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PreviewVisible Property

Summary

Gets or sets the preview visible state.

Syntax

C++

public virtual bool PreviewVisible { get; set; }

Public Overridable Property PreviewVisible As Boolean

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

Property Value

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

Remarks

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.

Example

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 20\Media"; 
}

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 20\Media" 
End Class

Requirements

Target Platforms

Reference

ConvertCtrl Class

ConvertCtrl Members

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Help Version 20.0.2020.4.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies