I use ZXing.Net library to generate a QR code image -
At the top of my class:
Since you get a bitmap out of ZXing you can use standard C# techniques to draw text. See this answer for more info:
c# write text on bitmap
For posterity here's some shamelessly copied code:
Bitmap bmp = //from ZXing;
RectangleF rectf = new RectangleF(70, 90, 90, 50);
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawString("yourText", new Font("Tahoma",8), Brushes.Black, rectf);
g.Flush();
Here we go (you can use any logo):
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using ZXing;
using ZXing.QrCode.Internal;
using ZXing.Rendering;
namespace Test
{
public partial class Form1 : Form
{
private string imagePath = @"YourPath";
private string url = @"https://en.WIKIPEDIA.ORG/";
private int size = 400;
public Form1()
{
InitializeComponent();
pictureBox1.Image = GenerateQR(size, size, url);
pictureBox1.Height = size;
pictureBox1.Width = size;
Console.WriteLine(checkQR(new Bitmap(pictureBox1.Image)));
}
public bool checkQR(Bitmap QrCode)
{
var reader = new BarcodeReader();
var result = reader.Decode(QrCode);
if (result == null)
return false;
return result.Text == url;
}
public Bitmap GenerateQR(int width, int height, string text)
{
var bw = new ZXing.BarcodeWriter();
var encOptions = new ZXing.Common.EncodingOptions
{
Width = width,
Height = height,
Margin = 0,
PureBarcode = false
};
encOptions.Hints.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
bw.Renderer = new BitmapRenderer();
bw.Options = encOptions;
bw.Format = ZXing.BarcodeFormat.QR_CODE;
Bitmap bm = bw.Write(text);
Bitmap overlay = new Bitmap(imagePath);
int deltaHeigth = bm.Height - overlay.Height;
int deltaWidth = bm.Width - overlay.Width;
Graphics g = Graphics.FromImage(bm);
g.DrawImage(overlay, new Point(deltaWidth/2,deltaHeigth/2));
return bm;
}
}
The result:
And the output:
True