PreviewVisible Property

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Property PreviewVisible As Boolean

'Usage
 
Dim instance As ConvertCtrl
Dim value As Boolean
 
instance.PreviewVisible = value
 
value = instance.PreviewVisible

public virtual bool PreviewVisible {get; set;}

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

Property Value

true if Preview is visible; otherwise, it is false.

To preview video during conversion, this property and the Preview property must both be set to true.

If the property fails, an error is raised. For more information, refer to the Error Codes.

Note: When setting this property, the convert control must be in the stopped state.

Visual Basic
C#
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 ConvertCtrlForm = New ConvertCtrlForm()
Public Sub HasDialogExample()
   ' reference the convert control
   Dim convertctrl As ConvertCtrl = _form.ConvertCtrl

   ' input and output files
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi")
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_HasDialogExample.wmv")

   Try
      ' set the source for conversion
      convertctrl.SourceFile = inFile

      ' select WMV target format
      convertctrl.TargetFormat = TargetFormatType.WMV

      ' select video and audio target formats for the output
      Dim index As Integer = -1
      Dim trgvideoformats As TargetVideoFormats = convertctrl.TargetFormats(convertctrl.TargetFormat).VideoFormats
      index = trgvideoformats.IndexOf("{33564D57-0000-0010-8000-00AA00389B71}") ' Windows Media Video 9 (WMV)
      trgvideoformats.Selection = index
      Dim trgaudioformats As TargetAudioFormats = convertctrl.TargetFormats(convertctrl.TargetFormat).AudioFormats
      index = trgaudioformats.IndexOf("{00000161-0000-0010-8000-00AA00389B71}") ' Windows Media Audio (WMA)
      trgaudioformats.Selection = index

      ' set the target output file and format
      convertctrl.TargetFile = outFile

      ' The HasDialog method tells us that the control
      ' can display the desired settings dialog.
      ' check to see if the convert source dialog is available
      If convertctrl.HasDialog(ConvertDlg.TargetFormat) Then
         ' now show it
         convertctrl.ShowDialog(ConvertDlg.TargetFormat, _form)
         _result = True
      End If

      ' start the capture process
      convertctrl.StartConvert()

      ' 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 convertctrl.State = ConvertState.Running
         Application.DoEvents()
      Loop

      ' see if there was an error
      If convertctrl.ConvertError <> 0 Then
         ' set the result to false
         _result = False
      End If
   Catch e1 As Exception
      _result = False
   End Try
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media"
End Class

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

public bool _result = false;
public ConvertCtrlForm _form = new ConvertCtrlForm();
public void HasDialogExample()
{
   // reference the convert control
   ConvertCtrl convertctrl = _form.ConvertCtrl;

   // input and output files
   string inFile = Path.Combine(LEAD_VARS.MediaDir,"ConvertCtrl_Source.avi");
   string outFile = Path.Combine(LEAD_VARS.MediaDir,"ConvertCtrl_HasDialogExample.wmv");

   try
   {
      // set the source for conversion
      convertctrl.SourceFile = inFile;

      // select the target format
      convertctrl.TargetFormat = TargetFormatType.WMV;

      // select video and audio target formats for the output
      int index = -1;
      TargetVideoFormats targetvideoformats = convertctrl.TargetFormats[convertctrl.TargetFormat].VideoFormats;
      index = targetvideoformats.IndexOf("{33564D57-0000-0010-8000-00AA00389B71}");// Windows Media Video 9 (WMV)
      targetvideoformats.Selection = index;
      TargetAudioFormats targetaudioformats = convertctrl.TargetFormats[convertctrl.TargetFormat].AudioFormats;
      index = targetaudioformats.IndexOf("{00000161-0000-0010-8000-00AA00389B71}");// Windows Media Audio (WMA)
      targetaudioformats.Selection = index;

      // set the target output file and format
      convertctrl.TargetFile = outFile;

      // The HasDialog method tells us that the control
      // can display the desired settings dialog.
      // check to see if the convert source dialog is available
      if (convertctrl.HasDialog(ConvertDlg.TargetFormat))
      {
         // now show it
         convertctrl.ShowDialog(ConvertDlg.TargetFormat, _form);
         _result = true;
      }

      // start the capture process
      convertctrl.StartConvert();

      // 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 (convertctrl.State == ConvertState.Running)
         Application.DoEvents();

      // see if there was an error
      if (convertctrl.ConvertError != 0)
      {
         // set the result to false
         _result = false;
      }
   }
   catch (Exception)
   {
      _result = false;
   }
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media";
}

Target Platforms

Reference

ConvertCtrl Class
ConvertCtrl Members