Asp.net core 学习笔记 QR code and Barcode

时间 2019-12-06

标签 asp.net asp core 学习笔记 code barcode 栏目 ASP 繁體版

原文原文链接

QR code 和 Barcode 常常会使用到。html

Java 阵营有著名的 zxinggit

https://github.com/zxing/zxinggithub

.Net 有对接它的 portasp.net

https://github.com/micjahn/ZXing.Netide

调用很简单spa

var qrWriter = new BarcodeWriterPixelData
{
    Format = BarcodeFormat.QR_CODE,
    Options = new EncodingOptions { Height = 1000, Width = 1000, Margin = 10 }
};
var pixelData = qrWriter.Write("i love you");
using (var bitmap = new Bitmap(pixelData.Width, pixelData.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb))
using (var ms = new MemoryStream())
{
    // lock the data area for fast access
    var bitmapData = bitmap.LockBits(new 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);
    }
    // save to stream as PNG
    //bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    bitmap.Save(@"C:\keatkeat\my projects\asp.net core\2.2\html-to-pdf\Project\123.png", System.Drawing.Imaging.ImageFormat.Png);
}

Barcode Format 有不少种，能够本身选。.net

这里用到了 bitmap, 是从官网的 demo 里抄来的. code

早期 core 不支持 system draw, 因此 demo 里说依赖 CoreCompat.System.Drawing, orm

但后来 .net core 推出了 System.Drawing.Common 因此是跨平台的了.htm

demo : https://github.com/micjahn/ZXing.Net/tree/master/Clients/ASP.NetCoreDemo