Barcode Text not rendered in Viewer output

[primo-ppcg]

Using:

.NET Framework 4.7.2
BinaryKits.Zpl.Label 3.1.0
BinaryKits.Zpl.Viewer 1.1.1

All other dependencies up to date.

Method for creating label preview:

DialogResult result = this.openFileDialog.ShowDialog();
if(result == DialogResult.OK) {
    string content = File.ReadAllText(this.openFileDialog.FileName);

    IPrinterStorage printerStorage = new PrinterStorage();
    ZplElementDrawer drawer = new ZplElementDrawer(printerStorage);

    ZplAnalyzer analyzer = new ZplAnalyzer(printerStorage);
    AnalyzeInfo analyzeInfo = analyzer.Analyze(content);

    foreach(LabelInfo labelInfo in analyzeInfo.LabelInfos) {
        byte[] labelData = drawer.Draw(labelInfo.ZplElements);
        File.WriteAllBytes("label.png", labelData);
    }
}

Using this sample label data:

^XA

^BY3,2,100
^FO100,750,^BC^FDTEST0123456789^FS

^XZ

Actual:

Expected (labelary.com reference):

[tinohager]

Hello this is a known bug that we still need to fix

[primo-ppcg]

@tinohager thanks for the quick reply.

I looks like IncludeLabel isn't being specified in the various BarcodeElementDrawers:

var barcodeElement = new Barcode
{
    BarWidth = barcode.ModuleWidth,
    BackColor = Color.Transparent,
    Height = barcode.Height
};

For the example above, I was able to get fairly reasonable results using the following:

var barcodeElement = new Barcode {
    BarWidth = barcode.ModuleWidth,
    BackColor = Color.Transparent,
    Height = barcode.Height + 33,
    IncludeLabel = true,
    LabelFont = new Font("DejaVu Sans Mono", 22)
};

The appropriate label size and additional height would need to computed at some point before the draw, but I don't see a convenient site. Likely these would need to be passed as properties of the ZplBarcode.

[tinohager]

The problem is that the label can also be above the barcode

^XA

^FX Third section with bar code.
^BY5,2,270
^FO100,550
^B1N,N,158,Y,Y
^FD12345678^FS

^XZ

[ingfdoaguirre]

you need to get the text width and define offset in X and Y depending on the case:

//Define offset in X and Y
offsetX := x + (barcodeWidth-textWidth)/2
offsetY := y + barcodeHeight

//If text needed to be above barcode, recalculate offsets
if PrintInterpretationLineAboveCode {
	offsetX = x + (barcodeWidth-textWidth)/2
	offsetY = y - fontHeight
}

This is a pseudocode, but It will work, I have ported the viewer to Go and draw the text correctly

[tinohager]

@ingfdoaguirre is your viewer also open source available? Is there a reason for porting to another language?

[ingfdoaguirre]

@ingfdoaguirre is your viewer also open source available? Is there a reason for porting to another language?

Hi Tino, first I'm dont have the sufficient knowledge of C#, also I used tried to use the viewer to create PDF files intead images.

The first approach was to only append the image to a pdf file, but the final file size, was big on a document with some labels.

Then I tried pdfSharp to make "native pdf file", it worked well.

The problem came when I made some tests, the ram memory usage was increasingly, lets say that on every page added to document, ram was increased by 20mb. I tried some some solutions, but no one worked. Then I tried on my win11 partition, and the ram leak was not present (I develop on Ubuntu).

After some research I discovered that the "System.Drawing.Common" library only works on windows (: and the problem with memory leak, was pdfSharp that doesn't already implemented a solution to that.

Also this is the only open source library to analyze Zpl, and I use Go in my microservices, so I made a port.

I will upload that port to github and make open source this week, I'm solving some details. And I will explicitily say that is a port from this library, thats the reality and not a problem to me.

Also was a personal challenge, and it was fun.

[tinohager]

Have you already built your port on the Protocol project?
Viewer based on Label instead of Protocol

[primo-ppcg]

The problem is that the label can also be above the barcode

You can also set the LabelPosition of the BarcodeLib.Barcode to TOPCENTER, e.g.:

var barcodeElement = new Barcode {
    BarWidth = barcode.ModuleWidth,
    BackColor = Color.Transparent,
    Height = barcode.Height + barcode.LabelHeight,
    IncludeLabel = true,
    LabelPosition = LabelPositions.TOPCENTER,
    LabelFont = barcode.LabelFont
};

[tinohager]

@primo-ppcg Can you create a pull request?

[primo-ppcg]

@primo-ppcg Can you create a pull request?

The one bit of difficulty that I'm having is that BarcodeLib takes a System.Drawing.Font rather than a SKFont. I'm not quite sure how to deal with that in an elegant way.

[YipingRuan]

@primo-ppcg
Is this fixed by #122 ?

[primo-ppcg]

@primo-ppcg Is this fixed by #122 ?

Mode A is complete, mode N is partially supported. I intend to add support for mode D, and more complete support for mode N - as much as can be with the BarcodeLib library.