public virtual void TogglePreview()
Public Overridable Sub TogglePreview()
public:
virtual void TogglePreview();
This is a convenient method to turn the preview mode on and off. If the method fails an error is raised. For more information, refer to the Error Codes.
using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;
public bool _result = false;
public bool _exit = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void KeyPressesExample()
{
CaptureCtrl capturectrl = _form.CaptureCtrl;
string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_KeyPressesExample.avi");
try
{
// set a video device, use the name of your device here
if (capturectrl.VideoDevices["Analog"] == null)
throw new Exception("No Analog capture device available");
capturectrl.VideoDevices["Analog"].Selected = true;
// set an audio device, use the name of your device here
capturectrl.AudioDevices["USB"].Selected = true;
// enable preview
capturectrl.Preview = true;
// set the target output file
capturectrl.TargetFile = outFile;
// subscribe to the key events
capturectrl.KeyDown += KeyDown_Helper;
capturectrl.KeyUp += KeyUp_Helper;
capturectrl.KeyPress += KeyPress_Helper;
// capture it now!
capturectrl.StartCapture(CaptureMode.AutoFramesAndAudio);
}
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 (_exit == false)
Application.DoEvents();
// clean up event handlers
capturectrl.KeyDown -= KeyDown_Helper;
capturectrl.KeyUp -= KeyUp_Helper;
capturectrl.KeyPress -= KeyPress_Helper;
}
void KeyPress_Helper(object sender, Leadtools.MediaFoundation.KeyPressEventArgs e)
{
switch ((char)e.keyAscii)
{
case 'p':
// toggle preview mode
_form.CaptureCtrl.TogglePreview();
break;
case 'f':
// toggle full screen mode
_form.CaptureCtrl.ToggleFullScreenMode();
break;
case 's':
// stop the capture and exit
_form.CaptureCtrl.StopCapture();
_exit = true;
break;
}
// set result
_result = true;
}
void KeyUp_Helper(object sender, KeyUpEventArgs e)
{
// set result
_result = true;
}
public void KeyDown_Helper(object sender, KeyDownEventArgs e)
{
// set result
_result = true;
}
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 _exit As Boolean = False
Public _form As New CaptureCtrlForm()
Public Sub KeyPressesExample()
Dim capturectrl As CaptureCtrl = _form.CaptureCtrl
Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_KeyPressesExample.avi")
Try
' set a video device, use the name of your device here
If capturectrl.VideoDevices("Analog") Is Nothing Then
Throw New Exception("No Analog capture device available")
End If
capturectrl.VideoDevices("Analog").Selected = True
' set an audio device, use the name of your device here
capturectrl.AudioDevices("USB").Selected = True
' enable preview
capturectrl.Preview = True
' set the target output file
capturectrl.TargetFile = outFile
' subscribe to the key events
AddHandler capturectrl.KeyDown, AddressOf KeyDown_Helper
AddHandler capturectrl.KeyUp, AddressOf KeyUp_Helper
AddHandler capturectrl.KeyPress, AddressOf KeyPress_Helper
' capture it now!
capturectrl.StartCapture(CaptureMode.AutoFramesAndAudio)
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 _exit = False
Application.DoEvents()
End While
' clean up event handlers
RemoveHandler capturectrl.KeyDown, AddressOf KeyDown_Helper
RemoveHandler capturectrl.KeyUp, AddressOf KeyUp_Helper
RemoveHandler capturectrl.KeyPress, AddressOf KeyPress_Helper
End Sub
Private Sub KeyPress_Helper(ByVal sender As Object, ByVal e As Leadtools.MediaFoundation.KeyPressEventArgs)
Select Case e.keyAscii
Case CShort("p")
' toggle preview mode
_form.CaptureCtrl.TogglePreview()
Case CShort("f")
' toggle full screen mode
_form.CaptureCtrl.ToggleFullScreenMode()
Case CShort("s")
' stop the capture and exit
_form.CaptureCtrl.StopCapture()
_exit = True
End Select
' set result
_result = True
End Sub
Private Sub KeyUp_Helper(ByVal sender As Object, ByVal e As KeyUpEventArgs)
' set result
_result = True
End Sub
Public Sub KeyDown_Helper(ByVal sender As Object, ByVal e As KeyDownEventArgs)
' set result
_result = True
End Sub
Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\LEADTOOLS21\Media"
End Class
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