GetStillDIB Method (CaptureCtrl)

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Function GetStillDIB( _
   ByVal timeOut As Integer _
) As IntPtr

'Usage
 
Dim instance As CaptureCtrl
Dim timeOut As Integer
Dim value As IntPtr
 
value = instance.GetStillDIB(timeOut)

public virtual IntPtr GetStillDIB( 
   int timeOut
)

public:
virtual IntPtr GetStillDIB( 
   int timeOut
)

Parameters

timeOut: A value containing the maximum time to wait for the image, in milliseconds.

Return Value

System.IntPtr

If the method succeeds, the caller must free the returned HDIB by calling the GlobalFree method. If TimeOut is -1, the method's time-out interval never elapses.

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

Note: The frame data is retrieved from the underlying graph after the processing filters. If the capture needs to occur before processing is completed, use the LeadVideoCallBackFilter and place it first in the collection of processing filters.

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

Copy Code

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public _capturectrl As CaptureCtrl = Nothing
Public _result As Boolean = False
Private _dibFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_GetStillDIBExample.dib")

Public Sub GetStillDIBExample()
   ' reference the capture control
   _capturectrl = _form.CaptureCtrl

   Try
      ' select a video capture device
      If _capturectrl.VideoDevices("USB") Is Nothing Then
         Throw New Exception("No USB video device available")
      End If

      _capturectrl.VideoDevices("USB").Selected = True

      ' set a video compressor for the capture file
      _capturectrl.VideoCompressors.Mpeg4.Selected = True

      ' start the capture
      _capturectrl.StartCapture(CaptureMode.Still)

      ' get the still DIB
      Dim DIB As IntPtr = _capturectrl.GetStillDIB(-1)

      ' stop the capture
      _capturectrl.StopCapture()

      ' check for the captured DIB handle
      If (DIB <> Nothing) Then
         _result = True
      End If

      ' free allocated global memory
      Marshal.FreeHGlobal(DIB)

   Catch e1 As Exception
      _result = False
   End Try
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();
public void GetStillDIBExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
       // set the video capture device. use your device's name here
      if (capturectrl.VideoDevices["Logitech"] == null)
         throw new Exception("No Logitech video device available");

      capturectrl.VideoDevices["Logitech"].Selected = true;

      // set the capture mode to still and start
      capturectrl.StartCapture(CaptureMode.Still);

      // capture device independent bitmap
      IntPtr dib = capturectrl.GetStillDIB(-1);

      // stop the capture
      capturectrl.StopCapture();

      _result = (dib != null);

      //free allocated global memory
      Marshal.FreeHGlobal(dib);
   }
   catch (COMException)
   {
      _result = false;
   }
   catch (Exception)
   {
      _result = false;
   }
}

Target Platforms

Reference

CaptureCtrl Class
CaptureCtrl Members