How to generate a QR code using. NET and a QR code using. NET

How to generate a QR code using. NET and a QR code using. NET

The following describes how to generate a QR Code using. NET. The detailed steps are as follows:

1. Create a window application and introduce the. net qr code library (open-source class library can be downloaded from the Internet ):

2. Build the UI with the following code:

Namespace WinQRCode {partial class Form1 {/// <summary> /// a required designer variable. /// </Summary> private System. ComponentModel. IContainer components = null; // <summary> /// clear all resources in use. /// </Summary> /// <param name = "disposing"> true if the managed resource should be released; otherwise, false. </Param> protected override void Dispose (bool disposing) {if (disposing & (components! = Null) {components. dispose ();} base. dispose (disposing );} # region Windows Form Designer generated code /// <summary> /// the designer supports the required methods-do not // use the code editor to modify the content of this method. /// </Summary> private void InitializeComponent () {this. button1 = new System. windows. forms. button (); this. button2 = new System. windows. forms. button (); this. pictureBox1 = new System. windows. forms. pictureBox (); this. label1 = new System. windows. forms. label (); this. textBox1 = new System. windows. forms. textBox (); this. label2 = new System. windows. forms. label (); this. lbl decoding information = new System. windows. forms. label (); (System. componentModel. ISupportInitialize) (this. pictureBox1 )). beginInit (); this. suspendLayout (); // button1 // this. button1.Location = new System. drawing. point (446, 31); this. button1.Margin = new System. windows. forms. padding (4, 5, 4, 5); this. button1.Name = "button1"; this. button1.Size = new System. drawing. size (103, 37); this. button1.TabIndex = 0; this. button1.Text = "encoding"; this. button1.UseVisualStyleBackColor = true; this. button1.Click + = new System. eventHandler (this. button#click); // button2 // this. button2.Location = new System. drawing. point (446, 81); this. button2.Margin = new System. windows. forms. padding (4, 5, 4, 5); this. button2.Name = "button2"; this. button2.Size = new System. drawing. size (103, 37); this. button2.TabIndex = 1; this. button2.Text = "decoding"; this. button2.UseVisualStyleBackColor = true; this. button2.Click + = new System. eventHandler (this. button2_Click); // pictureBox1 // this. pictureBox1.Location = new System. drawing. points (23,117); this. pictureBox1.Margin = new System. windows. forms. padding (4, 5, 4, 5); this. pictureBox1.Name = "pictureBox1"; this. pictureBox1.Size = new System. drawing. size (279,253); this. pictureBox1.SizeMode = System. windows. forms. pictureBoxSizeMode. stretchImage; this. pictureBox1.TabIndex = 2; this. pictureBox1.TabStop = false; // label1 // this. label1.AutoSize = true; this. label1.Location = new System. drawing. point (18, 39); this. label1.Margin = new System. windows. forms. padding (4, 0, 4, 0); this. label1.Name = "label1"; this. label1.Size = new System. drawing. size (69, 25); this. label1.TabIndex = 3; this. label1.Text = "information:"; // textBox1 // this. textBox1.Location = new System. drawing. point (95, 37); this. textBox1.Margin = new System. windows. forms. padding (4, 5, 4, 5); this. textBox1.Name = "textBox1"; this. textBox1.Size = new System. drawing. size (333, 31); this. textBox1.TabIndex = 4; // label2 // this. label2.AutoSize = true; this. label2.Location = new System. drawing. point (18, 81); this. label2.Margin = new System. windows. forms. padding (4, 0, 4, 0); this. label2.Name = "label2"; this. label2.Size = new System. drawing. size (88, 25); this. label2.TabIndex = 5; this. label2.Text = "QR code:"; // lbl decoding information // this. lbl decoding information. autoSize = true; this. lbl decoding information. location = new System. drawing. point (101, 81); this. lbl decoding information. margin = new System. windows. forms. padding (4, 0, 4, 0); this. lbl decoding information. name = "lbl decoding information"; this. lbl decoding information. size = new System. drawing. size (0, 25); this. lbl decoding information. tabIndex = 6; // Form1 // this. autoScaleDimensions = new System. drawing. sizeF (11F, 24F); this. autoScaleMode = System. windows. forms. autoScaleMode. font; this. clientSize = new System. drawing. size (572,384); this. controls. add (this. lbl decoding information); this. controls. add (this. label2); this. controls. add (this. textBox1); this. controls. add (this. label1); this. controls. add (this. pictureBox1); this. controls. add (this. button2); this. controls. add (this. button1); this. font = new System. drawing. font ("", 10.8F, System. drawing. fontStyle. regular, System. drawing. graphicsUnit. point, (byte) (134); this. margin = new System. windows. forms. padding (4, 5, 4, 5); this. name = "Form1"; this. text = "QR code"; (System. componentModel. ISupportInitialize) (this. pictureBox1 )). endInit (); this. resumeLayout (false); this. extends mlayout () ;}# endregion private System. windows. forms. button button1; private System. windows. forms. button button2; private System. windows. forms. pictureBox pictureBox1; private System. windows. forms. label label1; private System. windows. forms. textBox textBox1; private System. windows. forms. label label2; private System. windows. forms. label lbl decoding information ;}}

The figure is as follows:

 

3. Write encoding and decoding button events for encoding and decoding:

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; namespace WinQRCode {using ThoughtWorks. QRCode. codec; using ThoughtWorks. QRCode. codec. data; using ThoughtWorks. QRCode. codec. util; using System. IO; using implements toimage; public partial class Form1: Form {public Form1 () {InitializeComponent ();} /// <summary> /// encoding /// </summary> /// <param name = "sender"> </param> /// <param name =" e "> </param> private void button#click (object sender, eventArgs e) {if (this. textBox1.Text! = "") {Cursor. current = Cursors. waitCursor; if (textBox1.Text. trim () = String. empty) {MessageBox. show ("cannot be blank. "); return;} QRCodeEncoder qrCodeEncoder = new QRCodeEncoder (); qrCodeEncoder. QRCodeEncodeMode = QRCodeEncoder. ENCODE_MODE.BYTE; qrCodeEncoder. QRCodeScale = 4; qrCodeEncoder. QRCodeVersion = 7; qrCodeEncoder. QRCodeErrorCorrect = QRCodeEncoder. ERROR_CORRECTION.M; System. drawing. image image; String data = textBox1.Text; // encoded image = qrCodeEncoder. encode (data); // The image displays this. pictureBox1.Image = image; Cursor. current = Cursors. default ;}} /// <summary> /// decoding /// </summary> /// <param name = "sender"> </param> /// <param name =" e "> </param> private void button2_Click (object sender, eventArgs e) {Cursor. current = Cursors. waitCursor; Bitmap B = this. pictureBox1.Image as Bitmap; try {QRCodeDecoder decoder = new QRCodeDecoder (); // decodes String decodedString = decoder. decode (new QRCodeBitmapImage (B); // display the decoding information this. lbl decoding information. text + = decodedString;} catch (Exception ex) {MessageBox. show (ex. message);} Cursor. current = Cursors. default;} private void Form1_Load (object sender, EventArgs e ){}}}

4. Compile and run the program, for example:

The above is the general idea of using. NET to generate a QR code. There are still many shortcomings. I hope you can give more suggestions or make innovative modifications on your own.