In This Topic ▼

GetPropertyString Method

Summary

Retrieves a string buffer for any WiaVariableTypes.Bstr property.

Syntax

C++

public string GetPropertyString( 
   object item, 
   string propertyIdName, 
   WiaPropertyId propertyId 
)

  
Public Function GetPropertyString( _ 
   ByVal item As Object, _ 
   ByVal propertyIdName As String, _ 
   ByVal propertyId As WiaPropertyId _ 
) As String

public: 
String^ GetPropertyString(  
   Object^ item, 
   String^ propertyIdName, 
   WiaPropertyId propertyId 
)

Parameters

item
Handle to the item which represents the item having the property. Retrieve this parameter by either calling the GetRootItem method to get the device's root item itself, or by enumerating the child items of the device through a call to the EnumChildItems method.

propertyIdName
This string should contain the equivalent property Id string for the WIA property ID. Use the 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 parameter 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 a 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.

Return Value

The WIA string value.

Remarks

Call this function to retrieve the string buffer value for any WIA property of type WiaVariableTypes.Bstr (for instance, WiaPropertyId.DeviceInfoDevName , WiaPropertyId.ItemFullItemName , ...etc).

For more information, refer to Managing WIA Sources.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Wia; 
 
public void GetPropertyStringExample(IntPtr 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.DigitalCamera, WiaSelectSourceFlags.NoDefault); 
   if (res != DialogResult.OK) 
   { 
      MessageBox.Show("Error selecting WIA device."); 
      wiaSession.Shutdown(); 
      return; 
   } 
 
   object rootItem = wiaSession.GetRootItem(null); 
   if (rootItem != null) 
   { 
      // If you have a digital camera device that supports the EXIF format, you  
      // can populate the artist field in every EXIF image that it captures. 
      string stringValue = wiaSession.GetPropertyString(rootItem, null, WiaPropertyId.CameraDeviceArtist); 
      Console.WriteLine("Old Device Artist: {0}", stringValue); 
 
      // You can also change the artist if you want. 
      stringValue = "I am the new artist."; 
      wiaSession.SetPropertyString(rootItem, null, WiaPropertyId.CameraDeviceArtist, stringValue); 
      stringValue = wiaSession.GetPropertyString(rootItem, null, WiaPropertyId.CameraDeviceArtist); 
      Console.WriteLine("New Device Artist: {0}", stringValue); 
   } 
 
   wiaSession.Shutdown(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Wia 
 
<TestMethod()> _ 
Public Sub GetPropertyStringExample(ByVal parent As IntPtr) 
   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.DigitalCamera, WiaSelectSourceFlags.NoDefault) 
   If res <> DialogResult.OK Then 
      MessageBox.Show("Error selecting WIA device.") 
      session.Shutdown() 
      Return 
   End If 
 
   Dim rootItem As Object = session.GetRootItem(Nothing) 
   If Not rootItem Is Nothing Then 
      ' if you have a digital camera device that supports the EXIF format, you  
      ' can populate the artist field in every EXIF image that it captures. 
      Dim stringValue As String = session.GetPropertyString(rootItem, Nothing, WiaPropertyId.CameraDeviceArtist) 
      Console.WriteLine("Old Device Artist: {0}", stringValue) 
 
      ' You can also change the artist field if you want. 
      stringValue = "I am the new artist." 
      session.SetPropertyString(rootItem, Nothing, WiaPropertyId.CameraDeviceArtist, stringValue) 
      stringValue = wiaSession.GetPropertyString(rootItem, Nothing, WiaPropertyId.CameraDeviceArtist) 
      Console.WriteLine("New Device Artist: {0}", stringValue) 
   End If 
 
   session.Shutdown() 
End Sub