c# 生成与解码二维码,自定义中心图片与边框
c# 的二维码 需借助插件ThoughtWorks
直接引用
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
//生成二维码方法1
//text 二维码的文本内容
//Counselor对象内含微信头像等信息
public static string GetTwoCodeMetho(string text, bk_Counselor Counselor)
{
String data = text;
string url = “”;
if (!string.IsNullOrEmpty(data))
{
//声明QRCodeEncoder 其属性在下面的详细方法中有解释
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeScale = 4;
qrCodeEncoder.QRCodeVersion = 8;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
Image image = CreateQRCode(data, QRCodeEncoder.ENCODE_MODE.BYTE, QRCodeEncoder.ERROR_CORRECTION.M, 8, 4, 0, 5);
//System.Drawing.Image image = qrCodeEncoder.Encode(data);
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);
System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
System.Drawing.Image codeimg;
//有微信头像地址
if (!string.IsNullOrEmpty(Counselor.CounselorImg))
{
System.Net.WebRequest webreq = System.Net.WebRequest.Create(Counselor.CounselorImg);
System.Net.WebResponse webres = webreq.GetResponse();
Stream stream = webres.GetResponseStream();
Image ImageWeixin;
ImageWeixin = Image.FromStream(stream);
stream.Close();
codeimg = CombinImage(image, ImageWeixin);
codeimg.Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
}
else
{
codeimg = image;
}
//保存图片到本地
string PortraitApp = “~/FileLibs/CodeImg/”;
if (!Directory.Exists(HttpContext.Current.Server.MapPath(PortraitApp)))
{
Directory.CreateDirectory(HttpContext.Current.Server.MapPath(PortraitApp));
}
string filename = Counselor.CounselorName + DateTime.Now.ToString(“yyyymmddhhmmssfff”).ToString() + “.png”;
string filepath = HttpContext.Current.Server.MapPath(PortraitApp) + “\\” + filename;
System.IO.FileStream fs = new System.IO.FileStream(filepath,
System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
codeimg.Save(fs, System.Drawing.Imaging.ImageFormat.Png);
//由于项目前后台分离 需要指定生成二维码后的url
string RetureFile = System.Configuration.ConfigurationManager.AppSettings[“RetureFile”].ToString();
url = RetureFile.Replace(“/FileLibs/File/”, “/FileLibs/CodeImg/”) + filename;
//HttpContext.Current.Response.ClearContent();
//HttpContext.Current.Response.ContentType = “image/png”;
//HttpContext.Current.Response.BinaryWrite(MStream1.ToArray());//直接输出图片 测试用
//处理完释放资源
//image.Dispose();
MStream.Dispose();
MStream1.Dispose();
}
return url;
//HttpContext.Current.Response.Flush();
//HttpContext.Current.Response.End();
}
测试 效果图如下：
/// <summary>
/// 生成二维码 本函数摘录自网友的方法，后面重写了一个
/// </summary>
/// <param name=”Content”>内容文本</param>
/// <param name=”QRCodeEncodeMode”>二维码编码方式</param>
/// <param name=”QRCodeErrorCorrect”>纠错码等级</param>
/// <param name=”QRCodeVersion”>二维码版本号 0-40</param>
/// <param name=”QRCodeScale”>每个小方格的预设宽度（像素），正整数</param>
/// <param name=”size”>图片尺寸（像素），0表示不设置</param>
/// <param name=”border”>图片白边（像素），当size大于0时有效</param>
/// <returns></returns>
public static System.Drawing.Image CreateQRCode(string Content,
QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode,
QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect, int QRCodeVersion,
int QRCodeScale, int size, int border)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect;
qrCodeEncoder.QRCodeScale = QRCodeScale;
qrCodeEncoder.QRCodeVersion = QRCodeVersion;
System.Drawing.Image image = qrCodeEncoder.Encode(Content);
#region 根据设定的目标图片尺寸调整二维码QRCodeScale设置，并添加边框
if (size > 0)
{
//当设定目标图片尺寸大于生成的尺寸时，逐步增大方格尺寸
#region 当设定目标图片尺寸大于生成的尺寸时，逐步增大方格尺寸
while (image.Width < size)
{
qrCodeEncoder.QRCodeScale++;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content);
if (imageNew.Width < size)
{
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
else
{
qrCodeEncoder.QRCodeScale–; //新尺寸未采用，恢复最终使用的尺寸
imageNew.Dispose();
imageNew = null;
break;
}
}
#endregion
//当设定目标图片尺寸小于生成的尺寸时，逐步减小方格尺寸
#region 当设定目标图片尺寸小于生成的尺寸时，逐步减小方格尺寸
while (image.Width > size && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale–;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
if (image.Width < size)
{
break;
}
}
#endregion
//如果目标尺寸大于生成的图片尺寸，则为图片增加白边
#region 如果目标尺寸大于生成的图片尺寸，则为图片增加白边
if (image.Width <= size)
{
//根据参数设置二维码图片白边的最小宽度
#region 根据参数设置二维码图片白边的最小宽度
if (border > 0)
{
while (image.Width <= size && size – image.Width < border
* 2 && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale–;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
}
#endregion
//当目标图片尺寸大于二维码尺寸时，将二维码绘制在目标尺寸白色画布的中心位置
if (image.Width < size)
{
//新建空白绘图
System.Drawing.Bitmap panel = new System.Drawing.Bitmap(size, size);
System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(panel);
int p_left = 0;
int p_top = 0;
if (image.Width <= size) //如果原图比目标形状宽
{
p_left = (size – image.Width) / 2;
}
if (image.Height <= size)
{
p_top = (size – image.Height) / 2;
}
//将生成的二维码图像粘贴至绘图的中心位置
graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height);
image = new System.Drawing.Bitmap(panel);
panel.Dispose();
panel = null;
graphic0.Dispose();
graphic0 = null;
}
}
#endregion
}
#endregion
return image;
}
//生成二维码方法3 text为文本或网址等内容，imgurl则为图片的网址
public static void GetTwoCodeMethoThree(string text, string imgurl = “”)
{
try
{
String data = text;
if (!string.IsNullOrEmpty(data))
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式:BYTE 能支持中文，ALPHA_NUMERIC 扫描出来的都是数
qrCodeEncoder.QRCodeScale = 4;//大小：值越大生成的二维码图片像素越高
qrCodeEncoder.QRCodeVersion = 8;//版本
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误校验、更正等级
Image image = CreateQRCode(text, QRCodeEncoder.ENCODE_MODE.BYTE,
QRCodeEncoder.ERROR_CORRECTION.M, 8, 4, 0, 5);
//System.Drawing.Image image = qrCodeEncoder.Encode(data);
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);
System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
System.Drawing.Image codeimg;
Image ImageWeixin;
if (!string.IsNullOrEmpty(imgurl))
{
try
{
//获得网络上的图片
System.Net.WebRequest webreq = System.Net.WebRequest.Create(imgurl);
System.Net.WebResponse webres = webreq.GetResponse();
Stream stream = webres.GetResponseStream();
ImageWeixin = Image.FromStream(stream);
stream.Close();
//贴图
codeimg = CombinImage(image, ImageWeixin);
codeimg.Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
}
catch { }
}
//codeimg.Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
//string filename = text + DateTime.Now.ToString(“yyyymmddhhmmssfff”).ToString() + “.png”;
//string filepath = HttpContext.Current.Server.MapPath(PortraitApp) + “\\” + filename;
//System.IO.FileStream fs = new System.IO.FileStream(filepath,
System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
//codeimg.Save(fs, System.Drawing.Imaging.ImageFormat.Png);
//string RetureFile = System.Configuration.ConfigurationManager.AppSettings[“RetureFile”].ToString();
//直接输出图片 不保存
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = “image/png”;
HttpContext.Current.Response.BinaryWrite(MStream1.ToArray());
image.Dispose();
MStream.Dispose();
MStream1.Dispose();
}
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
//return url;
}
catch (Exception ex)
{
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = “text/xml”;
HttpContext.Current.Response.Write(“操作异常:” + ex.ToString());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
}
/// <summary>
/// 调用此函数后使此两种图片合并，类似相册，有个
/// 背景图，中间贴自己的目标图片，注意参数不同 destImg使用的是已经初始化的Image，可用于网址类的图片
/// </summary>
/// <param name=”imgBack”>粘贴的源图片</param>
/// <param name=”destImg”>粘贴的目标图片</param>
public static Image CombinImage(Image imgBack, Image destImg, int Lenth = 40)
{
Image img = destImg; //照片图片
if (img.Height != Lenth || img.Width != Lenth)
{
img = KiResizeImage(img, Lenth, Lenth, 0);
//圆角处理 此处后来优化后调用一次就可以了
img = CreateRoundedCorner(img, “”, “TopLeft”);
img = CreateRoundedCorner(img, “”, “TopRight”);
img = CreateRoundedCorner(img, “”, “BottomLeft”);
img = CreateRoundedCorner(img, “”, “BottomRight”);
}
Graphics g = Graphics.FromImage(imgBack);
g.DrawImage(imgBack, 0, 0, imgBack.Width + 5, imgBack.Height + 5); //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);
g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 –
img.Width / 2 – 1, imgBack.Width / 2 – img.Width / 2 – 1, 1,
1);//相片四周刷一层黑色边框
//g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);
g.DrawImage(img, imgBack.Width / 2 – img.Width / 2, imgBack.Width / 2 – img.Width / 2, img.Width, img.Height);
GC.Collect();//资源释放
return imgBack;
}
/// <summary>
/// 调用此函数后使此两种图片合并，类似相册，有个
/// 背景图，中间贴自己的目标图片 参数不同，destImg使用的是本地路径
/// </summary>
/// <param name=”imgBack”>粘贴的源图片</param>
/// <param name=”destImg”>粘贴的目标图片</param>
public static Image CombinImage(Image imgBack, string destImg)
{
Image img = Image.FromFile(destImg); //照片图片
if (img.Height != 65 || img.Width != 65)
{
img = KiResizeImage(img, 45, 45, 0);
}
Graphics g = Graphics.FromImage(imgBack);
g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height); //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);
//g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 –
img.Width / 2 – 1, imgBack.Width / 2 – img.Width / 2 –
1,1,1);//相片四周刷一层黑色边框
//g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);
g.DrawImage(img, imgBack.Width / 2 – img.Width / 2, imgBack.Width / 2 – img.Width / 2, img.Width, img.Height);
GC.Collect();
return imgBack;
}
//创建图层圆角
public static Image CreateRoundedCorner(Image image, string sDstFilePath, string sCornerLocation)
{
Graphics g = Graphics.FromImage(image);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);
GraphicsPath rectPath = CreateRoundRectanglePath(rect, image.Width / 10, sCornerLocation); //构建圆角外部路径
Brush b = new SolidBrush(Color.White);//圆角背景白色
g.DrawPath(new Pen(b), rectPath);
g.FillPath(b, rectPath);
g.Dispose();
//image.Save(sDstFilePath, ImageFormat.Png);
return image;
//image.Dispose();
}
//处理圆角 上下左右
private static GraphicsPath CreateRoundRectanglePath(Rectangle rect, int radius, string sPosition)
{
GraphicsPath rectPath = new GraphicsPath();
switch (sPosition)
{
case “TopLeft”:
{
rectPath.AddArc(rect.Left, rect.Top, radius * 2, radius * 2, 180, 90);
rectPath.AddLine(rect.Left, rect.Top, rect.Left, rect.Top + radius);
break;
}
case “TopRight”:
{
rectPath.AddArc(rect.Right – radius * 2, rect.Top, radius * 2, radius * 2, 270, 90);
rectPath.AddLine(rect.Right, rect.Top, rect.Right – radius, rect.Top);
break;
}
case “BottomLeft”:
{
rectPath.AddArc(rect.Left, rect.Bottom – radius * 2, radius * 2, radius * 2, 90, 90);
rectPath.AddLine(rect.Left, rect.Bottom – radius, rect.Left, rect.Bottom);
break;
}
case “BottomRight”:
{
rectPath.AddArc(rect.Right – radius * 2, rect.Bottom – radius * 2, radius * 2, radius * 2, 0, 90);
rectPath.AddLine(rect.Right – radius, rect.Bottom, rect.Right, rect.Bottom);
break;
}
}
return rectPath;
}
/// <summary>
/// Resize图片 裁剪
/// </summary>
/// <param name=”bmp”>原始Bitmap</param>
/// <param name=”newW”>新的宽度</param>
/// <param name=”newH”>新的高度</param>
/// <param name=”Mode”>保留着，暂时未用</param>
/// <returns>处理以后的图片</returns>
public static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
{
try
{
Image b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b);
// 插值算法的质量
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0,
bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose();
return b;
}
catch
{
return null;
}
}
//二维码解码
/// <summary>
/// 二维码解码
/// </summary>
/// <param name=”filePath”>图片路径</param>
/// <returns></returns>
public string CodeDecoder(string filePath)
{
if (!System.IO.File.Exists(filePath))
return null;
Bitmap myBitmap = new Bitmap(Image.FromFile(filePath));
QRCodeDecoder decoder = new QRCodeDecoder();
string decodedString = decoder.decode(new QRCodeBitmapImage(myBitmap));
return decodedString;
}
图片地址：http://imgsrc.baidu.com/image/c0%3Dshijue1%2C0%2C0%2C294%2C40/sign=729f32ebc9cec3fd9f33af36bee1be4a/fd039245d688d43f4c195ed5771ed21b0ef43b61.jpg
例子：http://192.168.2.228/api/Counselor/GetCodeImg?text=sb&imgurl=http://imgsrc.baidu.com/image/c0%3Dshijue1%2C0%2C0%2C294%2C40/sign=729f32ebc9cec3fd9f33af36bee1be4a/fd039245d688d43f4c195ed5771ed21b0ef43b61.jpg
调用api 生成图片如下
扫码即可得出text的内容