解码图像时出错

时间:2012-10-24 19:39:20

标签: c# asp.net barcode-scanner

我正在尝试使用MessagingToolkit来解码C#/ ASP.NET中的图像。我已经设法使用这个包编码一个qr,但是当我尝试解码时,使用下面的代码会出现2个错误(在页面底部)

我认为这是因为我在上传后没有正确获取图像,但有人可能会指出我出错的地方。感谢。

    protected void CreateCode_OnClick(object sender, EventArgs e)
    {
        string path = "C:\\Users\\Wayneio\\Documents\\Visual Studio 2012\\Projects\\BAMSystem\\BAMSystem\\";
        if (QRUpload.HasFiles == true)
        {
            FileInfo fi = new FileInfo(QRUpload.FileName);
            string extA = fi.Extension;
            if (extA == ".jpg" || extA == ".png")
            {
               QRCodeDecoder decoder = new QRCodeDecoder();
               QRUpload.SaveAs(path + QRUpload.FileName);

               System.Drawing.Image myImg = System.Drawing.Image.FromFile(path + QRUpload.FileName);
               decoder.Decode(myImg);

            }
            else
            {
                error.Text = "You have uploaded a " + extA + " file. Please upload either a PNG or a JPG";
            }
        }
        else
        {
            error.Text = "You have not uploaded an image.";
        }
    }

ERROR1:

Error   2   Argument 1: cannot convert from 'System.Drawing.Image' to 'MessagingToolkit.QRCode.Codec.Data.QRCodeImage'  c:\users\wayneio\documents\visual studio 2012\Projects\BAMSystem\BAMSystem\default.aspx.cs  38  35  BAMSystem

误差2:

Error   1   The best overloaded method match for 'MessagingToolkit.QRCode.Codec.QRCodeDecoder.Decode(MessagingToolkit.QRCode.Codec.Data.QRCodeImage)' has some invalid arguments    c:\users\wayneio\documents\visual studio 2012\Projects\BAMSystem\BAMSystem\default.aspx.cs  38  20  BAMSystem

如果有人有关于这个MessagingToolkit QR包的文档,那么它将是有用的

1 个答案:

答案 0 :(得分:1)

解码接受“位图”类型图像。

System.Drawing.Bitmap myImg = new System.Drawing.Bitmap(FileName);
Dictionary<DecodeOptions, object> decodingOptions = new Dictionary<DecodeOptions, object>();
List<BarcodeFormat> possibleFormats = new List<BarcodeFormat>(10);

                        possibleFormats.Add(BarcodeFormat.DataMatrix);
                        possibleFormats.Add(BarcodeFormat.QRCode);
                        possibleFormats.Add(BarcodeFormat.PDF417);
                        possibleFormats.Add(BarcodeFormat.Aztec);
                        possibleFormats.Add(BarcodeFormat.UPCE);
                        possibleFormats.Add(BarcodeFormat.UPCA);
                        possibleFormats.Add(BarcodeFormat.Code128);
                        possibleFormats.Add(BarcodeFormat.Code39);
                        possibleFormats.Add(BarcodeFormat.ITF14);
                        possibleFormats.Add(BarcodeFormat.EAN8);
                        possibleFormats.Add(BarcodeFormat.EAN13);
                        possibleFormats.Add(BarcodeFormat.RSS14);
                        possibleFormats.Add(BarcodeFormat.RSSExpanded);
                        possibleFormats.Add(BarcodeFormat.Codabar);
                        possibleFormats.Add(BarcodeFormat.MaxiCode);

 decodingOptions.Add(DecodeOptions.TryHarder, true);
 decodingOptions.Add(DecodeOptions.PossibleFormats, possibleFormats);
Result decodedResult = decoder.Decode(myImg, decodingOptions);

          if (decodedResult != null)
                        {
                          //.. success
                        }

此外,您还可以省略“decodingOptions”选项参数,因为解码器还具有重载Decode(位图图像​​)。

System.Drawing.Bitmap myImg = new System.Drawing.Bitmap(FileName);
Result decodedResult = decoder.Decode(myImg);

          if (decodedResult != null)
                        {
                          //.. success
                        }

如果您只想进行QRCode解码,

    System.Drawing.Bitmap myImg = new System.Drawing.Bitmap(FileName);
    Dictionary<DecodeOptions, object> decodingOptions = new Dictionary<DecodeOptions, object>();
    List<BarcodeFormat> possibleFormats = new List<BarcodeFormat>();
    possibleFormats.Add(BarcodeFormat.QRCode);                              
    decodingOptions.Add(DecodeOptions.TryHarder, true);
    decodingOptions.Add(DecodeOptions.PossibleFormats, possibleFormats);
    Result decodedResult = decoder.Decode(myImg, decodingOptions);
     if (decodedResult != null)
       {
          //.. success
       }

您可以在此处找到文档和代码 http://platform.twit88.com/projects/show/mt-barcode

示例代码..download here ..还有演示代码 http://platform.twit88.com/projects/mt-barcode/files

这里的代码项目
http://www.codeproject.com/Articles/20574/Open-Source-QRCode-Library