產生qr_code圖片(base64)

最近專案上用到了QR CODE，這個class可以把字串轉成QR code圖片

	using System;
	using System.Collections.Generic;
	using System.Drawing;
	using System.IO;
	using System.Linq;
	using System.Text;
	using System.Web;
	using ZXing;
	using ZXing.QrCode;
	/// <summary>
	/// cs_Qrcode_Generate 的摘要描述
	/// </summary>
	public class cs_Qrcode_Generate
	{
	public cs_Qrcode_Generate()
	{
	//
	// TODO: 在這裡新增建構函式邏輯
	//
	}
	public string hashString(string s)
	{
	string result="";
	return result;
	}
	public string Gen_Base64(String s){//字數不可超過300字
	string sEncode = "utf-8"; //---或者gb2312
	string EncoderContent = GetEncodingString(s,sEncode);
	if (s.Length > 300) return null;
	IBarcodeWriter writer = new BarcodeWriter
	{
	Format = BarcodeFormat.QR_CODE,
	Options = new QrCodeEncodingOptions
	{
	Width = 400,
	Height = 400
	}
	};
	var result = writer.Write(EncoderContent);
	var bitmap = new Bitmap(result);
	return Convert.ToBase64String(ImageToByte2(bitmap));
	}
	//轉碼
	private string GetEncodingString(string srcString, string sEncode)
	{
	Encoding e8859Encode = Encoding.GetEncoding("iso-8859-1");
	Encoding srcEncode = Encoding.Unicode;
	Encoding dstEncode = Encoding.GetEncoding(sEncode);
	byte[] srcBytes = srcEncode.GetBytes(srcString);
	byte[] dstBytes = Encoding.Convert(srcEncode, dstEncode, srcBytes);
	char[] dstChars = new char[e8859Encode.GetCharCount(dstBytes, 0, dstBytes.Length)];
	e8859Encode.GetChars(dstBytes, 0, dstBytes.Length, dstChars, 0);
	return new string(dstChars);
	}
	//bitmap轉byte[] 記憶體
	public static byte[] ImageToByte2(Image img)
	{
	byte[] byteArray = new byte[0];
	using (MemoryStream stream = new MemoryStream())
	{
	img.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
	stream.Close();
	byteArray = stream.ToArray();
	}
	return byteArray;
	}
	}

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