C#利用QRCode动态生成自定义二维码图片

二维码早就传遍大江南北了,总以为它是个神奇的东西,其实细细研究之后发现也没想象的那么神秘,碰巧最近项目中需要动态生成二维码,解决完实际问题之后,简单总结整理一下。项目中除了动态生成二维码之外,还实现了动态生成自定义图片,二维码可以是其中的元素。

设置图片的数据源为动态图片

<body>
    <form id="form1" runat="server" >
    <div>
        <img src="GenerateImage.aspx?type=2" />
    div>
    form>
body>

动态生成图片

GenerateImage.aspx.cs文件内容

protected void Page_Load(object sender, EventArgs e)
{
    string type = Request.QueryString["type"].ToString();
    Bitmap codeImage = Create_QRCode("分享才能获得更多,我尽力而为(5201314)", 6);
    MemoryStream ms = Create_ImgCode(codeImage, "分享才能获得更多,我尽力而为", "5201314", type);
    Response.ClearContent();
    Response.ContentType = "image/Png";
    Response.BinaryWrite(ms.ToArray());
    Response.End();
}

private Bitmap Create_QRCode(string codeNumber, int size)
{
    //创建二维码生成类  
    QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
    //设置编码模式  
    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
    //设置编码测量度  
    qrCodeEncoder.QRCodeScale = size;
    //设置编码版本  
    qrCodeEncoder.QRCodeVersion = 10;
    //设置编码错误纠正  
    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
    //生成二维码图片  
    System.Drawing.Bitmap codeImage = qrCodeEncoder.Encode(codeNumber, Encoding.UTF8);
    return codeImage;
}

///   
/// 生成自定义图片  
///   
/// 生成的二维码       
/// 物体名称  
/// 自定义图片内存流  
private MemoryStream Create_ImgCode(Bitmap codeImage, string objectName, string objectCode, string type)
{
    string path = string.Empty;
    if (type == "1")
    {
        //设置背景图片
        path = Server.MapPath("Images/backimg1.png");
    }
    else if (type == "2")
    {
        //设置背景图片
        path = Server.MapPath("Images/backimg2.png");
    }

    System.Drawing.Image img = System.Drawing.Image.FromFile(path);      
    Bitmap bg = new Bitmap(img);
    //为画布bg(图片bg)创建一只画笔
    Graphics g = Graphics.FromImage(bg);

    if (type == "1")
    {
        //【1】将位图文件codeImage画到画布g上
        //【2】codeImage左上角距画布左边界25px、距画布上边界56px
        //【3】codeImage的长为原长、宽为原宽
        g.DrawImage(codeImage, 25, 56, codeImage.Width, codeImage.Height);
    }
    else if (type == "2")
    {
        g.DrawImage(codeImage, 132, 19, 162, 162);
        System.Drawing.Brush b = new SolidBrush(Color.Black);
        Font font = new Font("宋体", 8, FontStyle.Regular);

        StringFormat sf = new StringFormat();
        sf.LineAlignment = StringAlignment.Center;  // 垂直居中
        sf.Alignment = StringAlignment.Near;        // 水平左对齐

        //string也是画到画布上的,当画的string长度大于112px时会自动换行
        SizeF stringSize = g.MeasureString("我的宣言:", font, 112, sf);
        int nWidth = (int)stringSize.Width + 1;
        int nHeight = (int)stringSize.Height + 1;
        RectangleF rf = new Rectangle(new Point(12, 64), new Size(nWidth, nHeight));
        g.DrawString("我的宣言:", font, b, rf, sf);

        stringSize = g.MeasureString(objectName, font, 112, sf);
        int objectWidth = (int)stringSize.Width + 1;
        int objectHeight = (int)stringSize.Height + 1;
        rf = new Rectangle(new Point(12, 64 + nHeight + 8), new Size(objectWidth, objectHeight));
        g.DrawString(objectName, font, b, rf, sf);

        SizeF stringSize1 = g.MeasureString("幸运数字:", font, 112, sf);
        nWidth = (int)stringSize1.Width + 1;
        nHeight = (int)stringSize1.Height + 1;
        RectangleF rf1 = new Rectangle(new Point(12, 136), new Size(nWidth, nHeight));
        g.DrawString("幸运数字:", font, b, rf1, sf);

        stringSize1 = g.MeasureString(objectCode, font, 112, sf);
        objectWidth = (int)stringSize1.Width + 1;
        objectHeight = (int)stringSize1.Height + 1;
        rf1 = new Rectangle(new Point(12, 136 + nHeight + 8), new Size(objectWidth, objectHeight));
        g.DrawString(objectCode, font, b, rf1, sf);
    }

    g.Dispose();
    GC.Collect();

    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    bg.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
    //将画布bg(图片bg)保存到指定路径
    path = Server.MapPath("Images");
    bg.Save(path + "\\photoName.png", System.Drawing.Imaging.ImageFormat.Png);
    codeImage.Dispose();
    bg.Dispose();

    return ms;
}

ThoughtWorks.QRCode.dll免费下载地址:http://download.csdn.net/detail/xiaouncle/9636525

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