Generate EAN Barcode Using ZXing.Net and get a base64 string

Question

I would like to generate EAN 13 Barcode using ZXing.NET in ASP.NET and convert it to the base64 string.

I have a problem how to convert BarcodeWriterPixelData which I'm getting from:

BarcodeWriterPixelData writer = new BarcodeWriterPixelData()
{
   Format = BarcodeFormat.EAN_13
};
var pixelData = writer.Write(barcodeModel.BarcodeNumber);

I was trying by using ImageSharp

var base64String = string.Empty;
using (Image<Rgba32> image = Image.Load<Rgba32>(pixelData.Pixels))
{
    base64String = image.ToBase64String();
}

But it's not working.

score 6 · Accepted Answer · edited May 23 '17 at 12:18

6

You can use System.Drawing.Bitmap to do this. Add reference to CoreCompat.System.Drawing nuget package (it's in beta) and then use this code:

BarcodeWriterPixelData writer = new BarcodeWriterPixelData()
{
    Format = BarcodeFormat.EAN_13
};
var pixelData = writer.Write(barcodeModel.BarcodeNumber);

using (var bitmap = new System.Drawing.Bitmap(pixelData.Width, pixelData.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb))
{
    using (var ms = new System.IO.MemoryStream())
    {
        var bitmapData = bitmap.LockBits(new System.Drawing.Rectangle(0, 0, pixelData.Width, pixelData.Height), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
        try
        {
             // we assume that the row stride of the bitmap is aligned to 4 byte multiplied by the width of the image   
            System.Runtime.InteropServices.Marshal.Copy(pixelData.Pixels, 0, bitmapData.Scan0, pixelData.Pixels.Length);
        }
        finally
        {
            bitmap.UnlockBits(bitmapData);
        }

        // PNG or JPEG or whatever you want
        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        var base64str = Convert.ToBase64String(ms.ToArray());
    }
}

As far as I know ImageSharp is not released yet. I recommended CoreCompact based on this answer.

edited May 23 '17 at 12:18

Community

1
1

answered May 16 '17 at 09:54

Dávid Molnár

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I'm getting an error Non-invocable member 'Rectangle' cannot be used like a method. – mskuratowski May 16 '17 at 10:45
Sorry, I somehow deleted the "new" part. Edited, try now. – Dávid Molnár May 16 '17 at 10:49
It works, but now I have another error on the first using statement: The type initializer for 'System.Drawing.GDIPlus' threw an exception. The whole an erro message: Message = "Unable to load DLL 'gdiplus': The specified module could not be found.\n (Exception from HRESULT: 0x8007007E)" – mskuratowski May 16 '17 at 10:53
What kind of exception? I tested it on Windows 10, Visual Studio 2017, .NET Core 1.1. You? – Dávid Molnár May 16 '17 at 10:55
The same, but I run the app with Docker. maybe that's the problem. – mskuratowski May 16 '17 at 10:56
Did you include all the dll-s in the container? CoreCompat.System.Drawing.dll, System.Drawing.Primitives.dll etc..? Try to do "publish" and see the output. – Dávid Molnár May 16 '17 at 11:01
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/144341/discussion-between-cieja-and-david-molnar). – mskuratowski May 16 '17 at 11:02
Oh my god dude, you are the realest MVP, you are the 5/17/2017 savior! – Lostaunaum May 17 '17 at 20:21

tocsoft · Answer 2 · 2017-08-22T09:54:49.630

You can use ImageSharp to load up the raw pixel data (assuming pixelData.Pixels is a byte[] containing raw rgba32 formatted pixel data). Instead of using Image.Load<Rgba32>(data, width, height) you should be using Image.LoadPixelData<Rgba32>(data)

So you final loading code would be:

var base64String = string.Empty;
using (Image<Rgba32> image = Image.LoadPixelData<Rgba32>(pixelData.Pixels, width, height))
{
    base64String = image.ToBase64String(ImageFormats.Png);
}

Basically the Image.Load<Rgba32>(data) api is for loading up encoded data i.e. png, jpg etc formatted data. Where as the Image.LoadPixelData<Rgba32>(data) api is for loading up raw pixel data into the image object for later processing/saving.

Generate EAN Barcode Using ZXing.Net and get a base64 string

2 Answers2