本文实例讲述了C#基于QRCode实现动态生成自定义二维码图片功能。分享给大家供大家参考，具体如下：
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;
}
/// <summary>
/// 生成自定义图片
/// </summary>
/// <param name="codeImage">生成的二维码</param>
/// <param name="objectName">物体名称</param>
/// <returns>自定义图片内存流</returns>
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点击此处 本站下载 。
希望本文所述对大家C#程序设计有所帮助。
原文链接：https://blog.csdn.net/xiaouncle/article/details/52588947
dy("nrwz");
查看更多关于C#基于QRCode实现动态生成自定义二维码图片功能示例的详细内容...