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QueryCapability Method

Summary

Gets all of the supported values for the requested capability.

Syntax

C++

public TwainCapability QueryCapability( 
   TwainCapabilityType type 
)

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

public: 
TwainCapability^ QueryCapability(  
   TwainCapabilityType type 
)

Parameters

type
Indicates the capability to get.

Return Value

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

Remarks

For more information, refer to Freeing the TWAIN Session.

Example

using Leadtools; 
using Leadtools.Twain; 
 
public void QueryCapabilityExample(IntPtr 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); 
   } 
}

Imports Leadtools 
Imports Leadtools.Twain 
 
 
Public Sub QueryCapabilityExample(ByVal parent As IntPtr) 
   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

Requirements

Target Platforms

Reference

TwainSession Class

TwainSession Members

QuerySupportedCapabilities Method

GetCapability Method

SetCapability Method

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Help Version 20.0.2020.3.31

Leadtools.Twain Assembly

Introduction

Getting Started

Namespaces

Leadtools.Twain Namespace

Assemblies