public class KeyPressEventArgs : EventArgs
public ref class KeyPressEventArgs : public System.EventArgs
The KeyPressEvent event occurs when a key is pressed and a multimedia control has focus. This class is the event argument passed to the related event handler.
using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;
public bool _result = false;
public bool _exit = false;
public CaptureCtrlForm _form = new CaptureCtrlForm(false);
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["USB"] == null)
throw new Exception("No USB capture device available");
capturectrl.VideoDevices["USB"].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;
case ' ':
// pause the capture or run if paused, this shows in the output file
if (_form.CaptureCtrl.State == CaptureState.Running || _form.CaptureCtrl.State == CaptureState.Pending)
_form.CaptureCtrl.PauseCapture();
else if (_form.CaptureCtrl.State == CaptureState.Paused)
_form.CaptureCtrl.RunCapture();
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:\LEADTOOLS23\Media";
}
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