Login Login
MORE

WIDGETS

Widgets

Wanted articles
  • No information available
Who is online?
  • Nobody is logged in.
Article tools

CSharp:QRCode

From Aino Wiki

Jump to: navigation, search

QRCoder

E' una libreria gratuita che consente SOLO la generazione di QRCode, disponibile sotto NuGet.
Autore: Raffael Herrmann.

Esempio Completo

Segue il codice della classe main di una Windows application ad hoc.
Il QRCode generato viene inviato come bitmap ad un controllo di tipo System.Windows.Forms.PictureBox. Consente di scegliere tra divwerse tipologie di PlayLoad ovvero di tipi di QRCode destinati ciascuno ad uno scopo diverso.
Consente l'esportazione sia su File che su Clipboard.
NON E' UN ESEMPIO COMPLETO ma è a scopo didattico. 

using QRCoder;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using static QRCoder.PayloadGenerator;
 
namespace QRCode_Gen
{
    public partial class FrmMain : Form
    {
        private bool m_FormLoaded = false;
        private Bitmap m_qrCodeImage;
 
        private Dictionary<string, string> m_dctCmbBoxPlayloadType = new Dictionary<string, string>();
        private Dictionary<string, string> m_dctCmbBoxFileDataType = new Dictionary<string, string>();
        private Dictionary<string, PictureBoxSizeMode> m_dctCmbBoxPictureSizeMode = new Dictionary<string, PictureBoxSizeMode>();
 
        public FrmMain()
        {
            InitializeComponent();
        }
 
        private void FrmMain_Load(object sender, EventArgs e)
        {
            try
            {
                Populate_CmbBox_PlayLoadType();
                Populate_CmbBox_SaveFileType();
                Populate_CmbBox_PictureSizeMode(PictureBoxSizeMode.StretchImage.ToString());
                CmbBox_ImageFormat.Text = "Bmp";
 
                m_FormLoaded = true;
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "FrmMain_Load. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
 
        #region Main Event Handlers
        private void BtnGeneteQR_Click(object sender, EventArgs e)
        {
            string txtToBeEncoded = string.Empty;
            string payload = string.Empty;
            int pixelsPerModule = 0;
            try
            {
                txtToBeEncoded = RTxt_Totranslate.Text;
                pixelsPerModule = int.Parse(TxtPixelsPerModule.Text);
                string playLoadSelect = ((KeyValuePair<string, string>)CmbBox_PlayloadType.SelectedItem).Key;
 
                QRCodeGenerator qrGenerator = new QRCodeGenerator();
                QRCodeData qrCodeData;
 
                switch (playLoadSelect)
                {
                    case "bookmark":
                        string title = TxtExtraInfo1.Text.Trim();
                        //"http://code-bude.net"
                        Bookmark generatorBookmark = new Bookmark(txtToBeEncoded, title);
                        payload = generatorBookmark.ToString();
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "calendarEvent":
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "contactData":
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "geolocation":
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "email":
                        string emailSubject = txtToBeEncoded;
                        string emailObject = TxtExtraInfo2.Text;
                        string emailAddress = LblExtraInfo1.Text;
                        Mail generatorMail = new Mail(emailAddress, emailObject, emailSubject);
                        payload = generatorMail.ToString();
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "mms":
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "url":
                        Url generator = new Url(txtToBeEncoded);
                        payload = generator.ToString();
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "sms":
                        string phoneNumber = TxtExtraInfo1.Text.Trim(); //Es.:  +393478165901
                        SMS generatorSMS = new SMS(phoneNumber, txtToBeEncoded);
                        payload = generatorSMS.ToString();
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    case "wifi":
                        WiFi generatorWiFi = new WiFi(txtToBeEncoded, TxtExtraInfo1.Text.Trim(), WiFi.Authentication.WPA);
                        payload = generatorWiFi.ToString();
                        qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
                        break;
                    default:
                        //= "default"
                        qrCodeData = qrGenerator.CreateQrCode(txtToBeEncoded, QRCodeGenerator.ECCLevel.Q);
                        break;
                }
 
                QRCode qrCode = new QRCode(qrCodeData);
                m_qrCodeImage = qrCode.GetGraphic(pixelsPerModule);
 
                SetQRCodePictureSizeMode();
                PctBx_QRCode.Image = m_qrCodeImage;
                RTxt_Log.Text += string.Format("\r\nTesto generato: \"{0}\"\r\nPixelPerModulo: {1}\r\n"
                                        , txtToBeEncoded, pixelsPerModule);
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "BtnGeneteQR_Click. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            /* Original code:
                QRCodeData qrCodeData = qrGenerator.CreateQrCode(txtToBeEncoded
                                                                , QRCodeGenerator.ECCLevel.Q);
                QRCode qrCode = new QRCode(qrCodeData);
                Bitmap qrCodeImage = qrCode.GetGraphic(20);
            ------------------info---------------------
            QRCodeGenerator.ECCLevel        The error correction level. 
                                            Either L (7%), M (15%), Q (25%) or H (30%). 
                                            Tells how much of the QR Code can get corrupted before the code 
                                            isn't readable any longer.
             */
        }
 
        private void CmbBox_PlayloadType_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                LblMainText.Text = "Testo da tradurre:";
                RTxt_Totranslate.Text = string.Empty;
                LblExtraInfo1.Visible = false;
                LblExtraInfo2.Visible = false;
                TxtExtraInfo1.Visible = false;
                TxtExtraInfo2.Visible = false;
 
                string playLoadSelect = ((KeyValuePair<string, string>)CmbBox_PlayloadType.SelectedItem).Key;
                switch (playLoadSelect)
                {
                    case "bookmark":
                        LblExtraInfo1.Visible = true;
                        LblExtraInfo2.Visible = false;
                        TxtExtraInfo1.Visible = true;
                        TxtExtraInfo2.Visible = false;
 
                        LblMainText.Text = "URL:";
                        LblExtraInfo1.Text = "Descrizione bookmark:";
                        RTxt_Totranslate.Text = "http://";
                        break;
                    case "calendarEvent":
                        MessageBox.Show("Non ancora implementato", "CmbBox_PlayloadType_SelectedIndexChanged"
                                , MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    case "contactData":
                        MessageBox.Show("Non ancora implementato", "CmbBox_PlayloadType_SelectedIndexChanged"
                                , MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    case "geolocation":
                        MessageBox.Show("Non ancora implementato", "CmbBox_PlayloadType_SelectedIndexChanged"
                                , MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    case "email":
                        LblExtraInfo1.Visible = true;
                        LblExtraInfo2.Visible = true;
                        TxtExtraInfo1.Visible = true;
                        TxtExtraInfo2.Visible = true;
 
                        LblMainText.Text = "Testo della e-mail:";
                        LblExtraInfo1.Text = "e-mail:"; //Receiver-Destinatario
                        LblExtraInfo2.Text = "Oggetto:";
                        break;
                    case "mms":
                        MessageBox.Show("Non ancora implementato", "CmbBox_PlayloadType_SelectedIndexChanged"
                                , MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    case "url":
                        RTxt_Totranslate.Text = "https://";
                        break;
                    case "sms":
                        LblMainText.Text = "Testo SMS:";
                        LblExtraInfo1.Visible = true;
                        TxtExtraInfo1.Visible = true;
                        LblExtraInfo1.Text = "Cell. dest.:";                        
                        break;
                    case "wifi":
                        LblMainText.Text = "WiFi SSID:";
                        LblExtraInfo1.Visible = true;
                        LblExtraInfo1.Text = "WiFi pw:";
                        TxtExtraInfo1.Visible = true;
                        break;
                    default:
                        break;
                }
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "CmbBox_PlayloadType_SelectedIndexChanged. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
 
        private void BtnToBmp_Click(object sender, EventArgs e)
        {
            try
            {
                string txtToBeEncoded = RTxt_Totranslate.Text;
                string imageFormat = ((KeyValuePair<string, string>)CmbBox_ImageFormat.SelectedItem).Key;
 
                switch (imageFormat)
                {
                    case "jpeg":
                        break;
                    case "png":
                        break;
                    case "bmp":
                        break;
                    case "gif":
                        break;
                    default:
                        break;
                }
 
                txtToBeEncoded = txtToBeEncoded.Replace(" ", "_");
                SaveFileDialog dialog = new SaveFileDialog();
                dialog.Title = "Scegli dove salvare il QR Code generato";
                dialog.InitialDirectory = "D:\\Documenti";
                dialog.DefaultExt = "." + imageFormat;
                dialog.FileName = string.Format("{0}.{1}", txtToBeEncoded, imageFormat);
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    m_qrCodeImage.Save(dialog.FileName, ImageFormat.Jpeg); //Jpeg
                    Clipboard.SetImage(m_qrCodeImage);
                    RTxt_Log.Text += string.Format("Salvato il file: {0}\r\n"
                                                , dialog.FileName);
                }
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "BtnToBmp_Click. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
 
        private void LblTextToTranslate_Click(object sender, EventArgs e)
        {
            PctBx_QRCode.Image = null;
        }
 
        private void Btn_QR2Clipboard_Click(object sender, EventArgs e)
        {
            try
            {
                string txtToBeEncoded = RTxt_Totranslate.Text;
                Clipboard.SetImage(m_qrCodeImage);
                RTxt_Log.Text += string.Format("QR code per {0} è in Clipboard\r\n"
                                            , txtToBeEncoded);
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "Btn_QR2Clipboard_Click. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
 
        private void BtnReset_Click(object sender, EventArgs e)
        {
            RTxt_Totranslate.Text = string.Empty;
            TxtExtraInfo1.Text = string.Empty;
            TxtExtraInfo2.Text = string.Empty;
            PctBx_QRCode.Image = null;
            CmbBox_PlayloadType.SelectedIndex = 0;
            CmbBox_ImageFormat.Text = "Bmp";
        }
 
        private void CmbBox_PictureSizeMode_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                if (m_FormLoaded)
                {
                    SetQRCodePictureSizeMode();
                }
            }
            catch (Exception ex)
            {
                RTxt_Log.Text += string.Format("\r\n{0}", ex.Message);
                MessageBox.Show(ex.Message, "CmbBox_PictureSizeMode_SelectedIndexChanged. Error"
                                , MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        #endregion
 
        #region Private methods
        private void Populate_CmbBox_PlayLoadType()
        {
            m_dctCmbBoxPlayloadType.Add("default", "Default");
            m_dctCmbBoxPlayloadType.Add("bookmark", "Bookmark");
            m_dctCmbBoxPlayloadType.Add("calendarEvent", "CalendarEvent");
            m_dctCmbBoxPlayloadType.Add("contactData", "ContactData");
            m_dctCmbBoxPlayloadType.Add("geolocation", "Geolocation");
            m_dctCmbBoxPlayloadType.Add("email", "Email");
            m_dctCmbBoxPlayloadType.Add("mms", "MMS");
            m_dctCmbBoxPlayloadType.Add("url", "URL");
            m_dctCmbBoxPlayloadType.Add("sms", "SMS");
            m_dctCmbBoxPlayloadType.Add("wifi", "WiFi");
 
            BindingSource bndSrcCmbPlayloadType = new BindingSource();
 
            bndSrcCmbPlayloadType.DataSource = m_dctCmbBoxPlayloadType;
            CmbBox_PlayloadType.DataSource = bndSrcCmbPlayloadType;
            CmbBox_PlayloadType.DisplayMember = "Key";
            CmbBox_PlayloadType.ValueMember = "Value";            
        }
 
        private void Populate_CmbBox_SaveFileType()
        {
            m_dctCmbBoxFileDataType.Add("jpeg", "Jpeg");
            m_dctCmbBoxFileDataType.Add("png", "Png");
            m_dctCmbBoxFileDataType.Add("bmp", "Bmp");
            m_dctCmbBoxFileDataType.Add("gif", "Gif");
 
            BindingSource bndSrcCmbDBFileDataType = new BindingSource();
 
            bndSrcCmbDBFileDataType.DataSource = m_dctCmbBoxFileDataType;
            CmbBox_ImageFormat.DataSource = bndSrcCmbDBFileDataType;
            CmbBox_ImageFormat.DisplayMember = "Key";
            CmbBox_ImageFormat.ValueMember = "Value";
        }
        private void Populate_CmbBox_PictureSizeMode(string defaultKeyText = "")
        {
            m_dctCmbBoxPictureSizeMode.Add("Normal", PictureBoxSizeMode.Normal);
            m_dctCmbBoxPictureSizeMode.Add("StretchImage", PictureBoxSizeMode.StretchImage);
            m_dctCmbBoxPictureSizeMode.Add("AutoSize", PictureBoxSizeMode.AutoSize);
            m_dctCmbBoxPictureSizeMode.Add("CenterImage", PictureBoxSizeMode.CenterImage);
            m_dctCmbBoxPictureSizeMode.Add("Zoom", PictureBoxSizeMode.Zoom);
 
            BindingSource bndSrcCmbPictureSizeMode = new BindingSource();
 
            bndSrcCmbPictureSizeMode.DataSource = m_dctCmbBoxPictureSizeMode;
            CmbBox_PictureSizeMode.DataSource = bndSrcCmbPictureSizeMode;
            CmbBox_PictureSizeMode.DisplayMember = "Key";
            CmbBox_PictureSizeMode.ValueMember = "Value";
            if (defaultKeyText != string.Empty)
            {
                int i =  Array.IndexOf(m_dctCmbBoxPictureSizeMode.Keys.ToArray(), defaultKeyText);
                CmbBox_PictureSizeMode.SelectedIndex = i;
            }
        }
 
        private void SetQRCodePictureSizeMode()
        {
            PictureBoxSizeMode sizeMode = ((KeyValuePair<string, PictureBoxSizeMode>)CmbBox_PictureSizeMode.SelectedItem).Value;
 
            PctBx_QRCode.SizeMode = sizeMode;
 
            RTxt_Log.Text += string.Format("\r\nImpostato SizeMode: {0}", sizeMode.ToString());
        }
        #endregion
    }
}

etc

using System;

private void Prova()
{
    for (int i = 0; i < 4; i++)
    {
        // Commento
    }
}

Mappa e Link

C# | Librerie di terze parti PlugIn

Visual Studio | MS SQL | Dizionario

Parole chiave:

Retrieved from "http://wiki.aino.it/index.php?title=CSharp:QRCode&oldid=7483"
Author
Giuseppe AINO