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GetPropertySystemTime Method
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Leadtools.Wia Namespace > WiaSession Class : GetPropertySystemTime Method



item
Handle to the item which represents the item having the property. You can retrieve this parameter by either calling the WiaSession.GetRootItem method to get the device’s root item itself or by enumerating the child items of the device through a call to EnumChildItems method.
propertyIdName

This string should contain the equivalent property Id string for the WIA property ID. Use the see GetPropertyIdString method to get this string for the property ID.

If you passed null for this parameter then the WIA toolkit will use the property ID passed through the third parameter propertyId; otherwise this parameters will be used whether or not you passed valid property ID through the propertyId parameter

propertyId

The property ID for the value being sought, for list of available property IDs see WiaPropertyId.

This parameter is required only if the second parameter "propertyIdName"is null; otherwise you can pass 0 for this parameter.

item
Handle to the item which represents the item having the property. You can retrieve this parameter by either calling the WiaSession.GetRootItem method to get the device’s root item itself or by enumerating the child items of the device through a call to EnumChildItems method.
propertyIdName

This string should contain the equivalent property Id string for the WIA property ID. Use the see GetPropertyIdString method to get this string for the property ID.

If you passed null for this parameter then the WIA toolkit will use the property ID passed through the third parameter propertyId; otherwise this parameters will be used whether or not you passed valid property ID through the propertyId parameter

propertyId

The property ID for the value being sought, for list of available property IDs see WiaPropertyId.

This parameter is required only if the second parameter "propertyIdName"is null; otherwise you can pass 0 for this parameter.

Retrieves a DateTime structure for any WIA property of type WiaVariableTypes.UI2 or WiaVariableTypes.Vector.

Syntax

Visual Basic (Declaration) 
Public Sub GetPropertySystemTime( _
   ByVal item As Object, _
   ByVal propertyIdName As String, _
   ByVal propertyId As WiaPropertyId _
)
Visual Basic (Usage)Copy Code
Dim instance As WiaSession
Dim item As Object
Dim propertyIdName As String
Dim propertyId As WiaPropertyId
 
instance.GetPropertySystemTime(item, propertyIdName, propertyId)
C# 
public void GetPropertySystemTime( 
   object item,
   string propertyIdName,
   WiaPropertyId propertyId
)
C++/CLI 
public:
void GetPropertySystemTime( 
   Object^ item,
   String^ propertyIdName,
   WiaPropertyId propertyId
)

Parameters

item
Handle to the item which represents the item having the property. You can retrieve this parameter by either calling the WiaSession.GetRootItem method to get the device’s root item itself or by enumerating the child items of the device through a call to EnumChildItems method.
propertyIdName

This string should contain the equivalent property Id string for the WIA property ID. Use the see GetPropertyIdString method to get this string for the property ID.

If you passed null for this parameter then the WIA toolkit will use the property ID passed through the third parameter propertyId; otherwise this parameters will be used whether or not you passed valid property ID through the propertyId parameter

propertyId

The property ID for the value being sought, for list of available property IDs see WiaPropertyId.

This parameter is required only if the second parameter "propertyIdName"is null; otherwise you can pass 0 for this parameter.

Example

Visual BasicCopy Code
Dim wia_Session As WiaSession
Public Sub GetPropertySystemTimeExample(ByVal parent As IWin32Window)
   If (Not wiaSession.IsAvailable(WiaVersion.Version1)) Then
      MessageBox.Show("WIA version 1.0 not installed.")
      Return
   End If

   wia_Session = New WiaSession()
   wia_Session.Startup(WiaVersion.Version1)

   Dim res As DialogResult = wia_Session.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault)
   If res <> DialogResult.OK Then
      MessageBox.Show("Error selecting WIA device.")
      wia_Session.Shutdown()
      Return
   End If

   wia_Session.GetRootItem(Nothing)
   If Not wia_Session.RootItem Is Nothing Then
      AddHandler wia_Session.EnumItemsEvent, AddressOf session_EnumItemsEvent5

      wia_Session.EnumChildItems(wia_Session.RootItem)

      RemoveHandler wia_Session.EnumItemsEvent, AddressOf session_EnumItemsEvent5
   End If

   wia_Session.Shutdown()
End Sub

Private Sub session_EnumItemsEvent5(ByVal sender As Object, ByVal e As WiaEnumItemsEventArgs)
   If Not e.Item Is Nothing Then
      ' Get the item's system time.
      wia_Session.GetPropertySystemTime(e.Item, Nothing, WiaPropertyId.ItemTime)

      ' You can change the item's system time to your machine system time.
      wia_Session.SystemTimeValue = System.DateTime.Now
      wia_Session.SetPropertySystemTime(e.Item, Nothing, WiaPropertyId.ItemTime)

      wia_Session.FreeItem(e.Item)
   End If
End Sub
C#Copy Code
WiaSession wia_Session; 
public void GetPropertySystemTimeExample(IWin32Window parent) 
{ 
   if (!WiaSession.IsAvailable(WiaVersion.Version1)) 
   { 
      MessageBox.Show("WIA version 1.0 not installed."); 
      return; 
   } 
 
   wia_Session = new WiaSession(); 
   wia_Session.Startup(WiaVersion.Version1); 
 
   DialogResult res = wia_Session.SelectDeviceDlg(parent, WiaDeviceType.Default, WiaSelectSourceFlags.NoDefault); 
   if (res != DialogResult.OK) 
   { 
      MessageBox.Show("Error selecting WIA device."); 
      wia_Session.Shutdown(); 
      return; 
   } 
 
   wia_Session.GetRootItem(null); 
   if (wia_Session.RootItem != null) 
   { 
      wia_Session.EnumItemsEvent += new EventHandler<WiaEnumItemsEventArgs>(wiaSession_EnumItemsEvent5); 
 
      wia_Session.EnumChildItems(wia_Session.RootItem); 
 
      wia_Session.EnumItemsEvent -= new EventHandler<WiaEnumItemsEventArgs>(wiaSession_EnumItemsEvent5); 
   } 
 
   wia_Session.Shutdown(); 
} 
 
void wiaSession_EnumItemsEvent5(object sender, WiaEnumItemsEventArgs e) 
{ 
   if (e.Item != null) 
   { 
      // Get the item's system time. 
      wia_Session.GetPropertySystemTime(e.Item, null, WiaPropertyId.ItemTime); 
 
      // You can change the item's system time to your machine system time. 
      wia_Session.SystemTimeValue = System.DateTime.Now; 
      wia_Session.SetPropertySystemTime(e.Item, null, WiaPropertyId.ItemTime); 
 
      wia_Session.FreeItem(e.Item); 
   } 
}

Remarks

Call this function to retrieve a DateTime structure for any WIA property of type /// WiaVariableTypes.UI2 or WiaVariableTypes.Vector (for instance, and WiaPropertyId.DeviceTimeWiaPropertyId.ItemTime) to return the date and time of the item.

After calling this method the SystemTimeValue property will become available for you to use to get the retrieved system DateTime structure.

For more information, refer to Managing WIA Sources.

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows 2000, Windows XP, Windows Vista, Windows Server 2003 family, Windows Server 2008 family

See Also