- 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.
Visual Basic (Declaration) | |
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Public Shared Function IsAvailable( _ ByVal version As WiaVersion _ ) As Boolean |
Visual Basic (Usage) | ![]() |
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Dim version As WiaVersion Dim value As Boolean value = WiaSession.IsAvailable(version) |
C# | |
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public static bool IsAvailable( WiaVersion version ) |
C++/CLI | |
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public: static bool IsAvailable( 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.Visual Basic | ![]() |
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Public Sub IsAvailableExample(ByVal parent As IWin32Window) 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 |
C# | ![]() |
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public void IsAvailableExample(IWin32Window parent) { 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; } |
Use this method to enable or disable WIA menu items.
Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7