困惑啊！！用zxing读取图片当中的条形码

请教个问题：一张图片当中在不固定位置包含有条形码，怎么读取条形码出来呢？怎么读取一张图片中的多个条形码？用zxing读取图片当中的条形码，报错com.google.zxing.NotFoundException。有大神知道的吗？谢谢

参考
zxing二维码扫描的流程简析（Android版）
Java Code Examples for com.google.zxing.DecodeHintType
Reading QRCode with Zxing in Java
设置一下TryHarder和PossibleFormats看一下

public static List<string> ScanForBarcodes(string path)
{
  return ScanForBarcodes(new Bitmap(path));
}

public static List<string> ScanForBarcodes(Bitmap bitmap)
{
  // initialize a new Barcode reader.
  BarcodeReader reader = new BarcodeReader
  {
    TryHarder = true, // TryHarder is slower but recognizes more Barcodes
    PossibleFormats = new List<BarcodeFormat> // in the ZXing There is an Enum where all supported barcodeFormats were contained
    {
      BarcodeFormat.CODE_128, 
      BarcodeFormat.QR_CODE,
      //BarcodeFormat. ... ;
    }
  };
  return reader.DecodeMultiple(bitmap).Select(result => result.Text).ToList(); // return only the barcode string.
                                                                               // If you want the full Result use: return reader.DecodeMultiple(bitmap);
}

谢谢，设置了TryHarder，好了。膜拜大神！