使用twain获得扫描仪的图片问题？

PBITMAPINFOHEADER pDIB = (PBITMAPINFOHEADER)_DSM_LockMemory(hImg);



      if(0 == pDIB)

      {

        printError(m_pDataSource, "App: Unable to lock memory, transfer failed");

        break;

      }



     

      



      // Save the image to disk

      FILE *pFile;

      fopen("d:\\aa", "wb");

      if(pFile == 0)

      {

        return;

      }

      else

      {

        DWORD dwPaletteSize = 0;



        switch(pDIB->biBitCount)

        {

        case 1:

          dwPaletteSize = 2;

          break;

        case 8:

          dwPaletteSize = 256;

          break;

        case 24:

          break;

        default:          

          break;

        }



        // If the driver did not fill in the biSizeImage field, then compute it

        // Each scan line of the image is aligned on a DWORD (32bit) boundary

        if( pDIB->biSizeImage == 0 )

        {

          pDIB->biSizeImage = ((((pDIB->biWidth * pDIB->biBitCount) + 31) & ~31) / 8) * pDIB->biHeight;



          // If a compression scheme is used the result may infact be larger

          // Increase the size to account for this.

          if (pDIB->biCompression != 0)

          {

            pDIB->biSizeImage = (pDIB->biSizeImage * 3) / 2;

          }

        }



        int nImageSize = pDIB->biSizeImage + (sizeof(RGBQUAD)*dwPaletteSize)+sizeof(BITMAPINFOHEADER);



        BITMAPFILEHEADER bmpFIH = {0};

        bmpFIH.bfType = ( (WORD) ('M' << 8) | 'B');

        bmpFIH.bfSize = nImageSize + sizeof(BITMAPFILEHEADER);

        bmpFIH.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+(sizeof(RGBQUAD)*dwPaletteSize);

  

        fwrite(&bmpFIH, 1, sizeof(BITMAPFILEHEADER), pFile);//在这行出现错误

        fwrite(pDIB, 1, nImageSize, pFile);

        fclose(pFile);

        pFile = 0;