C#•2mo ago

✅ PdfPig

I don't know what I am doing wrong. I am trying to generate a PDF document and attach an image (PNG) to the PDF Document. The problem is that I keep getting an index out of range exception. I did the math, and the points I use for the image coordinates are correct (At least, I am 98% sure). This is what I have:

private const double POINT_VALUE = 2.83465f;
private const double MARGIN = 10 * POINT_VALUE;
private const double PAGE_WIDTH = 60 * POINT_VALUE; // 170.079 points
private const double PAGE_HEIGHT = 108 * POINT_VALUE; // 306.142 points
private const double IMAGE_WIDTH = 40 * POINT_VALUE; // 113.386 points
private const double IMAGE_HEIGHT = 40 * POINT_VALUE; // 113.386 points
private const double IMAGE_X1 = MARGIN;
private const double IMAGE_Y1 = PAGE_HEIGHT - MARGIN - IMAGE_HEIGHT;
private const double IMAGE_X2 = IMAGE_X1 + IMAGE_WIDTH;
private const double IMAGE_Y2 = PAGE_HEIGHT - MARGIN;

public byte[] GeneratePrintableLabel(LogisticsViewModel model)
{
    PdfDocumentBuilder builder = new PdfDocumentBuilder();
    var fontBytes = File.ReadAllBytes("wwwroot/assets/fonts/la-regular-400.ttf");
    var font = builder.AddTrueTypeFont(fontBytes);

    var page = builder.AddPage(PAGE_WIDTH, PAGE_HEIGHT);

    var qrCodeBytes = GenerateQrCode($"{model.Description}|{model.PalletNumber}|{model.Batch}|{model.Date:dd/MM/yyyy}|{model.Quantity}");

    var qrPlacement = new PdfRectangle(IMAGE_X1, IMAGE_Y1, IMAGE_X2, IMAGE_Y2);
    page.AddPng(qrCodeBytes, qrPlacement);

    page.AddText($"Description: {model.Description}", 12, new PdfPoint(IMAGE_X2 + MARGIN, PAGE_HEIGHT - MARGIN - 20), font);
    page.AddText($"Quantity: {model.Quantity}", 12, new PdfPoint(IMAGE_X2 + MARGIN, PAGE_HEIGHT - MARGIN - 40), font);

    var pdfDocument = builder.Build();
    using (var stream = new MemoryStream())
    {
        return stream.ToArray();
    }
}

private const double POINT_VALUE = 2.83465f;
private const double MARGIN = 10 * POINT_VALUE;
private const double PAGE_WIDTH = 60 * POINT_VALUE; // 170.079 points
private const double PAGE_HEIGHT = 108 * POINT_VALUE; // 306.142 points
private const double IMAGE_WIDTH = 40 * POINT_VALUE; // 113.386 points
private const double IMAGE_HEIGHT = 40 * POINT_VALUE; // 113.386 points
private const double IMAGE_X1 = MARGIN;
private const double IMAGE_Y1 = PAGE_HEIGHT - MARGIN - IMAGE_HEIGHT;
private const double IMAGE_X2 = IMAGE_X1 + IMAGE_WIDTH;
private const double IMAGE_Y2 = PAGE_HEIGHT - MARGIN;

public byte[] GeneratePrintableLabel(LogisticsViewModel model)
{
    PdfDocumentBuilder builder = new PdfDocumentBuilder();
    var fontBytes = File.ReadAllBytes("wwwroot/assets/fonts/la-regular-400.ttf");
    var font = builder.AddTrueTypeFont(fontBytes);

    var page = builder.AddPage(PAGE_WIDTH, PAGE_HEIGHT);

    var qrCodeBytes = GenerateQrCode($"{model.Description}|{model.PalletNumber}|{model.Batch}|{model.Date:dd/MM/yyyy}|{model.Quantity}");

    var qrPlacement = new PdfRectangle(IMAGE_X1, IMAGE_Y1, IMAGE_X2, IMAGE_Y2);
    page.AddPng(qrCodeBytes, qrPlacement);

    page.AddText($"Description: {model.Description}", 12, new PdfPoint(IMAGE_X2 + MARGIN, PAGE_HEIGHT - MARGIN - 20), font);
    page.AddText($"Quantity: {model.Quantity}", 12, new PdfPoint(IMAGE_X2 + MARGIN, PAGE_HEIGHT - MARGIN - 40), font);

    var pdfDocument = builder.Build();
    using (var stream = new MemoryStream())
    {
        return stream.ToArray();
    }
}

For context: X1 and Y1 = Bottom Left coordinates and X2 and Y2 is top right.

7 Replies

Anton•2mo ago

which line are you getting that at?

jcotton42•2mo ago

@apnxmammoth share the exact line and error message you get that on

apnxmammothOP•2mo ago

page.AddPng(qrCodeBytes, qrPlacement); Sorry Anton. I didn't get notified when you messaged, but at page.AddPng()

jcotton42•2mo ago

and the full exception?

apnxmammothOP•2mo ago

System.IndexOutOfRangeException: Index was outside the bounds of the array. at UglyToad.PdfPig.Images.Png.RawPngData.GetPixel(Int32 x, Int32 y) at UglyToad.PdfPig.Writer.PdfPageBuilder.AddPng(Stream pngStream, PdfRectangle placementRectangle) at UglyToad.PdfPig.Writer.PdfPageBuilder.AddPng(Byte[] pngBytes, PdfRectangle placementRectangle) at PrintHelper.GeneratePrintableLabel(LogisticsViewModel model) in Helper\PrintHelper.cs:line 23 at LogisticsController.Create(LogisticsViewModel model) in Controllers\LogisticsController.cs:line 51 at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker... Unable to send full exception, character limit.

Joreyk ( IXLLEGACYIXL )•2mo ago

put it into a gist https://gist.github.com/

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Unknown User•2mo ago

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