VFP使用柯达控件控制扫描仪，解决导出文件体积过大的问题

Function saveimage2(openfile As String,savefile As String)

   lqEncoderClsID_BMP=0h00F47C55041AD3119A730000F81EF32E &&BMP
   lqEncoderClsID_JPG=0h01F47C55041AD3119A730000F81EF32E &&JPG
   lqEncoderClsID_GIF=0h02F47C55041AD3119A730000F81EF32E &&GIF
   lqEncoderClsID_TIF=0h05F47C55041AD3119A730000F81EF32E &&TIF
   lqEncoderClsID_PNG=0h06F47C55041AD3119A730000F81EF32E &&PNG
   Declare Long GdipLoadImageFromFile In GDIPlus.Dll String cFile, Long @ nativeImage
   Declare Long GdipSaveImageToFile In GDIPlus.Dll Long nativeImage, String cFile, ;
      String EncoderClsID, String EncoderParameters
   Declare Long GdipDisposeImage In GDIPlus.Dll Long nativeImage
   lcInputFile=Strconv(openfile+Chr(0),5)
   lcOutputFile=Strconv(savefile+Chr(0),5)
   lnImage=0
   GdipLoadImageFromFile(lcInputFile,@lnImage)
   GdipSaveImageToFile(lnImage, lcOutputFile, Evaluate('lqEncoderClsID_'+Upper(Justext(savefile))), Null)
   GdipDisposeImage(lnImage)
   Erase &openfile
Endfunc