AllocTarget Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public virtual void AllocTarget( 
   int size
)

'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
)

 function Leadtools.Multimedia.CaptureCtrl.AllocTarget( 
   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

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 175\Media";
End Class

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 175\Media";
}

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

CaptureCtrl Class
CaptureCtrl Members