IsAvailable Method

Determines whether a TWAIN source is installed.

Syntax

C#
Visual Basic
Objective-C
Java
C++

public static bool IsAvailable( 
   IWin32Window owner
)

'Declaration
 
Public Shared Function IsAvailable( _
   ByVal owner As IWin32Window _
) As Boolean

'Usage
 
Dim owner As IWin32Window
Dim value As Boolean
 
value = TwainSession.IsAvailable(owner)

public:
static bool IsAvailable( 
   IWin32Window^ owner
)

Parameters

owner: Window handle of the application window.

Return Value

true if at least one TWAIN source is installed, false if no TWAIN source is installed.

Remarks

You can use this method to enable or disable the TWAIN menu items for example.

Example

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

Copy Code

Imports Leadtools
Imports Leadtools.Twain

Public Sub IsAvailableExample(ByVal parent As IWin32Window)
   Dim twainAvailable As Boolean = TwainSession.IsAvailable(parent)
   If twainAvailable Then
      MessageBox.Show("Twain is installed")
   Else
      MessageBox.Show("Twain is not installed")
   End If
End Sub

using Leadtools;
using Leadtools.Twain;

public void IsAvailableExample(IWin32Window parent)
{
   bool twainAvailable = TwainSession.IsAvailable(parent);
   if (twainAvailable)
      MessageBox.Show("Twain is installed");
   else
      MessageBox.Show("Twain is not installed");
}

Requirements

Target Platforms

Reference

TwainSession Class
TwainSession Members
Startup Method
Shutdown Method
SelectSource Method
Acquire Method