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; false, otherwise.
using Leadtools;
using Leadtools.Multimedia;
using LeadtoolsMultimediaExamples.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. use your device's name here
if (capturectrl.VideoDevices["USB"] == null)
{
throw new Exception("No USB video device available");
}
capturectrl.VideoDevices["USB"].Selected = true;
// select video and audio compressors
capturectrl.VideoCompressors.Mpeg2.Selected = true;
// set the target file and format
capturectrl.TargetFile = outFile;
capturectrl.TargetFormat = TargetFormatType.AVI;
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 do not 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.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures
Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public _capturectrl As CaptureCtrl = _form.CaptureCtrl
Public Sub ShowDialogPreviewExample()
' reference the capture control
_capturectrl = _form.CaptureCtrl
' output file names
Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ShowDialogPreviewExample.avi")
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
' select video and audio compressors
_capturectrl.VideoCompressors.Mpeg2.Selected = True
' set the target file and format
_capturectrl.TargetFile = outFile
_capturectrl.TargetFormat = TargetFormatType.AVI
_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 e1 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.
Do While _capturectrl.State = CaptureState.Running
Application.DoEvents()
Loop
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
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document
Your email has been sent to support! Someone should be in touch! If your matter is urgent please come back into chat.
Chat Hours:
Monday - Friday, 8:30am to 6pm ET
Thank you for your feedback!
Please fill out the form again to start a new chat.
All agents are currently offline.
Chat Hours:
Monday - Friday
8:30AM - 6PM EST
To contact us please fill out this form and we will contact you via email.