ShowDialogPreview Property

'Declaration
 
Public Overridable Property ShowDialogPreview As Boolean

Public _result As Boolean = False
      Public _form As CaptureCtrlForm = New CaptureCtrlForm()
      Public _capturectrl As CaptureCtrl = _form.CaptureCtrl
      Public Sub ShowDialogPreviewExample()
         ' reference the capture control
         _capturectrl = _form.CaptureCtrl

         ' output file names
         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ShowDialogPreviewExample.avi")

         Try
            ' set the source video device, select using your device name here
            If _capturectrl.VideoDevices("USB") Is Nothing Then
               Throw New Exception("No USB video device available")
            End If

            _capturectrl.VideoDevices("USB").Selected = True

            ' select video and audio compressors
            _capturectrl.VideoCompressors.Mpeg2.Selected = True

            ' set the target file and format
            _capturectrl.TargetFile = outFile
            _capturectrl.TargetFormat = TargetFormatType.AVI

            _capturectrl.FrameRate = 5 ' 5 frames per second
            _capturectrl.UseFrameRate = True
            _capturectrl.TimeLimit = 10 ' just 10 seconds of capture time
            _capturectrl.UseTimeLimit = True

            If _capturectrl.IsModeAvailable(CaptureMode.Video) Then

               ' set show dialog preview, the preview mode will be enabled when ShowDialog is invoked
               _capturectrl.ShowDialogPreview = True

               ' enable the preview
               _capturectrl.Preview = True

               ' subscribe to the started event
               AddHandler _capturectrl.Started, AddressOf CaptureCtrl_Started

               ' check the video capture dialog properties if available
               If _capturectrl.HasDialog(CaptureDlg.TargetFormat) Then
                  _capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form)
               End If

               ' start capture
               _capturectrl.StartCapture(CaptureMode.Video)

               ' get the show dialog preview
               Dim ShowDialogPreview As Boolean = _capturectrl.ShowDialogPreview

               ' set the result to what we expect
               _result = (ShowDialogPreview AndAlso _capturectrl.Preview)
            End If

         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 _capturectrl.State = CaptureState.Running
            Application.DoEvents()
         Loop
      End Sub

      Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs)
         ' stop the capture (we don't need a complete capture for this example)
         _capturectrl.StopCapture()
      End Sub

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