QueryCapability Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
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
)

 function Leadtools.Twain.TwainSession.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.

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

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

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: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

TwainSession Class
TwainSession Members
QuerySupportedCapabilities Method
GetCapability Method
SetCapability Method