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IFeatureSupport Interface

Specifies a standard interface for retrieving feature information from the current system.

For a list of all members of this type, see IFeatureSupport Members.

[Visual Basic]
Public Interface IFeatureSupport
[C#]
public interface IFeatureSupport
[C++]
public __gc __interface IFeatureSupport
[JScript]
public interface IFeatureSupport

Classes that Implement IFeatureSupport

Class Description
FeatureSupport Provides static (Shared in Visual Basic) methods for retrieving feature information from the current system.

Remarks

When implemented in a class, IFeatureSupport provides methods you can use to determine whether a feature is currently installed on the system and to get the version number of a feature. Call IsPresent to determine whether a feature, or a specific version of a feature, is currently installed. Call GetVersionPresent to determine the version number of an installed feature.

See the FeatureSupport and OSFeature classes for implementations of this interface.

Example

[Visual Basic, C#, C++] The following example uses the OSFeature implementation of IFeatureSupport and queries for the LayeredWindows feature. The version is checked to see if it is a null reference (Nothing in Visual Basic), to determine whether the feature is present. The result is displayed in a text box. This code assumes textBox1 has been created and placed on a form.

[Visual Basic] 
Private Sub LayeredWindows()
    ' Gets the version of the layered windows feature.
    Dim myVersion As Version = _
       OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows)
       
    ' Prints whether the feature is available.
    If Not (myVersion Is Nothing) Then
        textBox1.Text = "Layered windows feature is installed." & _
           ControlChars.CrLf
    Else
        textBox1.Text = "Layered windows feature is not installed." & _
           ControlChars.CrLf
    End If 
    'This is an alternate way to check whether a feature is present.
    If OSFeature.Feature.IsPresent(OSFeature.LayeredWindows) Then
        textBox1.Text &= "Again, layered windows feature is installed."
    Else
        textBox1.Text &= "Again, layered windows feature is not installed."
    End If
End Sub


[C#] 
private void LayeredWindows() {
   // Gets the version of the layered windows feature.
   Version myVersion = OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows);

   // Prints whether the feature is available.
   if (myVersion != null)
      textBox1.Text = "Layered windows feature is installed." + '\n';
   else
      textBox1.Text = "Layered windows feature is not installed." + '\n';

   // This is an alternate way to check whether a feature is present.
   if (OSFeature.Feature.IsPresent(OSFeature.LayeredWindows))
      textBox1.Text += "Again, layered windows feature is installed.";
   else
      textBox1.Text += "Again, layered windows feature is not installed.";
}


[C++] 
private:
 void LayeredWindows() {
    // Gets the version of the layered windows feature.
    Version* myVersion = OSFeature::Feature->GetVersionPresent(OSFeature::LayeredWindows);
 
    // Prints whether the feature is available.
    if (myVersion != 0)
       textBox1->Text = S"Layered windows feature is installed.\n";
    else
       textBox1->Text = S"Layered windows feature is not installed.\n";
 
    // This is an alternate way to check whether a feature is present.
    if (OSFeature::Feature->IsPresent(OSFeature::LayeredWindows))
       textBox1->Text = String::Concat( textBox1->Text, S"Again, layered windows feature is installed." );
    else
       textBox1->Text = String::Concat( textBox1->Text, S"Again, layered windows feature is not installed." );
 }
 

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Windows.Forms

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

See Also

IFeatureSupport Members | System.Windows.Forms Namespace | FeatureSupport | OSFeature

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