AllocTarget Method

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Sub AllocTarget( _
   ByVal size As Integer _
)

'Usage
 
Dim instance As CaptureCtrl
Dim size As Integer
 
instance.AllocTarget(size)

public virtual void AllocTarget( 
   int size
)

public:
virtual void AllocTarget( 
   int size
)

Parameters

size: Value containing the size of the target to be allocated, in megabytes.

Pre-allocates the capture target to the specified size. This method is typically used when the target is defined as a file. For best capture results, always capture to a defragmented, pre-allocated capture file that is larger than the size of the capture data.

If the method fails, an error is raised. For more information, refer to the Error Codes.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public Sub AllocTargetExample()
   ' reference the capture control
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

   ' output file names
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_AllocTargetExample.avi")

   Try
      ' 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 MPEG2 as the video compressor
      capturectrl.VideoCompressors.Mpeg2.Selected = True

      ' set AC3 as the audio compressor
      capturectrl.AudioCompressors.AC3.Selected = True

      ' set the target output file
      capturectrl.TargetFile = outFile

      ' preallocate file to 10 MB
      capturectrl.AllocTarget(10)

      ' set the result
      _result = File.Exists(outFile)

   Catch e1 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.
   Do While capturectrl.State = CaptureState.Running
      Application.DoEvents()
   Loop
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media"
End Class

using Leadtools;
using Leadtools.Multimedia;
using LeadtoolsMultimediaExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
string outFile = Path.Combine(LEAD_VARS.MediaDir,"CaptureCtrl_AllocTargetExample.avi");
public void AllocTargetExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
      // set the target output file
      capturectrl.TargetFile = outFile;

      // allocate a file
      capturectrl.AllocTarget(1000) ;

      _result = File.Exists(outFile);               
   }
   catch (COMException)
   {
      _result = false;
   }
   catch (Exception)
   {
      _result = false;
   }
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media";
}

Target Platforms

Reference

CaptureCtrl Class
CaptureCtrl Members