winfrom编写二维码（可上传图片）
编写一个个人信息二维码：
首先先下载一个生成二维码的ThoughtWorks.QRCode.dll（注：下载后将其添加引用到项目中即可）
然后设计一个窗体：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;
namespace Two_dimensionCode
{
public partial class MyselfInfo : Form
{
public MyselfInfo()
{
InitializeComponent();
}
/// <summary>
/// /获取二维码
/// </summary>
/// <param name="write"></param>
/// <returns></returns>
public Bitmap GetCode(string write)
{
StringBuilder builder = new StringBuilder();
builder.Append("姓名：" + this.txtName);
QRCodeEncoder code = new QRCodeEncoder();
code.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
code.QRCodeScale = 4;
code.QRCodeVersion = 8;
code.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
Bitmap image = code.Encode(write);
return image;
}
///<summary>
///获取logo
///</summary>
///<returns></returns>
public Bitmap getlogo()
{
Bitmap newBmp = new Bitmap("logo.jpg");//获取图片对象
Bitmap bmp = new Bitmap(newBmp, 30, 30);//缩放
return bmp;
}
private object logoImg;//用于存放logo图片
/// <summary>
/// 生成
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnGenerate_Click(object sender, EventArgs e)
{
if (this.txtName.Text.Trim() != "")//验证输入的生成内容是否为空
{
Bitmap bCode = GetCode(this.txtName.Text);//获取二维码图片
if (logoImg == null)
{
pbCode.Image = bCode;
}
else
{
Bitmap bLogo = logoImg as Bitmap;//获取logo图片对象
bLogo = new Bitmap(bLogo, 30, 30);//改变图片的大小这里我们设置为30
int Y = bCode.Height;
int X = bCode.Width;
Point point = new Point(X / 2 - 15, Y / 2 - 15);//logo图片绘制到二维码上，这里将简单计算一下logo所在的坐标
Graphics g = Graphics.FromImage(bCode);//创建一个画布
g.DrawImage(bLogo, point);//将logo图片绘制到二维码图片上
pbCode.Image = bCode;
}
}
else
{
MessageBox.Show("输入生成内容！");
}
}
/// <summary>
/// 保存
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnSave_Click(object sender, EventArgs e)
{
SaveFileDialog saveFile = new SaveFileDialog();//创建保存对话框
saveFile.Filter = "JPEG|*.jpeg;*.jpg|位图文件|*.bmp|所有文件|*.*";//设置保存的图片格式
if (pbCode.Image != null)
{
if (saveFile.ShowDialog() == DialogResult.OK)
{
string sFilePathName = saveFile.FileName;
Image img = pbCode.Image;
img.Save(sFilePathName);
}
}
else
{
MessageBox.Show("请先生成二维码！");
}
}
/// <summary>
/// 上传Logo
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnLogo_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();//文件打开对话框
openFileDialog.Filter = "JPEG|*.jpeg;*.jpg|位图文件|*.bmp|所有文件|*.*";//只能打开我们设置的这几类文件
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
string fileName = openFileDialog.FileName;
Bitmap newBmp = new Bitmap(fileName);
Bitmap bmp = new Bitmap(newBmp);
pbCode.Image = bmp;
logoImg = bmp;
}
}
}
}
接下来创建一个QRCodeBuilder.cs类：
代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;
namespace TianQRCode
{
public class QRCodeBuilder
{
/// <summary>
/// 创建二维码图片
/// </summary>
/// <param name="codeStr">要产生二维码的字符串</param>
/// <returns>返回生成的Image</returns>
public Image CreateQRCode(string codeStr)
{
QRCodeEncoder encoder = new QRCodeEncoder();
encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式
encoder.QRCodeScale = 4;//大小
encoder.QRCodeVersion = 8;//版本
encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
System.Drawing.Bitmap bp = encoder.Encode(codeStr, Encoding.GetEncoding("GB2312"));
Image image = bp;
//保存二维码图片：
SaveFileDialog sf = new SaveFileDialog();
sf.Title = "选择保存文件位置";
sf.Filter = "保存图片(*.jpg) |*.jpg|所有文件(*.*) |*.*";
//设置默认文件类型显示顺序
sf.FilterIndex = 1;
//保存对话框是否记忆上次打开的目录
sf.RestoreDirectory = true;
if (sf.ShowDialog() == DialogResult.OK)
{
//获得文件路径
string localFilePath = sf.FileName.ToString();
image.Save(localFilePath);
}
return image;
}
}
}
