ACTIVEX CONTROL

Ø An ActiveX control is a reusable software component based on the Component Object Model (COM) that supports a wide variety of OLE functionality and can be customized to fit many software needs. ActiveX controls are designed for use both in ordinary ActiveX control containers and on the Internet, in World Wide Web pages.

Ø Interaction Between an ActiveX Control Container and a Windowed ActiveX Control

                        

Ø An ActiveX control can draw itself in its own window, respond to events (such as mouse clicks), and be managed through an interface that includes properties and methods.

Ø These controls can be developed for many uses, such as database access, data monitoring, or graphing.

Ø  An ActiveX control is controlled by using three things:

a. Property: Attribute of the control that can be modified by container application. (like name, background color, Font etc)

b. Methods: Functions called by container application.

c. Events: The Messages that can be send from control to the container application.

Steps to create ActiveX Control:

File->New->Project->Select MFC ActiveX Control Wizard->Specify    Project name(say ActiveXDemo)->Click OK

         Now invoke the class wizard and add properties and appropriate messages from there(like WM_LBUTTONDOWN)

         Then Edit the code in ActiveXDemoCtl.cpp for WM_LBUTTONDOWN:

Void CActiveXDemoCtrl::OnLButtonDown(UINT flag,CPointpt)

{

MessageBox(“Left Button is Pressed”);

}