Important Update
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.
On-demand (REST Web API) version:
Web API (on-demand version)
On-premise offline SDK for Windows:
60 Day Free Trial (on-premise)
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
{
}
}
60 Day Free Trial or Visit ByteScout Barcode Suite Home Page
Explore ByteScout Barcode Suite Documentation
Explore Samples
Sign Up for ByteScout Barcode Suite Online Training
Get Your API Key
Explore Web API Docs
Explore Web API Samples
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();
}
}
}
60 Day Free Trial or Visit ByteScout Barcode Suite Home Page
Explore ByteScout Barcode Suite Documentation
Explore Samples
Sign Up for ByteScout Barcode Suite Online Training
Get Your API Key
Explore Web API Docs
Explore Web API Samples
60 Day Free Trial or Visit ByteScout Barcode Suite Home Page
Explore ByteScout Barcode Suite Documentation
Explore Samples
Sign Up for ByteScout Barcode Suite Online Training
Get Your API Key
Explore Web API Docs
Explore Web API Samples
also available as: