CaptureDIB Method

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Function CaptureDIB() As IntPtr

'Usage
 
Dim instance As CaptureCtrl
Dim value As IntPtr
 
value = instance.CaptureDIB()

public virtual IntPtr CaptureDIB()

public:
virtual IntPtr CaptureDIB();

Return Value

A System.IntPtr to the device independent bitmap.

If the method succeeds, the caller must free the returned HDIB pointer by calling the Marshal.FreeHGlobal method. If the method fails, an error is raised. For more information, refer to the Error Codes.

Note: Internally this method calls StartCapture with the capture mode set to CaptureMode.Still. It then waits for the current capture delay setting specified by CaptureStillDelay before capturing the still DIB. Finally, it stops the session by calling StopCapture.

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

Copy Code

Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures

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

    Try
        ' set the video capture device, use your capture device name here
        If capturectrl.VideoDevices("Logitech") Is Nothing Then
            Throw New Exception("No Logitech video device available")
        End If

        capturectrl.VideoDevices("Logitech").Selected = True

        ' let's set a delay of 1 second to insure that some capture devices
        ' have time to adjust their gain
        capturectrl.CaptureStillDelay = 1000

        ' capture device independent bitmap
        Dim dib As IntPtr = capturectrl.CaptureDIB()

        _result = (dib <> Nothing)

        'free allocated global memory
        Marshal.FreeHGlobal(dib)
    Catch generatedExceptionName As COMException
        _result = False
    Catch generatedExceptionName As Exception
        _result = False
    End Try
End Sub

using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void CaptureDIBExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

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

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

      // let's set a delay of 1 second to insure that some capture devices
      // have time to adjust their gain
      capturectrl.CaptureStillDelay = 1000;

      // capture device independent bitmap
      IntPtr dib = capturectrl.CaptureDIB();

      _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