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Selection Property

Summary

Gets an index of the currently selected CaptureSize item.

Syntax

C++

public int Selection { get; set; }

Public Property Selection As Integer

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

Property Value

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

Remarks

Assignment can raise an error exception. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void CaptureSizesExample() 
{ 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   try 
   { 
      // select a USB video device, use your device name here 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video device available"); 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
      // reference the capture size collection 
      CaptureSizes sizes = capturectrl.VideoCaptureSizes; 
 
      // get the current selection 
      int n = sizes.Selection; 
 
      // loop through all the capture sizes 
      foreach (CaptureSize cs in sizes) 
      { 
         // check some criteria and select one 
         if (cs.Width == 640 && cs.Height == 480) 
         { 
            // select it and break 
            cs.Selected = true; 
            break; 
         } 
      } 
 
      // set the result to what we expect 
      _result = (n != sizes.Selection); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
}

Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
 
Public Sub CaptureSizesExample() 
   ' reference the capture control 
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
   Try 
      ' select a USB video device, use 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 
 
      ' reference the capture size collection 
      Dim sizes As CaptureSizes = capturectrl.VideoCaptureSizes 
 
      ' get the current selection 
      Dim n As Integer = sizes.Selection 
 
      ' loop through all the capture sizes 
      For Each cs As CaptureSize In sizes 
         ' check some criteria and select one 
         If cs.Width = 640 AndAlso cs.Height = 480 Then 
            ' select it and break 
            cs.Selected = True 
            Exit For 
         End If 
      Next cs 
 
      ' set the result to what we expect 
      _result = (n <> sizes.Selection) 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub

Requirements

Target Platforms

Reference

CaptureSizes Class

CaptureSizes Members

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Help Version 21.0.2021.7.2

Leadtools.MediaFoundation Assembly

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Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

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