Open Source QRCode Library

��using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Imaging;



using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

using ThoughtWorks.QRCode.Codec.Util;



namespace QRCodeSample

{

    public partial class QrCodeSampleApp : Form

    {

        public QrCodeSampleApp()

        {

            InitializeComponent();

        }



        private void frmSample_Load(object sender, EventArgs e)

        {

            cboEncoding.SelectedIndex = 2;

            cboVersion.SelectedIndex = 6;

            cboCorrectionLevel.SelectedIndex = 1;

           

        }



     

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)

        {

            Application.Exit();

        }



        private void btnEncode_Click_1(object sender, EventArgs e)

        {

            if (txtEncodeData.Text.Trim() == String.Empty)

            {

                MessageBox.Show("Data must not be empty.");

                return;

            }

            

            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

            String encoding = cboEncoding.Text ;

            if (encoding == "Byte") {

                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

            } else if (encoding == "AlphaNumeric") {

                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;            

            } else if (encoding == "Numeric") {

                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;            

            }

            try {

                int scale = Convert.ToInt16(txtSize.Text);

                qrCodeEncoder.QRCodeScale = scale;

            } catch (Exception ex) {

                MessageBox.Show("Invalid size!");

                return;

            }

            try {

                int version = Convert.ToInt16(cboVersion.Text) ;

                qrCodeEncoder.QRCodeVersion = version;

            } catch (Exception ex) {

                MessageBox.Show("Invalid version !");

            }



            string errorCorrect = cboCorrectionLevel.Text;

            if (errorCorrect == "L")

                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;

            else if (errorCorrect == "M")

                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

            else if (errorCorrect == "Q")

                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;

            else if (errorCorrect == "H")

                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;



            Image image;

            String data = txtEncodeData.Text;

            image = qrCodeEncoder.Encode(data);                      

            picEncode.Image = image;

        }



        private void btnSave_Click(object sender, EventArgs e)

        {

            saveFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png";

            saveFileDialog1.Title = "Save";

            saveFileDialog1.FileName = string.Empty;

            saveFileDialog1.ShowDialog();



            // If the file name is not an empty string open it for saving.

            if (saveFileDialog1.FileName != "")

            {

                // Saves the Image via a FileStream created by the OpenFile method.

                System.IO.FileStream fs =

                   (System.IO.FileStream)saveFileDialog1.OpenFile();

                // Saves the Image in the appropriate ImageFormat based upon the

                // File type selected in the dialog box.

                // NOTE that the FilterIndex property is one-based.

                switch (saveFileDialog1.FilterIndex)

                {

                    case 1:

                        this.picEncode.Image.Save(fs,

                           System.Drawing.Imaging.ImageFormat.Jpeg);

                        break;



                    case 2:

                        this.picEncode.Image.Save(fs,

                           System.Drawing.Imaging.ImageFormat.Bmp);

                        break;



                    case 3:

                        this.picEncode.Image.Save(fs,

                           System.Drawing.Imaging.ImageFormat.Gif);

                        break;

                    case 4:

                        this.picEncode.Image.Save(fs,

                           System.Drawing.Imaging.ImageFormat.Png);

                        break;

                }



                fs.Close();

            }



            //openFileDialog1.InitialDirectory = "c:\\";

            //openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";

            //openFileDialog1.FilterIndex = 2;

            //openFileDialog1.RestoreDirectory = true;



            //if (openFileDialog1.ShowDialog() == DialogResult.OK)

            //{

            //    MessageBox.Show(openFileDialog1.FileName); 

            //}



        }

        private void btnPrint_Click(object sender, EventArgs e)

        {

            printDialog1.Document = printDocument1 ;

            DialogResult r = printDialog1.ShowDialog();

            if ( r == DialogResult.OK ) {

                printDocument1.Print();

            }            

        }



        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

        {

            e.Graphics.DrawImage(picEncode.Image,0,0);          

        }



        private void btnOpen_Click(object sender, EventArgs e)

        {

            //openFileDialog1.InitialDirectory = "c:\\";

            openFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png|All files (*.*)|*.*";

            openFileDialog1.FilterIndex = 1;

            openFileDialog1.RestoreDirectory = true;

            openFileDialog1.FileName = string.Empty;



            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                String fileName = openFileDialog1.FileName;               

                picDecode.Image = new Bitmap(fileName);

                

            }

        }



        private void btnDecode_Click_1(object sender, EventArgs e)

        {           

            try

            {                

                QRCodeDecoder decoder = new QRCodeDecoder();

                //QRCodeDecoder.Canvas = new ConsoleCanvas();

                String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(picDecode.Image)));

                txtDecodedData.Text = decodedString;

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }

        }

     

     }

}