QueryCapability Method

C#
Visual Basic
Objective-C
Java
C++

public TwainCapability QueryCapability( 
   TwainCapabilityType type
)

'Declaration
 
Public Function QueryCapability( _
   ByVal type As TwainCapabilityType _
) As TwainCapability

'Usage
 
Dim instance As TwainSession
Dim type As TwainCapabilityType
Dim value As TwainCapability
 
value = instance.QueryCapability(type)

public:
TwainCapability^ QueryCapability( 
   TwainCapabilityType type
)

Parameters

type: Indicates the capability to get.

Return Value

A TwainCapability object represents all the supported values of the requested capability.

For more information, refer to Freeing the TWAIN Session.

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

Copy Code

Imports Leadtools
Imports Leadtools.Twain

Public Sub QueryCapabilityExample(ByVal parent As IWin32Window)
   Try
      Dim twnSession As TwainSession = New TwainSession()
      twnSession.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)

      Dim twCap As TwainCapability = twnSession.QueryCapability(TwainCapabilityType.ImageUnits)

      If twCap.Information.ContainerType = TwainContainerType.OneValue Then
         If CType(twCap.OneValueCapability.Value, TwainCapabilityValue) <> TwainCapabilityValue.UnitInches Then
            twCap.OneValueCapability.Value = TwainCapabilityValue.UnitInches
            twnSession.SetCapability(twCap, TwainSetCapabilityMode.Set)
         End If
      End If
      twnSession.Shutdown()
   Catch ex As Exception
      MessageBox.Show(ex.Message)
   End Try
End Sub

using Leadtools;
using Leadtools.Twain;

public void QueryCapabilityExample(IWin32Window parent)
{
   try
   {
      TwainSession twnSession = new TwainSession();
      twnSession.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);

      TwainCapability twCap = twnSession.QueryCapability(TwainCapabilityType.ImageUnits);

      if (twCap.Information.ContainerType == TwainContainerType.OneValue)
      {
         if (twCap.OneValueCapability.Value != (object)TwainCapabilityValue.UnitInches)
         {
            twCap.OneValueCapability.Value = TwainCapabilityValue.UnitInches;
            twnSession.SetCapability(twCap, TwainSetCapabilityMode.Set);
         }
      }
      twnSession.Shutdown();
   }
   catch (Exception ex)
   {
      MessageBox.Show(ex.Message);
   }
}

Target Platforms

Reference

TwainSession Class
TwainSession Members
QuerySupportedCapabilities Method
GetCapability Method
SetCapability Method