private byte[] CreateQrCodeLogo(string content)
{
var qrCodeWriter = new BarcodeWriterPixelData()
{
Format = BarcodeFormat.QR_CODE,
Options = new QrCodeEncodingOptions()
{
Height = 250,
Width = 250,
Margin = 0,
ErrorCorrection = _level,
CharacterSet = "UTF-8"
}
};
var temp = qrCodeWriter.Encode(content);
var pixelData = qrCodeWriter.Write(content);
using (var bitmap = new System.Drawing.Bitmap(pixelData.Width, pixelData.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb))
{
using (var ms = new 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
{
System.Runtime.InteropServices.Marshal.Copy(pixelData.Pixels, 0, bitmapData.Scan0,
pixelData.Pixels.Length);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
Bitmap logo = new Bitmap(_logoPath);
// 获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
int[] rectangle = temp.getEnclosingRectangle();
// 计算插入图片的大小和位置
int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);
int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);
int middleL = (bitmap.Width - middleW) / 2;
int middleT = (bitmap.Height - middleH) / 2;
// 将img转换成bmp格式，否则后面无法创建Graphics对象
//Bitmap bmpImg = new Bitmap(bitmap.Width, bitmap.Height, PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(bitmap))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.DrawImage(bitmap, 0, 0);
}
// 将二维码插入图片
Graphics mg = Graphics.FromImage(bitmap);
// 白底
mg.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
mg.DrawImage(logo, middleL, middleT, middleW, middleH);
bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
return(ms.ToArray());
}
}
}