KeyUp Event (CaptureCtrl)

Occurs when the control has detected a KeyUp event.

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public new event KeyUpEventHandler KeyUp

'Declaration
 
Public Shadows Event KeyUp As KeyUpEventHandler

'Usage
 
Dim instance As CaptureCtrl
Dim handler As KeyUpEventHandler
 
AddHandler instance.KeyUp, handler

public new event KeyUpEventHandler KeyUp

add_KeyUp(function(sender, e))
remove_KeyUp(function(sender, e))

public:
new event KeyUpEventHandler^ KeyUp

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Public _result As Boolean = False
      Public _exit As Boolean = False
      Public _form As CaptureCtrlForm = New CaptureCtrlForm()
      Public Sub KeyPressesExample()
         Dim capturectrl As CaptureCtrl = _form.CaptureCtrl
         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_KeyPressesExample.avi")

         Try
            ' set a video device, use the name of your device here
            If capturectrl.VideoDevices("Analog") Is Nothing Then
               Throw New Exception("No Analog capture device available")
            End If

            capturectrl.VideoDevices("Analog").Selected = True

            ' select the MPEG4 video compressor
            capturectrl.VideoCompressors.Mpeg4.Selected = True

            ' set an audio device, use the name of your device here
            capturectrl.AudioDevices("USB").Selected = True

            ' enable preview
            capturectrl.Preview = True

            ' enable CC
            capturectrl.ClosedCaptioning = True

            ' set the target output file
            capturectrl.TargetFile = outFile

            ' subscribe to the key events
            AddHandler capturectrl.KeyDown, AddressOf KeyDown_Helper
            AddHandler capturectrl.KeyUp, AddressOf KeyUp_Helper
            AddHandler capturectrl.KeyPress, AddressOf KeyPress_Helper

            ' capture it now!
            capturectrl.StartCapture(CaptureMode.AutoFramesAndAudio)
         Catch e1 As Exception
            _result = False
         End Try

         ' we'll loop on the state and pump messages for this example.
         ' but you should not need to if running from a Windows Forms application.
         Do While _exit = False
            Application.DoEvents()
         Loop

         ' clean up event handlers
         RemoveHandler capturectrl.KeyDown, AddressOf KeyDown_Helper
         RemoveHandler capturectrl.KeyUp, AddressOf KeyUp_Helper
         RemoveHandler capturectrl.KeyPress, AddressOf KeyPress_Helper
      End Sub

      Private Sub KeyPress_Helper(ByVal sender As Object, ByVal e As Leadtools.Multimedia.KeyPressEventArgs)
         Select Case e.keyAscii
            Case CShort("p")
               ' toggle preview mode
               _form.CaptureCtrl.TogglePreview()
            Case CShort("f")
               ' toggle full screen mode
               _form.CaptureCtrl.ToggleFullScreenMode()
            Case CShort("c")
               ' toggle closed captioning
               _form.CaptureCtrl.ToggleClosedCaptioning()
            Case CShort("s")
               ' stop the capture and exit
               _form.CaptureCtrl.StopCapture()
               _exit = True
         End Select

         ' set result
         _result = True
      End Sub

      Private Sub KeyUp_Helper(ByVal sender As Object, ByVal e As KeyUpEventArgs)
         ' set result
         _result = True
      End Sub

      Public Sub KeyDown_Helper(ByVal sender As Object, ByVal e As KeyDownEventArgs)
         ' set result
         _result = True
      End Sub

Public NotInheritable Class LEAD_VARS
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media";
End Class

public bool _result = false;
      public bool _exit = false;
      public CaptureCtrlForm _form = new CaptureCtrlForm();
      public void KeyPressesExample()
      {
         CaptureCtrl capturectrl = _form.CaptureCtrl;
         string outFile = Path.Combine(LEAD_VARS.MediaDir,"CaptureCtrl_KeyPressesExample.avi");

         try
         {
            // set a video device, use the name of your device here
            if (capturectrl.VideoDevices["Analog"] == null)
               throw new Exception("No Analog capture device available");

            capturectrl.VideoDevices["Analog"].Selected = true;

            // select the MPEG4 video compressor
            capturectrl.VideoCompressors.Mpeg4.Selected = true;

            // set an audio device, use the name of your device here
            capturectrl.AudioDevices["USB"].Selected = true;

            // enable preview
            capturectrl.Preview = true;

            // enable CC
            capturectrl.ClosedCaptioning = true;

            // set the target output file
            capturectrl.TargetFile = outFile;

            // subscribe to the key events
            capturectrl.KeyDown += KeyDown_Helper;
            capturectrl.KeyUp += KeyUp_Helper;
            capturectrl.KeyPress += KeyPress_Helper;

            // capture it now!
            capturectrl.StartCapture(CaptureMode.AutoFramesAndAudio);
         }
         catch (Exception)
         {
            _result = false;
         }

         // we'll loop on the state and pump messages for this example.
         // but you should not need to if running from a Windows Forms application.
         while (_exit == false)
            Application.DoEvents();

         // clean up event handlers
         capturectrl.KeyDown -= KeyDown_Helper;
         capturectrl.KeyUp -= KeyUp_Helper;
         capturectrl.KeyPress -= KeyPress_Helper;
      }

      void KeyPress_Helper(object sender, Leadtools.Multimedia.KeyPressEventArgs e)
      {
         switch ((char)e.keyAscii)
         {
            case 'p':
               // toggle preview mode
               _form.CaptureCtrl.TogglePreview();
               break;
            case 'f':
               // toggle full screen mode
               _form.CaptureCtrl.ToggleFullScreenMode();
               break;
            case 'c':
               // toggle closed captioning
               _form.CaptureCtrl.ToggleClosedCaptioning();
               break;
            case 's':
               // stop the capture and exit
               _form.CaptureCtrl.StopCapture();
               _exit = true;
               break;
         }

         // set result
         _result = true;
      }

      void KeyUp_Helper(object sender, KeyUpEventArgs e)
      {
         // set result
         _result = true;
      }

      public void KeyDown_Helper(object sender, KeyDownEventArgs e)
      {
         // set result
         _result = true;
      }

static class LEAD_VARS
{
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media";
}

KeyUp Event (CaptureCtrl)

Reference