扫描条形码IDAutomationHC39M后没有获得价值

Question

我正在生成IDAutomationHC39M条形码，但在生成和扫描后，我没有得到任何值。

我的代码是

    public void generateBarcode(int id)
    {
        if (plBarCode != null)
        {
            string barCode = "";

            barCode = "*"+Convert.ToString(id)+"*";
            System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
            using (Bitmap bitMap = new Bitmap(barCode.Length * 70, 70))
            {
                using (Graphics graphics = Graphics.FromImage(bitMap))
                {
                    Font oFont = new Font("IDAutomationHC39M", 30);
                    PointF point = new PointF(2f, 2f);
                    SolidBrush blackBrush = new SolidBrush(Color.Black);
                    SolidBrush whiteBrush = new SolidBrush(Color.White);
                    graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);                       
                    int w = barCode.Length * 40;                    
                    Graphics oGraphics = Graphics.FromImage(bitMap);                    
                    PointF oPoint = new PointF(2f, 2f);
                    SolidBrush oBrushWrite = new SolidBrush(Color.Black);
                    SolidBrush oBrush = new SolidBrush(Color.White);         
                    oGraphics.FillRectangle(oBrush, 0, 0, w, 100);                       
                    oGraphics.DrawString("*" + barCode + "*", oFont, oBrushWrite, oPoint);

                }
                using (MemoryStream ms = new MemoryStream())
                {
                    bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    byte[] byteImage = ms.ToArray();

                    Convert.ToBase64String(byteImage);
                    imgBarCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
                }
                plBarCode.Controls.Add(imgBarCode);
            }
        }

    }

这段代码有什么不对。

我应该如何生成代码？

Answer 1

以下是条形码字体无法扫描的前5个原因......

http://idautomation.blogspot.in/2011/07/top-5-reasons-why-barcode-font-wont.html

如果您尝试对少量字符进行编码，最好确保您的扫描仪能够扫描最小量，因为许多设置为在条形码中读取至少4个字符。另一方面，如果在条形码中编码的字符太多，则它将太大并且将无法正确扫描。减小字体大小并重新扫描可能会解决此问题。