
      if(bfhHeader.bfType!=((WORD) (''M''<<8)|''B''))           //判断是否是"BM"
              return ;
      if(bfhHeader.bfSize!=file.GetLength())
              return ;
                              
     if (file.Read((LPSTR)&bmiHeader, sizeof(bmiHeader)) != sizeof(bmiHeader))
              return ;
     bmpHeight = bmiHeader.biHeight;//得到高度和宽度
     bmpWidth = bmiHeader.biWidth;
     file.SeekToBegin();
     file.Read(&bfhHeader,sizeof(BITMAPFILEHEADER));
     UINT uBmpInfoLen=(UINT) bfhHeader.bfOffBits-sizeof(BITMAPFILEHEADER);
     lpBitmapInfo=(LPBITMAPINFO) new BYTE[uBmpInfoLen];
     file.Read((LPVOID) lpBitmapInfo,uBmpInfoLen);
     if((* (LPDWORD)(lpBitmapInfo))!=sizeof(BITMAPINFOHEADER))
              return ;
     DWORD dwBitlen=bfhHeader.bfSize - bfhHeader.bfOffBits;
     LPVOID lpSrcBits=new BYTE[dwBitlen];          //将数据读入lpSrcBits数组
     file.ReadHuge(lpSrc