ByteScout Barcode Suite - C# - Read barcodes from live video cam (wpf) with barcode reader sdk - ByteScout

ByteScout Barcode Suite – C# – Read barcodes from live video cam (wpf) with barcode reader sdk

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How to read barcodes from live video cam (wpf) with barcode reader sdk in C# with ByteScout Barcode Suite

This code in C# shows how to read barcodes from live video cam (wpf) with barcode reader sdk with this how to tutorial

Source code documentation samples give simple and easy method to install a needed feature into your application. What is ByteScout Barcode Suite? It is the set that includes three different SDK products to generate barcodes, read barcodes and read and write spreadsheets: Barcode SDK, Barcode Reader SDK and Spreadsheet SDK. It can help you to read barcodes from live video cam (wpf) with barcode reader sdk in your C# application.

Want to quickly learn? This fast application programming interfaces of ByteScout Barcode Suite for C# plus the guidelines and the code below will help you quickly learn how to read barcodes from live video cam (wpf) with barcode reader sdk. This C# sample code is all you need for your app. Just copy and paste the code, add references (if needs to) and you are all set! Enjoy writing a code with ready-to-use sample C# codes.

Trial version of ByteScout Barcode Suite is available for free. Source code samples are included to help you with your C# app.

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App.xaml.cs
      
using System; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Linq; using System.Windows; namespace ReadFromVideoCamera.VS2010.WPF { /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { } }

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VideoScanForm.xaml.cs
      
using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Reflection; using System.Threading; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Threading; using Bytescout.BarCodeReader; using TouchlessLib; namespace ReadFromVideoCamera.VS2010.WPF { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { // Touchless lib manager object (to use it you should have TouchlessLib.dll and WebCamLib.dll) private TouchlessMgr _touchlessMgr; // USED IN POPUP MODE ONLY (see ShowScanPopup() method) // Close or not on the first barcode found // (results are saved in _foundBarcodes) public bool CloseOnFirstBarcodeFound { get; set; } // Indicates if the form is closed public bool IsClosed { get; set; } // Background processing object BackgroundWorker _backgroundWorker = new BackgroundWorker(); // Barcode type to scan private BarcodeTypeSelector _barcodeTypeToFind = new BarcodeTypeSelector(); // Array with decoded barcodes from the last scanning session public FoundBarcode[] FoundBarcodes { get; set; } // Scanning delay (ms); default is to scan every 800 ms. const int ScanDelay = 800; // Internal varaible to indicate the status. public static bool Status = true; public delegate void SimpleDelegate(); /// <summary> /// Creates the form. /// </summary> public MainWindow() { InitializeComponent(); lblScanning.Visibility = Visibility.Collapsed; _backgroundWorker.WorkerSupportsCancellation = true; _backgroundWorker.DoWork += BackgroundWorker_DoWork; _backgroundWorker.RunWorkerCompleted += BackgroundWorker_RunWorkerCompleted; } // Searches for barcodes in bitmap object private FoundBarcode[] FindBarcodes(Bitmap bitmap) { Reader reader = new Reader(); try { reader.RegistrationName = "demo"; reader.RegistrationKey = "demo"; this.Dispatcher.Invoke(DispatcherPriority.Normal, (SimpleDelegate) UpdateBarcodeTypeToFindFromCombobox); reader.BarcodeTypesToFind = _barcodeTypeToFind; //reader.MaxNumberOfBarcodesPerPage = 1; /* ----------------------------------------------------------------------- NOTE: We can read barcodes from specific page to increase performance. For sample please refer to "Decoding barcodes from PDF by pages" program. ----------------------------------------------------------------------- */ FoundBarcode[] result = reader.ReadFrom(bitmap); String timeNow = string.Format("{0:HH:mm:ss:tt}", DateTime.Now); this.Dispatcher.Invoke(DispatcherPriority.Normal, (SimpleDelegate) delegate { if (result != null && result.Length > 0) { textAreaBarcodes.SelectAll(); textAreaBarcodes.Selection.Text = "\nTime: " + timeNow + "\n"; // insert barcodes into text box foreach (FoundBarcode barcode in result) { // make a sound that we found the barcode Console.Beep(); // form the string with barcode value String barcodeValue = String.Format("Found: {0} {1}\n", barcode.Type, barcode.Value); // add barcode to the text area output textAreaBarcodes.AppendText(barcodeValue + "\n"); // add barcode to the list of saved barcodes lblFoundBarcodes.Content = String.Format("Found {0} barcodes:", result.Length); } } // make "Scanning..." label flicker lblScanning.Visibility = lblScanning.Visibility == Visibility.Collapsed ? Visibility.Visible : Visibility.Collapsed; lblScanning.UpdateLayout(); }); // return found barcodes return result; } finally { reader.Dispose(); } } private void Window_Loaded(object sender, RoutedEventArgs e) { // Populate barcode types into the combobox PopulateBarcodeTypesCombobox(); InitCamera(); StartDecoding(); } private void InitCamera() { try { // Create Touchless lib manager to work with video camera _touchlessMgr = new TouchlessMgr(); // Iterate through available video camera devices foreach (Camera camera in _touchlessMgr.Cameras) { // Add to list of available camera devices cbCamera.Items.Add(camera); } // Select first available camera cbCamera.SelectedItem = _touchlessMgr.Cameras[0]; // Setting default image dimensions; see also camera selection event. _touchlessMgr.Cameras[0].CaptureWidth = int.Parse(tbCameraWidth.Text); _touchlessMgr.Cameras[0].CaptureHeight = int.Parse(tbCameraHeight.Text); } catch (Exception ex) { MessageBox.Show("No video camera available. Please connect camera.\n" + ex.Message); } } public void StartDecoding() { UpdateCameraSelection(); // Clear the text box output TextRange txt = new TextRange(textAreaBarcodes.Document.ContentStart, textAreaBarcodes.Document.ContentEnd); txt.Text = ""; // Clean list of barcodes FoundBarcodes = null; // Check camera selected if (cbCamera.SelectedIndex != -1) { // Set status Status = true; // Update UI buttons btnStart.IsEnabled = false; btnStop.IsEnabled = true; cbBarCodeType.IsEnabled = false; cbCamera.IsEnabled = false; tbCameraHeight.IsEnabled = false; tbCameraWidth.IsEnabled = false; lblScanning.Content = "Scanning..."; // Start the decoding thread _backgroundWorker.RunWorkerAsync(CloseOnFirstBarcodeFound); } else { MessageBox.Show("Please select camera"); } } // Update picture box with the latest frame from video camera void CurrentCamera_OnImageCaptured(object sender, CameraEventArgs e) { // You can change image dimensions if needed //_touchlessMgr.CurrentCamera.CaptureWidth = 320; //_touchlessMgr.CurrentCamera.CaptureHeight = 240; Dispatcher.Invoke(DispatcherPriority.Normal, (SimpleDelegate) delegate { if (_touchlessMgr != null) { pictureVideoPreview.BeginInit(); BitmapImage imageSource = BitmapToImageSource(_touchlessMgr.CurrentCamera.GetCurrentImage(), ImageFormat.Png); ScaleTransform st = new ScaleTransform(); st.ScaleX = (double)320 / (double)imageSource.PixelWidth; st.ScaleY = (double)240 / (double)imageSource.PixelHeight; TransformedBitmap tb = new TransformedBitmap(imageSource, st); pictureVideoPreview.Source = tb; pictureVideoPreview.EndInit(); pictureVideoPreview.UpdateLayout(); } }); } // Convert System.Drawing.Bitmap to System.Windows.Media.Imaging.BitmapImage BitmapImage BitmapToImageSource(Bitmap bitmap, ImageFormat imageFormat) { using (MemoryStream memoryStream = new MemoryStream()) { bitmap.Save(memoryStream, imageFormat); memoryStream.Position = 0; BitmapImage bitmapImage = new BitmapImage(); bitmapImage.BeginInit(); bitmapImage.StreamSource = memoryStream; bitmapImage.CacheOption = BitmapCacheOption.OnLoad; bitmapImage.EndInit(); return bitmapImage; } } private void btnStart_Click(object sender, RoutedEventArgs e) { StartDecoding(); } private void btnStop_Click(object sender, RoutedEventArgs e) { StopDecoding(); } private void StopDecoding() { _backgroundWorker.CancelAsync(); // Update UI elements lblScanning.Visibility = Visibility.Collapsed; // Change working status Status = false; btnStart.IsEnabled = true; btnStop.IsEnabled = false; cbBarCodeType.IsEnabled = true; cbCamera.IsEnabled = true; tbCameraHeight.IsEnabled = true; tbCameraWidth.IsEnabled = true; if (CloseOnFirstBarcodeFound && FoundBarcodes != null && FoundBarcodes.Length > 0) Close(); } public void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e) { BackgroundWorker worker = (BackgroundWorker) sender; bool closeOnFirstBarcode = (bool) e.Argument; while (true) { // Work till user canceled the scan if (worker.CancellationPending) { e.Cancel = true; return; } // Get current frame bitmap from camera using Touchless lib Bitmap bitmap = _touchlessMgr.CurrentCamera.GetCurrentImage(); // Search barcodes FoundBarcode[] result = null; if (bitmap != null) result = FindBarcodes(bitmap); // Check if we need to stop on first barcode found if (closeOnFirstBarcode && result != null && result.Length > 0) { e.Result = result; return; // end processing } // Wait a little to lower CPU load Thread.Sleep(ScanDelay); } } private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { // Clear last results FoundBarcodes = null; if (e.Cancelled) { lblScanning.Content = "Canceled"; } else if (e.Error != null) { lblScanning.Content = "Error: " + e.Error.Message; } else { lblScanning.Content = "Done."; FoundBarcodes = (FoundBarcode[]) e.Result; } StopDecoding(); } private void cbCamera_SelectionChanged(object sender, SelectionChangedEventArgs e) { UpdateCameraSelection(); } private void UpdateCameraSelection() { if (cbCamera.Items.Count > 0 && cbCamera.SelectedIndex >-1) { if (_touchlessMgr.CurrentCamera != null) _touchlessMgr.CurrentCamera.OnImageCaptured -= CurrentCamera_OnImageCaptured; _touchlessMgr.CurrentCamera = null; Camera currentCamera = _touchlessMgr.Cameras[cbCamera.SelectedIndex]; // Setting camera output image dimensions currentCamera.CaptureWidth = int.Parse(tbCameraWidth.Text); currentCamera.CaptureHeight = int.Parse(tbCameraHeight.Text); _touchlessMgr.CurrentCamera = currentCamera; currentCamera.OnImageCaptured += CurrentCamera_OnImageCaptured; } } // Updates barcode type filter according with combobox selection private void UpdateBarcodeTypeToFindFromCombobox() { string selectedItemText = cbBarCodeType.Text; if (string.IsNullOrEmpty(selectedItemText)) throw new Exception("Empty barcode type selection."); _barcodeTypeToFind.Reset(); // Iterate through BarcodeTypeSelector bool properties // and enable property by barcode name selected in the combobox foreach (PropertyInfo propertyInfo in typeof(BarcodeTypeSelector).GetProperties()) { // Skip readonly properties if (!propertyInfo.CanWrite) continue; if (propertyInfo.Name == selectedItemText) propertyInfo.SetValue(_barcodeTypeToFind, true, null); } } protected void PopulateBarcodeTypesCombobox() { cbBarCodeType.Items.Clear(); List <string> items = new List<string>(); foreach (PropertyInfo propinfo in typeof(BarcodeTypeSelector).GetProperties()) { // Skip readonly properties if (!propinfo.CanWrite) continue; items.Add(propinfo.Name); } items.Sort(); cbBarCodeType.ItemsSource = items; // Select first item in combobox (first is "Find All") cbBarCodeType.SelectedItem = cbBarCodeType.Items[0]; } private void Window_Closing(object sender, CancelEventArgs e) { Deinitialize(); } private void Deinitialize() { // cancel decoding thread _backgroundWorker.CancelAsync(); // Deinit camera DeinitCamera(); // Mark as closed IsClosed = true; } private void btnExit_Click(object sender, RoutedEventArgs e) { Close(); } private void DeinitCamera() { if (_touchlessMgr != null) { _touchlessMgr.CurrentCamera.OnImageCaptured -= CurrentCamera_OnImageCaptured; _touchlessMgr.CurrentCamera = null; } if (cbCamera.SelectedItem != null) cbCamera.SelectedItem = null; cbCamera.Items.Clear(); _touchlessMgr = null; Thread.Sleep(500); } private void btnTryPopup_Click(object sender, RoutedEventArgs e) { // Stop scan if any StopDecoding(); // Deinit the current camera DeinitCamera(); ShowScanPopup(); // Reinit current camera InitCamera(); } private void ShowScanPopup() { // Create another MainWindow instance to scan barcodes MainWindow popup = new MainWindow(); // Set new popup position shifted by 20 pixels popup.Left = Left + 20; popup.Top = Top + 20; // Set the new popup window to close on first found barcode popup.CloseOnFirstBarcodeFound = true; // Hide btnTryPopup button popup.btnTryPopup.Visibility = Visibility.Hidden; popup.btnStop.Visibility = Visibility.Hidden; popup.btnStart.Visibility = Visibility.Hidden; // Set the popup title popup.Title = "POPUP DIALOG - ONE-TIME SCAN"; // Show the dialog popup.Show(); // Now wait while the popup is closed (it will be closed on barcode found or canceled) while (!popup.IsClosed) { // HACK: Simulate "DoEvents" Dispatcher.Invoke(DispatcherPriority.Background, new ThreadStart(delegate { })); Thread.Sleep(20); } // Checking if one-time scan dialog found barcodes if (popup.FoundBarcodes != null && popup.FoundBarcodes.Length > 0) MessageBox.Show("Popup scan found the barcode: \n" + popup.FoundBarcodes[0].Value, "POPUP RESULT"); else MessageBox.Show("Popup canceled. Returning to the main window"); // Close the dialog popup.Close(); } } }

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60 Day Free Trial or Visit ByteScout Barcode Suite Home Page

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ON-DEMAND REST WEB API

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