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HasDialog Method
See Also 
Leadtools.Multimedia Namespace > CaptureCtrl Class : HasDialog Method



dialog
Value that specifies which dialog's availability is to be checked.
dialog
Value that specifies which dialog's availability is to be checked.
Checks whether the specified property dialog is available.

Syntax

Visual Basic (Declaration) 
Public Overridable Function HasDialog( _
   ByVal dialog As CaptureDlg _
) As Boolean
Visual Basic (Usage)Copy Code
Dim instance As CaptureCtrl
Dim dialog As CaptureDlg
Dim value As Boolean
 
value = instance.HasDialog(dialog)
C# 
public virtual bool HasDialog( 
   CaptureDlg dialog
)
C++/CLI 
public:
virtual bool HasDialog( 
   CaptureDlg dialog
) 

Parameters

dialog
Value that specifies which dialog's availability is to be checked.

Return Value

true if the specified property dialog is available; otherwise it is false.

Example

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

         ' output file for capture
         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_HasDialogExample.avi")

         Try
            ' try to find a USB camera
            If capturectrl.VideoDevices("USB") Is Nothing Then
               Throw New Exception("No USB video device available")
            End If

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

            ' try to find a USB audio device
            If capturectrl.AudioDevices("USB") Is Nothing Then
               Throw New Exception("No USB audio device available")
            End If

            capturectrl.AudioDevices("USB").Selected = True

            ' The HasDialog method tells us that the control
            ' can display the desired settings dialog.
            ' check to see if the Capture properties dialog is available
            If capturectrl.HasDialog(CaptureDlg.Capture) Then
               ' now show it to change some settings
               capturectrl.ShowDialog(CaptureDlg.Capture, _form)
               _result = True
            End If

            ' set MPEG2 as the video compressor
            capturectrl.VideoCompressors.Mpeg2.Selected = True

            ' set AC3 as the audio compressor
            capturectrl.AudioCompressors.AC3.Selected = True

            ' set the target output file and format
            capturectrl.TargetFile = outFile

            ' set the target output format
            capturectrl.TargetFormat = TargetFormatType.AVI

            ' check if we have can capture video and audio
            If capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio) Then
               capturectrl.FrameRate = 5 ' 5 frames per second
               capturectrl.UseFrameRate = True
               capturectrl.TimeLimit = 10 ' just 10 seconds of capture time
               capturectrl.UseTimeLimit = True

               ' start the capture process
               capturectrl.StartCapture(CaptureMode.VideoAndAudio)

               ' 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 If
         Catch e1 As Exception
            _result = False
         End Try
      End Sub

Public NotInheritable Class LEAD_VARS
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 17\Media"
End Class
C#Copy Code
public bool _result = false;
      public CaptureCtrlForm _form = new CaptureCtrlForm();
      public void HasDialogExample()
      {
         // reference the capture control
         CaptureCtrl capturectrl = _form.CaptureCtrl;

         // output file for capture
         string outFile = Path.Combine(LEAD_VARS.MediaDir,"CaptureCtrl_HasDialogExample.avi");

         try
         {
            // try to find a USB camera
            if (capturectrl.VideoDevices["USB"] == null)
               throw new Exception("No USB video device available");

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

            // try to find a USB audio device
            if (capturectrl.AudioDevices["USB"] == null)
               throw new Exception("No USB audio device available");

            capturectrl.AudioDevices["USB"].Selected = true;

            // The HasDialog method tells us that the control
            // can display the desired settings dialog.
            // check to see if the Capture properties dialog is available
            if (capturectrl.HasDialog(CaptureDlg.Capture))
            {
               // now show it to change some settings
               capturectrl.ShowDialog(CaptureDlg.Capture, _form);
               _result = true;
            }

            // set MPEG2 as the video compressor
            capturectrl.VideoCompressors.Mpeg2.Selected = true;

            // set AC3 as the audio compressor
            capturectrl.AudioCompressors.AC3.Selected = true;

            // set the target output file and format
            capturectrl.TargetFile = outFile;

            // set the target output format
            capturectrl.TargetFormat = TargetFormatType.AVI;

            // check if we have can capture video and audio
            if (capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio))
            {
               capturectrl.FrameRate = 5;       // 5 frames per second 
               capturectrl.UseFrameRate = true;
               capturectrl.TimeLimit = 10;      // just 10 seconds of capture time
               capturectrl.UseTimeLimit = true;

               // start the capture process
               capturectrl.StartCapture(CaptureMode.VideoAndAudio);

               // 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 (capturectrl.State == CaptureState.Running)
                  Application.DoEvents();
            }
         }
         catch (Exception)
         {
            _result = false;
         }
      }

static class LEAD_VARS
{
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 17\Media";
}

Remarks

The dialog value must be one of the CaptureDlg enumeration values.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7

See Also