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PreviewVisible Property

Summary

Gets or sets the preview visible state.

Syntax

C++/CLI

public virtual bool PreviewVisible { get; set; }

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 bool _exit = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
public ConvertCtrl _convertctrl; 
 
public void KeyPressesExample() 
{ 
   // reference the convert control 
   _convertctrl = _form.ConvertCtrl; 
   _convertctrl.Focus(); 
   // input and output files 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi"); 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_KeyPressesExample.mp4"); 
 
   try 
   { 
      // set the source file 
      _convertctrl.SourceFile = inFile; 
 
      // select MP4 target format 
      _convertctrl.TargetFormat = TargetFormatType.MP4; 
 
      // select H264 video target format 
      int index = -1; 
      TargetVideoFormats targetvideoformats = _convertctrl.TargetFormats[_convertctrl.TargetFormat].VideoFormats; 
      index = targetvideoformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}");// H264 
      targetvideoformats.Selection = index; 
 
      // select AAC audio target format 
      TargetAudioFormats targetaudioformats = _convertctrl.TargetFormats[_convertctrl.TargetFormat].AudioFormats; 
      index = targetaudioformats.IndexOf("{00001610-0000-0010-8000-00AA00389B71}");// AAC 
      targetaudioformats.Selection = index; 
 
      // enable preview 
      _convertctrl.PreviewVisible = true; 
      _convertctrl.Preview = true; 
 
      // set the target output file 
      _convertctrl.TargetFile = outFile; 
 
      // subscribe to the key events 
      _convertctrl.KeyPress += KeyPress_Helper; 
 
      // convert it now! 
      _convertctrl.StartConvert(); 
   } 
   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 (_convertctrl.State == ConvertState.Running || _convertctrl.State == ConvertState.Paused) 
      Application.DoEvents(); 
 
   // clean up event handlers 
   _convertctrl.KeyPress -= KeyPress_Helper; 
} 
 
void KeyPress_Helper(object sender, Leadtools.MediaFoundation.KeyPressEventArgs e) 
{ 
   switch ((char)e.keyAscii) 
   { 
      case 'p': 
         // toggle pausing 
         if(_convertctrl.State == ConvertState.Running) 
            _convertctrl.PauseConvert(); 
         else if(_convertctrl.State == ConvertState.Paused) 
            _convertctrl.RunConvert(); 
         break; 
      case 'f': 
         // toggle full screen mode 
         _convertctrl.ToggleFullScreenMode(); 
         break; 
      case 's': 
         // stop the conversion 
         _convertctrl.StopConvert(); 
         break; 
   } 
 
   // set result 
   _result = true; 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\LEADTOOLS23\Media"; 
}

Requirements

Target Platforms

Reference

ConvertCtrl Class

ConvertCtrl Members

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Help Version 23.0.2024.2.29

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies