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EnterEdit Method

Summary

Enters editing mode by preventing the capture object from rebuilding the media session while devices are being selected.

Syntax

C++

public virtual void EnterEdit()

Public Overridable Sub EnterEdit()

public: 
virtual void EnterEdit();

Remarks

EnterEdit and LeaveEdit help speed up application startup.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void EnterEditExample() 
{ 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   // output file names 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_EnterEditExample.mpg"); 
 
   try 
   { 
      // enter edit mode so that all graph changes will be  
      // made at one time (after the LeaveEdit call later) 
      capturectrl.EnterEdit(); 
 
      // set the source video device, select using your device name here 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video device available"); 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
 
      // set the target file 
      capturectrl.TargetFile = outFile; 
 
      capturectrl.FrameRate = 5;       // 5 frames per second  
      capturectrl.UseFrameRate = true; 
      capturectrl.TimeLimit = 10;      // just 10 seconds of capture time 
      capturectrl.UseTimeLimit = true; 
 
      // apply the graph changes now 
      capturectrl.LeaveEdit(); 
 
      // run the capture 
      capturectrl.StartCapture(CaptureMode.Video); 
 
      // set the result 
      _result = true; 
   } 
   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 (capturectrl.State == CaptureState.Running) 
      Application.DoEvents(); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\LEADTOOLS21\Media"; 
}

Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As New CaptureCtrlForm() 
 
Public Sub EnterEditExample() 
   ' reference the capture control 
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
   ' output file names 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_EnterEditExample.mpg") 
 
   Try 
      ' enter edit mode so that all graph changes will be  
      ' made at one time (after the LeaveEdit call later) 
      capturectrl.EnterEdit() 
 
      ' set the source video device, select using your device name here 
      If capturectrl.VideoDevices("USB") Is Nothing Then 
         Throw New Exception("No USB video device available") 
      End If 
 
      capturectrl.VideoDevices("USB").Selected = True 
 
 
      ' set the target file 
      capturectrl.TargetFile = outFile 
 
      capturectrl.FrameRate = 5 
      ' 5 frames per second  
      capturectrl.UseFrameRate = True 
      capturectrl.TimeLimit = 10 
      ' just 10 seconds of capture time 
      capturectrl.UseTimeLimit = True 
 
      ' apply the graph changes now 
      capturectrl.LeaveEdit() 
 
      ' run the capture 
      capturectrl.StartCapture(CaptureMode.Video) 
 
      ' set the result 
      _result = True 
   Catch generatedExceptionName As Exception 
      _result = False 
   End Try 
 
   ' 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 
      Application.DoEvents() 
   End While 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\LEADTOOLS21\Media" 
End Class

Requirements

Target Platforms

Reference

CaptureCtrl Class

CaptureCtrl Members

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Help Version 21.0.2021.7.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies