Winform 利用ThoughtWorks.QRCode 生成二维码,并另存为二维码图片(限制大小)

第一步首先：下载ThoughtWorks.QRCode.dll 放置到项目Bin目录下，然后右键项目添加引用；

第二步界面代码：

  #region Windows 窗体设计器生成的代码/// <summary>/// 设计器支持所需的方法 - 不要/// 使用代码编辑器修改此方法的内容。/// </summary>private void InitializeComponent(){this.groupBox1 = new System.Windows.Forms.GroupBox();this.textBox1 = new System.Windows.Forms.TextBox();this.button1 = new System.Windows.Forms.Button();this.button2 = new System.Windows.Forms.Button();this.label1 = new System.Windows.Forms.Label();this.textBox2 = new System.Windows.Forms.TextBox();this.pictureBox1 = new System.Windows.Forms.PictureBox();this.groupBox1.SuspendLayout();((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();this.SuspendLayout();// // groupBox1// this.groupBox1.Controls.Add(this.textBox1);this.groupBox1.Font = new System.Drawing.Font("宋体", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.groupBox1.Location = new System.Drawing.Point(0, 13);this.groupBox1.Name = "groupBox1";this.groupBox1.Size = new System.Drawing.Size(462, 84);this.groupBox1.TabIndex = 0;this.groupBox1.TabStop = false;this.groupBox1.Text = "产品地址";// // textBox1// this.textBox1.Location = new System.Drawing.Point(6, 23);this.textBox1.Multiline = true;this.textBox1.Name = "textBox1";this.textBox1.Size = new System.Drawing.Size(429, 44);this.textBox1.TabIndex = 0;// // button1// this.button1.Font = new System.Drawing.Font("宋体", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.button1.Location = new System.Drawing.Point(13, 225);this.button1.Name = "button1";this.button1.Size = new System.Drawing.Size(89, 38);this.button1.TabIndex = 2;this.button1.Text = "生成二维码";this.button1.UseVisualStyleBackColor = true;this.button1.Click += new System.EventHandler(this.button1_Click);// // button2// this.button2.Font = new System.Drawing.Font("宋体", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.button2.Location = new System.Drawing.Point(127, 225);this.button2.Name = "button2";this.button2.Size = new System.Drawing.Size(89, 37);this.button2.TabIndex = 3;this.button2.Text = "下载二维码";this.button2.UseVisualStyleBackColor = true;this.button2.Click += new System.EventHandler(this.button2_Click);// // label1// this.label1.AutoSize = true;this.label1.Font = new System.Drawing.Font("宋体", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.label1.Location = new System.Drawing.Point(13, 118);this.label1.Name = "label1";this.label1.Size = new System.Drawing.Size(77, 14);this.label1.TabIndex = 4;this.label1.Text = "产品名称：";// // textBox2// this.textBox2.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.textBox2.Location = new System.Drawing.Point(16, 149);this.textBox2.Multiline = true;this.textBox2.Name = "textBox2";this.textBox2.Size = new System.Drawing.Size(220, 43);this.textBox2.TabIndex = 5;// // pictureBox1// this.pictureBox1.Image = global::QRBarCode.Properties.Resources.a3fe94fc_f4e0_4f23_b3da_baeab3412ab01;this.pictureBox1.Location = new System.Drawing.Point(261, 118);this.pictureBox1.Name = "pictureBox1";this.pictureBox1.Size = new System.Drawing.Size(156, 145);this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;this.pictureBox1.TabIndex = 6;this.pictureBox1.TabStop = false;// // Form1// this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.ClientSize = new System.Drawing.Size(444, 306);this.Controls.Add(this.pictureBox1);this.Controls.Add(this.textBox2);this.Controls.Add(this.label1);this.Controls.Add(this.button2);this.Controls.Add(this.button1);this.Controls.Add(this.groupBox1);this.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.Name = "Form1";this.Text = "库买国际二维码图片生成";this.Load += new System.EventHandler(this.Form1_Load);this.groupBox1.ResumeLayout(false);this.groupBox1.PerformLayout();((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();this.ResumeLayout(false);this.PerformLayout();}#endregionprivate System.Windows.Forms.GroupBox groupBox1;private System.Windows.Forms.TextBox textBox1;private System.Windows.Forms.Button button1;private System.Windows.Forms.Button button2;private System.Windows.Forms.Label label1;private System.Windows.Forms.TextBox textBox2;private System.Windows.Forms.PictureBox pictureBox1;

第三步后台代码：

using ThoughtWorks.QRCode.Codec; 引用

  private void button1_Click(object sender, EventArgs e){ThoughtWorks.QRCode.Codec.QRCodeEncoder barcode = new QRCodeEncoder();barcode.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)barcode.QRCodeScale = 4;//大小(值越大生成的二维码图片像素越高)barcode.QRCodeVersion = 0;//版本(注意：设置为0主要是防止编码的字符串太长时发生错误)try{barcode.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)String qrdata = textBox1.Text.Trim();System.Drawing.Bitmap bp = barcode.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));// Image image = bp;pictureBox1.Image = bp;}catch //这个异常处理是放在输入内容太多造成数组溢出等异常{MessageBox.Show("生成失败，请点击重新生成.");}}private void button2_Click(object sender, EventArgs e){if (!string.IsNullOrEmpty(textBox2.Text)){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;//设置文件名称：sf.FileName = textBox2.Text + ".jpg";//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();if (sf.FileName != ""){string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);//获取文件名，不带路径string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("."));  //获取文件路径，带文件名,不带后缀//string fn = sf.FileName;Image img = new Bitmap(this.pictureBox1.Image, 60, 60);//另存为图片大小限制img.Save(FilePath + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);MessageBox.Show("保存成功"); }}}else{MessageBox.Show("请输入产品名称"); return;}}

效果图：

输入地址后生成的二维码效果

另存为二维码

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