ShowDialogPreview Property

C#
Visual Basic
Objective-C
Java
C++

public virtual bool ShowDialogPreview {get; set;}

'Declaration

Public Overridable Property ShowDialogPreview As Boolean

'Usage

Dim instance As CaptureCtrl
Dim value As Boolean
 
instance.ShowDialogPreview = value
 
value = instance.ShowDialogPreview

public:
virtual property bool ShowDialogPreview {
   bool get();
   void set (    bool value);
}

Property Value

true if the preview will continue displaying during ShowDialog calls; otherwise, it is false.

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

Copy Code

Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures

Public _result As Boolean = False
Public _form As New CaptureCtrlForm()
' capture control
Private capturectrl As CaptureCtrl

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

Public Sub ShowDialogPreviewExample()
    ' reference the capture control
    capturectrl = _form.CaptureCtrl

    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

        ' set the target file and format
        capturectrl.TargetFile = outFile
        capturectrl.TargetFormat = TargetFormatType.MP4

        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 generatedExceptionName As COMException
        _result = False
    Catch generatedExceptionName As Exception
        _result = False
    End Try
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 19\Media"
End Class

using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
// capture control
CaptureCtrl capturectrl;

// output file
string outFile = Path.Combine(LEAD_VARS.MediaDir,"CaptureCtrl_ShowDialogPreviewExample.avi");

public void ShowDialogPreviewExample()
{
   // reference the capture control
   capturectrl = _form.CaptureCtrl;

   try
   {
      // set the source video device, select using your device name here
      if (capturectrl.VideoDevices["USB"] == null)
      {
         throw new Exception("No USB video device available");
      }

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

      // set the target file and format
      capturectrl.TargetFile = outFile;
      capturectrl.TargetFormat = TargetFormatType.MP4;

      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))
      {
         // 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
         capturectrl.Started += CaptureCtrl_Started;

         // check the video capture dialog properties if available
         if (capturectrl.HasDialog(CaptureDlg.TargetFormat))
         {
            capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form);
         }

         // start capture
         capturectrl.StartCapture(CaptureMode.Video);

         // get the show dialog preview
         bool ShowDialogPreview = capturectrl.ShowDialogPreview;

         // set the result to what we expect
         _result = (ShowDialogPreview && capturectrl.Preview);
      }

   }
   catch (COMException)
   {
      _result = false;
   }
   catch (Exception)
   {
      _result = false;
   }
}

void CaptureCtrl_Started(object sender, EventArgs e)
{
   // stop the capture (we don't need a complete capture for this example)
   capturectrl.StopCapture();
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media";
}

Target Platforms

Reference

CaptureCtrl Class
CaptureCtrl Members