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IsAvailable Method

Summary

Determines which version of the WIA source is installed.

Syntax

C++

public static bool IsAvailable(  
   Leadtools.Wia.WiaVersion version 
)

Public Shared Function IsAvailable( _ 
   ByVal version As Leadtools.Wia.WiaVersion _ 
) As Boolean

public: 
static bool IsAvailable(  
   Leadtools.Wia.WiaVersion version 
)

Parameters

version
The WIA version to be used. Possible values are:

Value	Meaning
WiaVersion.Version1	Use WIA version 1.0.
WiaVersion.Version2	Use WIA version 2.0.

Return Value

true if at least one WIA source of the specified version is installed, false if no WIA source is installed that supports the specified WIA version.

Remarks

Use this method to enable or disable WIA menu items.

Example

                                                                                                    
id="CSharpExampleTab" onclick="$.selectCodeContainer(this)">C#
 id="VBExampleTab" onclick="$.selectCodeContainer(this)">VB

 codeContainer VBExample hide">Imports Leadtools  Imports Leadtools.Codecs  Imports Leadtools.Wia   <TestMethod()> _  style="color:Blue;">#If Not LEADTOOLS_V19_OR_LATER Then  Public Sub IsAvailableExample(ByVal parent As IWin32Window)  style="color:Blue;">#Else  Public Sub IsAvailableExample(ByVal parent As IntPtr)  style="color:Blue;">#End If ' #If LEADTOOLS_V19_OR_LATER Then  If (Not WiaSession.IsAvailable(WiaVersion.Version1)) Then  MessageBox.Show("WIA version 1.0 not installed.")  Return  End If  Dim session As WiaSession = New WiaSession()  session.Startup(WiaVersion.Version1)   Dim res As DialogResult = session.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault)  If res <> DialogResult.OK Then  MessageBox.Show("Error selecting WIA device.")  session.Shutdown()  Return  End If   ' Initialize and fill the required fields from the WiaAcquireOptions structure  Dim wiaAcquireOptions As WiaAcquireOptions = wiaAcquireOptions.Empty  wiaAcquireOptions.MemoryBufferSize = 32 * 1024  wiaAcquireOptions.DoubleBuffer = True  session.AcquireOptions = wiaAcquireOptions   AddHandler session.AcquireEvent, AddressOf session_AcquireEvent   session.Acquire(parent, Nothing, WiaAcquireFlags.ShowUserInterface Or WiaAcquireFlags.UseCommonUI)   RemoveHandler session.AcquireEvent, AddressOf session_AcquireEvent  session.Shutdown()  End Sub   Public Sub session_AcquireEvent(ByVal sender As Object, ByVal e As WiaAcquireEventArgs)  Application.DoEvents()   If (e.Flags And WiaAcquiredPageFlags.StartOfPage) = WiaAcquiredPageFlags.StartOfPage Then  Console.WriteLine("Beginning of data transfer.")  ElseIf (e.Flags And WiaAcquiredPageFlags.EndOfPage) = WiaAcquiredPageFlags.EndOfPage Then  Console.WriteLine("End of data transfer.")  End If   If Not e.Image Is Nothing Then  ' You can load the image here.  End If   e.Cancel = False  End Sub

codeContainer CSharpExample hide">

using Leadtools;  using Leadtools.Codecs;  using Leadtools.Wia;   [TestMethod]  style="color:Blue;">#if !LEADTOOLS_V19_OR_LATER  public void IsAvailableExample(IWin32Window parent)  style="color:Blue;">#else  public void IsAvailableExample(IntPtr parent)  style="color:Blue;">#endif // #if !LEADTOOLS_V19_OR_LATER  {  if ( !WiaSession.IsAvailable(WiaVersion.Version1) )  {  MessageBox.Show("WIA version 1.0 not installed.");  return;  }  WiaSession wiaSession = new WiaSession();  wiaSession.Startup(WiaVersion.Version1);   DialogResult res = wiaSession.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault);  if(res != DialogResult.OK)  {  MessageBox.Show("Error selecting WIA device.");  wiaSession.Shutdown();  return;  }   // Initialize and fill the required fields from the WiaAcquireOptions structure  WiaAcquireOptions wiaAcquireOptions = WiaAcquireOptions.Empty;  wiaAcquireOptions.MemoryBufferSize = 32 * 1024;  wiaAcquireOptions.DoubleBuffer = true;  wiaSession.AcquireOptions = wiaAcquireOptions;   wiaSession.AcquireEvent += new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireEvent);   wiaSession.Acquire(parent, null, WiaAcquireFlags.ShowUserInterface |   WiaAcquireFlags.UseCommonUI);   wiaSession.AcquireEvent -= new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireEvent);  wiaSession.Shutdown();  }   public void wiaSession_AcquireEvent(object sender, WiaAcquireEventArgs e)  {  Application.DoEvents();   if ((e.Flags & WiaAcquiredPageFlags.StartOfPage) == WiaAcquiredPageFlags.StartOfPage)  Console.WriteLine("Beginning of data transfer.");  else if ((e.Flags & WiaAcquiredPageFlags.EndOfPage) == WiaAcquiredPageFlags.EndOfPage)  Console.WriteLine("End of data transfer.");   if (e.Image != null)  {  // You can load the image here.  }   e.Cancel = false;  }