Selection Property (VideoFormats)

Visual Basic
C#
C++/CLI

'Declaration
 
Public Property Selection As Integer

'Usage
 
Dim instance As VideoFormats
Dim value As Integer
 
instance.Selection = value
 
value = instance.Selection

public int Selection {get; set;}

public:
property int Selection {
   int get();
   void set (    int value);
}

Property Value

The zero-based index of the selected item; otherwise -1 if no item is selected.

Gets or sets the index of the selected VideoFormat item. Assigning a value to this property could raise an error exception. For more information, refer to the Error Codes.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures

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

   Dim count As Integer, compression As Integer = 0, bits As Integer = 0, width As Integer = 0, height As Integer = 0
   Dim found As Integer, selected As Integer = -1

   ' set a video device, use the name of your device here
   If Not capturectrl.VideoDevices("USB") Is Nothing Then
      capturectrl.VideoDevices("USB").Selected = True
   End If

   ' reference the videoformats property
   Dim videoformats As VideoFormats = capturectrl.VideoCaptureFormats

   Try
      ' get count of available video formats
      count = videoformats.Count

      ' enumerate formats and select one
      For Each vf As VideoFormat In videoformats
         ' get the properties
         bits = vf.BitCount
         compression = vf.Compression
         width = vf.Width
         height = vf.Height

         ' select the format if it matches some criteria
         If bits = 16 AndAlso width = 640 AndAlso height = 480 Then
            vf.Selected = True
            Exit For
         End If
      Next vf

      ' reset the current item
      videoformats.Reset()

      ' get the currently selected format
      selected = videoformats.Selection

      ' find a format based on subtype name, width and height (YUY2 320 x 240 video)
      found = videoformats.IndexOf(Leadtools.MediaFoundation.Constants.MEDIASUBTYPE_YUY2, 320, 240)

      ' our found format is not selected, so select it
      If found <> selected Then
         videoformats.Selection = found
      End If

      ' get the new selected format
      selected = videoformats.Selection

      ' set our result based on what we expect
      _result = (count > 0 AndAlso selected = found)
   Catch e1 As Exception
      _result = False
   End Try
End Sub

using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;

public CaptureCtrlForm _form = new CaptureCtrlForm();
public bool _result = false;
public void VideoFormatExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   int count, compression = 0, bits = 0, width = 0, height = 0;
   int found, selected = -1;

   // set a video device, use the name of your device here
   if (capturectrl.VideoDevices["USB"] != null)
      capturectrl.VideoDevices["USB"].Selected = true;

   // reference the videoformats property
   VideoFormats videoformats = capturectrl.VideoCaptureFormats;

   try
   {
      // get count of available video formats
      count = videoformats.Count;

      // enumerate formats and select one
      foreach (VideoFormat vf in videoformats)
      {
         // get the properties
         bits = vf.BitCount;
         compression = vf.Compression;
         width = vf.Width;
         height = vf.Height;

         // select the format if it matches some criteria
         if (bits == 16 && width == 640 && height == 480)
         {
            vf.Selected = true;
            break;
         }
      }

      // reset the current item
      videoformats.Reset();

      // get the currently selected format
      selected = videoformats.Selection;

      // find a format based on subtype name, width and height (YUY2 320 x 240 video)
      found = videoformats.IndexOf(Constants.MEDIASUBTYPE_YUY2, 320, 240);

      // our found format is not selected, so select it
      if (found != selected)
         videoformats.Selection = found;

      // get the new selected format
      selected = videoformats.Selection;

      // set our result based on what we expect
      _result = (count > 0 && selected == found);
   }
   catch (Exception)
   {
      _result = false;
   }
}

Target Platforms

Reference

VideoFormats Class
VideoFormats Members