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TargetObject Property

Summary

Gets or sets the media target object.

Syntax

C++/CLI

public virtual object TargetObject { get; set; }

public: 
virtual property Object^ TargetObject { 
   Object^ get(); 
   void set (    Object^ ); 
}

Property Value

An object representing a COM target interface.

Remarks

This property allows the user to assign a COM object as the media target for the capturing process. The object may be the SampleTarget object or any other DirectShow renderer filter. The ResetTarget method should be called to stop the capture control from accessing the object. The TargetType will be set to TargetObjectType.Object. Assignment can raise an error exception. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public CaptureAndPlayCtrlForm _form = new CaptureAndPlayCtrlForm(); 
public SampleTarget _captureTarget; 
public SampleSource _playSource; 
 
public void GetPortableTypeExample() 
{ 
   // reference the convert control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
   PlayCtrl playctrl = _form.PlayCtrl; 
 
   // This example demonstrates how to play a capture stream  
   // using a play control and portable media types. 
 
   try 
   { 
      // set the source device 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video devices available!"); 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
      // set the preview 
      capturectrl.Preview = true; 
 
      // create a sample target object for the capture control 
      _captureTarget = new SampleTarget(); 
 
      // set the capture target to our sample target created earlier 
      capturectrl.TargetObject = _captureTarget; 
 
      // create a new sample source object for the play control 
      _playSource = new SampleSource(); 
 
      // set the video compressor  
      capturectrl.VideoCompressors.MCmpMJpeg.Selected = true; 
 
      //// for this example we will only capture 120 seconds of video 
      capturectrl.UseTimeLimit = true; 
      capturectrl.TimeLimit = 120; 
 
      // start the capture 
      capturectrl.StartCapture(CaptureMode.Video); 
 
      // we could just assign the media type from target to source 
      // however, let's use the portable type to simulate 
      // the needed steps for remote playback 
      Byte[] portableMediaType = _captureTarget.GetConnectedMediaType().GetPortableType(); 
 
      // initialize a new media type object with the portable type 
      MediaType mt = new MediaType(); 
      mt.SetPortableType(portableMediaType); 
 
      // set the sample source media type 
      _playSource.SetMediaType(mt); 
 
      // set the play controls sample source object 
      playctrl.SourceObject = _playSource; 
 
      // create a timer to drive the sample delivery 
      _form.TestTimer.Tick += new EventHandler(SampleDeliver_Tick); 
      _form.TestTimer.Interval = 33; 
      _form.TestTimer.Start(); 
 
      // 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 (capturectrl.State == CaptureState.Running 
         || capturectrl.State == CaptureState.Paused 
         || capturectrl.State == CaptureState.Pending) 
         Application.DoEvents(); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void SampleDeliver_Tick(object sender, EventArgs e) 
{ 
   _form.TestTimer.Stop(); 
 
   bool eos = false; 
   MediaSample cs = null; 
 
   try 
   { 
      cs = _captureTarget.GetSample(1000); 
   } 
   catch (COMException cex) 
   { 
      if (cex.ErrorCode == (int)ErrorCode.VFW_E_SAMPLE_REJECTED_EOS) 
         eos = true; 
      else 
         throw; 
   } 
   catch (Exception ex) 
   { 
      throw new Exception(ex.Message); 
   } 
 
   if (!eos) 
   { 
      _playSource.DeliverSample(1000, cs); 
      _form.TestTimer.Start(); 
   } 
   else 
   { 
      _playSource.DeliverEndOfStream(1000); 
      _form.TestTimer.Stop(); 
 
      // set the result 
      _result = true; 
   } 
}

Requirements

Target Platforms

Reference

CaptureCtrl Class

CaptureCtrl Members

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Help Version 23.0.2024.2.29

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies