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Preview Property

Summary

Gets or sets the Convert control's preview state.

Syntax

C++/CLI

public virtual bool Preview { get; set; }

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

Property Value

true if Preview is enabled: otherwise it is false.

Remarks

The default value is false. 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