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Mirokov

Problems encoding Data Matrix (non-latin characters) in .NET

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Hello, we tried porting the DataMatrix from the old version of the software with the .NET Barcode Generator. We are having an issue encoding non-latin characters and size; we have this function:

public static string GetDataMatrix(string data)
{
try
{
if (string.IsNullOrEmpty(data)) return BitmapToBase64(new Bitmap(1, 1));
using DataMatrixBarcode dataMatrix = new DataMatrixBarcode();
dataMatrix.DataToEncode = data;
dataMatrix.EncodingMode = IDAutomation.Windows.Forms.DataMatrixBarcode.EncodingModes.Ascii;
dataMatrix.Resolution = IDAutomation.Windows.Forms.DataMatrixBarcode.Resolutions.Custom;
dataMatrix.ResolutionCustomDPI = 400;
return BitmapToBase64(dataMatrix.BMPPicture);
}
catch (Exception e)
{
string message = $"Error creating DataMatrix as Image for value {data} Exception: {e.Message}";
throw new Exception(message);
}
}

into new version (.NET Generator):
public static string GetDataMatrix(string data)
{
var compatibilityFactor = 1.88m; // empirical value
var applyTilde = false;
try
{
if (string.IsNullOrEmpty(data))
{
using var newBitmap = new Bitmap(1, 1);
return BitmapToBase64(newBitmap);
}

var moduleSize = (int)Math.Round((0.03m * 400m) * compatibilityFactor / 2.54m); // 400 DPI conversion
var obj = new DataMatrix();
var bmpstream = obj.EncodeDM(data, applyTilde, IDAutomatization.DataMatrix.EncodingModes.Ascii, -1, 3,
moduleSize);
using var mStream = new MemoryStream(bmpstream);
using var bitmap = (Bitmap)Image.FromStream(mStream);
return BitmapToBase64(bitmap);
}
catch (Exception e)
{
var message = $"Error creating DataMatrix as Image for value {data} Exception: {e.Message}";
throw new Exception(message);
}
}

Here are our tests:
[DataRow("SpecialChars", "https://test.com/?id=123&secret=~!@")]
[DataRow("Non Latin", "Español Français")]
public void DataMatrix(string testName, string testData)
{
testName = $"{nameof(DataMatrix)}_{testName}_";
var originalData = BarcodeFunctions.GetDataMatrix(testData);
File.WriteAllBytes($"{testName}_old.png", Convert.FromBase64String(originalData));
var data = NET.BarcodeFunctions.GetDataMatrix(testData);
File.WriteAllBytes($"{testName}_new.png", Convert.FromBase64String(data));
Assert.AreEqual(originalData, data);
}

Could you provide us with some guidance on the parameters:
Format
ApplyTilde
QuietZone
Module Size
Do you think we have done right in converting those from the old solution, or do you have some things we could improve? We are trying to achieve the same barcode (size) as we had before.
Also some additional explanation on the Format parameter would be welcome. What are its possible values, what effect do they have?

04-17-25 18 day(s) ago

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Brant	Best Answer To encode non-latin characters in Data Matrix, set the encoding mode to Auto or Byte. The size of the Data Matrix symbol is a combination of Format and Module Size. Different sizes are also achieved from the various generation methods, such as BMP or the use of the font. I recommend you refer to the Visual Studio example in the download folder at "Data Matrix - BarcodeGenerationExample C#.NET - bin - Release - signed - BarcodeGenerationExample.exe" to find the best size. The parameters are explained at the bottom of the .NET Data Matrix Code Examples. Posted 18 day(s) ago (0) (0) Report Abuse

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