问题
I am trying to generating IDAutomationHC39M for number 50 or 51 the barcode for that gets generated but on scanning I am not able to get the Detail number for that.
Same way I am able to create the barcode for 14757 and in that case I am able to scan that barcode properly.
How should I scan 2 digit generated Barcodes.
Is there some thing I am doing wrong in below code.
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);
}
}
}
Generated the below barcode with number 56 and also removed * from the passing string still on scanning not returning the data 56.
回答1:
Use this modified code.
public void generateBarcode(string id)
{
int w = id.Length * 55;
// Create a bitmap object of the width that we calculated and height of 100
Bitmap oBitmap = new Bitmap(w, 100);
// then create a Graphic object for the bitmap we just created.
Graphics oGraphics = Graphics.FromImage(oBitmap);
// Now create a Font object for the Barcode Font
// (in this case the IDAutomationHC39M) of 18 point size
Font oFont = new Font("IDAutomationHC39M", 18);
// Let's create the Point and Brushes for the barcode
PointF oPoint = new PointF(2f, 2f);
SolidBrush oBrushWrite = new SolidBrush(Color.Black);
SolidBrush oBrush = new SolidBrush(Color.White);
// Now lets create the actual barcode image
// with a rectangle filled with white color
oGraphics.FillRectangle(oBrush, 0, 0, w, 100);
// We have to put prefix and sufix of an asterisk (*),
// in order to be a valid barcode
oGraphics.DrawString("*" + id + "*", oFont, oBrushWrite, oPoint);
// Then we send the Graphics with the actual barcode
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
using (System.IO.FileStream fs = System.IO.File.Open(Server.MapPath("~/img/barcodes/") + id + ".jpg", FileMode.Create))
{
oBitmap.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
}
oBitmap.Dispose();
imgbarcode.ImageUrl = "~/img/barcodes/"+id+".jpg";
}
回答2:
Looks like you have 6 characters there. Two '*' characters start and end the barcode.
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAD/AAAAAAAAAAAAAAABAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAATUoCA+Jw8kAAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/Af//AAABAAAAAAAAAAAAAAD/AAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAajkDAr7LFAwAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAAAAAAAAAAAAP8AAAABAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAARVICA/z3WM0AAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/Af//AAABAAAAAAAAAAAAAAD/AAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAajkDAr7LFAwAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAD/AAAAAAAAAAAAAAABAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAATUoCA+Jw8kAAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/ASL/AADeAAAA/gAAAAIAAAD+AAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAh6QEAZKdo54AAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAD/AAAAAQAAAP8AAAABAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAak4DA7VAmk0AAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/Af//AAAAAAAAAAAAAAEAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAUUoCA+juoggAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAD/AAAAAQAAAAAAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAATVICAxOyzrMAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/Af//AAABAAAA/wAAAAEAAAD/AAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAizUEAhrxcbgAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/Af//AAAAAAAAAQAAAP8AAAABAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAbkoDA3iPVH4AAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAAAAAAA/wAAAAEAAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAASVICA62zYxMAAAAASUVORK5CYII=" width="10" height="40"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAACCAQAAADLaIVbAAAANUlEQVQIHQEqANX/AQD/AAD/AAAAAQAAAP8AAAAAAAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAajUDAvnk9E4AAAAASUVORK5CYII=" width="10" height="40">I get this when I plug 50 in. Looks like you need to remove the two asterisks you are adding before and after barCode in the 'DrawString' method.
Here is my added image.
回答3:
You might want to try this:
protected void btnGenerate_Click(object sender, EventArgs e)
{
string barCode = txtCode.Text;
//testbar.Text = txtCode.Text;
System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
using (Bitmap bitMap = new Bitmap(barCode.Length * 28, 90))
{
using (Graphics graphics = Graphics.FromImage(bitMap))
{
var fonts = new PrivateFontCollection();
fonts.AddFontFile(Server.MapPath("~/font/IDAutomationHC39M.ttf"));
Font oFont = new Font((FontFamily)fonts.Families[0], 17f);
//Font oFont = new Font("IDAutomationHC39M", 10,FontStyle.Regular,GraphicsUnit.Pixel);
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);
graphics.DrawString("*" + barCode + "*", oFont , blackBrush, point);
}
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);
}
}
来源：https://stackoverflow.com/questions/46057092/create-2-digit-barcode-for-idautomationhc39m-but-not-scanning