Gets or sets the option to continue to display the preview during a call to the ShowDialog method.
public virtual bool ShowDialogPreview { get; set; }
Public Overridable Property ShowDialogPreview As Boolean
true if the preview will continue displaying during ShowDialog calls; otherwise, it is false.
using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;
public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
// capture control
CaptureCtrl capturectrl;
// output file
string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ShowDialogPreviewExample.avi");
public void ShowDialogPreviewExample()
{
// reference the capture control
capturectrl = _form.CaptureCtrl;
try
{
// set the source video device, select using your device name here
if (capturectrl.VideoDevices["USB"] == null)
{
throw new Exception("No USB video device available");
}
capturectrl.VideoDevices["USB"].Selected = true;
// set the target file and format
capturectrl.TargetFile = outFile;
capturectrl.TargetFormat = TargetFormatType.MP4;
capturectrl.FrameRate = 5;
// 5 frames per second
capturectrl.UseFrameRate = true;
capturectrl.TimeLimit = 10;
// just 10 seconds of capture time
capturectrl.UseTimeLimit = true;
if (capturectrl.IsModeAvailable(CaptureMode.Video))
{
// set show dialog preview, the preview mode will be enabled when ShowDialog is invoked
capturectrl.ShowDialogPreview = true;
// enable the preview
capturectrl.Preview = true;
// subscribe to the started event
capturectrl.Started += CaptureCtrl_Started;
// check the video capture dialog properties if available
if (capturectrl.HasDialog(CaptureDlg.TargetFormat))
{
capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form);
}
// start capture
capturectrl.StartCapture(CaptureMode.Video);
// get the show dialog preview
bool ShowDialogPreview = capturectrl.ShowDialogPreview;
// set the result to what we expect
_result = (ShowDialogPreview && capturectrl.Preview);
}
}
catch (COMException)
{
_result = false;
}
catch (Exception)
{
_result = false;
}
}
void CaptureCtrl_Started(object sender, EventArgs e)
{
// stop the capture (we don't need a complete capture for this example)
capturectrl.StopCapture();
}
static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media";
}
Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures
Public _result As Boolean = False
Public _form As New CaptureCtrlForm()
' capture control
Private capturectrl As CaptureCtrl
' output file
Private outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ShowDialogPreviewExample.avi")
Public Sub ShowDialogPreviewExample()
' reference the capture control
capturectrl = _form.CaptureCtrl
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 the target file and format
capturectrl.TargetFile = outFile
capturectrl.TargetFormat = TargetFormatType.MP4
capturectrl.FrameRate = 5
' 5 frames per second
capturectrl.UseFrameRate = True
capturectrl.TimeLimit = 10
' just 10 seconds of capture time
capturectrl.UseTimeLimit = True
If capturectrl.IsModeAvailable(CaptureMode.Video) Then
' set show dialog preview, the preview mode will be enabled when ShowDialog is invoked
capturectrl.ShowDialogPreview = True
' enable the preview
capturectrl.Preview = True
' subscribe to the started event
AddHandler capturectrl.Started, AddressOf CaptureCtrl_Started
' check the video capture dialog properties if available
If capturectrl.HasDialog(CaptureDlg.TargetFormat) Then
capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form)
End If
' start capture
capturectrl.StartCapture(CaptureMode.Video)
' get the show dialog preview
Dim ShowDialogPreview As Boolean = capturectrl.ShowDialogPreview
' set the result to what we expect
_result = (ShowDialogPreview AndAlso capturectrl.Preview)
End If
Catch generatedExceptionName As COMException
_result = False
Catch generatedExceptionName As Exception
_result = False
End Try
End Sub
Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs)
' stop the capture (we don't need a complete capture for this example)
capturectrl.StopCapture()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media"
End Class
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