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AxHost.AttachInterfaces Method

When overridden in a derived class, attaches interfaces to the underlying ActiveX control.

[Visual Basic]
Protected Overridable Sub AttachInterfaces()
[C#]
protected virtual void AttachInterfaces();
[C++]
protected: virtual void AttachInterfaces();
[JScript]
protected function AttachInterfaces();

Remarks

Notes to Inheritors:  Classes that extend AxHost should override this method. Within an overridden version of this method, the extending class should call GetOcx to retrieve its own interface. In most cases, the GetOcx method should not be called before this method is called.

Example

[C#] The following example overrides the constructor, and the SetAboutBoxDelegate and AttachInterfaces methods of an AxHost derived class that wraps the Microsoft Masked Edit ActiveX Control. This code assumes you have created the generated source code by running the AxImp.exe on the MSMask32.ocx file with the /source switch to generate the wrapper class to be edited. This code is only shown in C# syntax as that is the the only language output by the AxImp.exe.

[C#] 
public AxMaskEdBox() : 
  base("c932ba85-4374-101b-a56c-00aa003668dc") // The ActiveX control's class identifier.
{
   // Make the AboutBox method the about box delegate.
   this.SetAboutBoxDelegate(new AboutBoxDelegate(AboutBox));
}
        
public virtual void AboutBox() 
{
   // If the instance of the ActiveX control is null when the AboutBox method 
   // is called, raise an InvalidActiveXStateException exception.
   if ((this.ocx == null)) 
   {
      throw new System.Windows.Forms.AxHost.InvalidActiveXStateException(
        "AboutBox", System.Windows.Forms.AxHost.ActiveXInvokeKind.MethodInvoke);
   }
   // Show the about box if the ActiveX control has one.
   if(this.HasAboutBox)
   {
      this.ocx.AboutBox();
   }
}

protected override void AttachInterfaces() 
{
   try 
   {
      // Attach the IMSMask interface to the ActiveX control.
      this.ocx = ((MSMask.IMSMask)(this.GetOcx()));
   }
   catch (System.Exception ex) 
   {
      System.Console.WriteLine(ex.Message);
   }
}

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

Requirements

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

See Also

AxHost Class | AxHost Members | System.Windows.Forms Namespace | GetOcx

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