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

ByteScout Data Extraction 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# using ByteScout Data Extraction Suite

How to write a robust code in C# to read barcodes from live video cam (wpf) with barcode reader sdk with this step-by-step tutorial

We made thousands of pre-made source code pieces for easy implementation in your own programming projects. What is ByteScout Data Extraction Suite? It is the bundle that includes three SDK tools for data extraction from PDF, scans, images and from spreadsheets: PDF Extractor SDK, Data Extraction SDK, Barcode Reader SDK. It can help you to read barcodes from live video cam (wpf) with barcode reader sdk in your C# application.

This prolific sample source code in C# for ByteScout Data Extraction Suite contains various functions and other necessary options you should do calling the API to read barcodes from live video cam (wpf) with barcode reader sdk. Follow the instructions from scratch to work and copy the C# code. Use of ByteScout Data Extraction Suite in C# is also described in the documentation included along with the product.

ByteScout provides the free trial version of ByteScout Data Extraction Suite along with the documentation and source code samples.

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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 Data Extraction Suite Home Page

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ON-DEMAND REST WEB API

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