HOW TO: Read/Write barcodes using LEADTOOLS .NET Standard libraries

#1 Posted : Thursday, November 16, 2017 9:03:19 AM(UTC)

Walter

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Attached is a small .NET Core application written in C# using the LEADTOOLS 20 Barcode (.NET Standard) nuget package. This simple application generates an image with a QR code, outputs the image to a memory stream, and then reads the resulting MemoryStream to easily verify the encoding was done correctly.

The following sample code illustrates how a simple services could be written to process barcodes. Here's code illustrating barcode writing:

Code:


// Figure out how big to make the image
barcodeEngineInstance.Writer.CalculateBarcodeDataBounds(LeadRect.Empty, imageResolution, imageResolution, qrData, qrWriteOptions);
imageHeight = qrData.Bounds.Height;
imageWidth = qrData.Bounds.Width;

// Create an empty image
barcodeImage = new RasterImage(RasterMemoryFlags.Conventional, imageWidth, imageHeight, bitsPerPixel, RasterByteOrder.Rgb,
                               RasterViewPerspective.TopLeft, palette, IntPtr.Zero, userDataLength);

// Make the image all white
FillCommand fillCmd = new FillCommand(RasterColor.White);
fillCmd.Run(barcodeImage);
   
// Write the barcode
barcodeEngineInstance.Writer.WriteBarcode(barcodeImage, qrData, qrWriteOptions); 

// Save the results
codecs.Save(barcodeImage, barcodeOutputStream, RasterImageFormat.CcittGroup4, bitsPerPixel);

And here's code illustrating barcode reading:

Code:


// Decode the stream
barcodeImage = codecs.Load(inputStream, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1);

// Check for barcodes
dataArray = barcodeEngineInstance.Reader.ReadBarcodes(barcodeImage, LeadRect.Empty, 0, null);

// Get the barcode data to output
StringBuilder sb = new StringBuilder();
sb.AppendFormat("{0} barcode(s) found", dataArray.Length);
sb.AppendLine();

for (int i = 0; i < dataArray.Length; i++)
{
   BarcodeData data = dataArray[i];

   sb.AppendFormat("Symbology: {0}, Location: {1}, Data: {2}", data.Symbology.ToString(), data.Bounds.ToString(), data.Value);
   sb.AppendLine();
}

Before running this application, please update the DEVELOPER_LIC and DEVELOPER_KEY class members to point to your license files.

File Attachment(s):

CS_DotNetStd_WriteQRBarcode.zip (5kb) downloaded 350 time(s).

Edited by moderator Thursday, November 16, 2017 4:13:44 PM(UTC) | Reason: Not specified

Walter Bates
Senior Support Engineer
LEAD Technologies, Inc.


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HOW TO: Read/Write barcodes using LEADTOOLS .NET Standard libraries