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How to Use ActiveX Controls in Windows Applications

ActiveX is a framework for defining reusable software components in a networked environment, particularly within Microsoft's Windows operating systems. It allows applications to share information and functionality and is commonly used in Internet Explorer to run interactive content like videos and games. Understanding how to use ActiveX controls can be crucial for developers who need to create or maintain applications that rely on these components.

In this article, we will explore how to create and use ActiveX controls in Windows applications. We will cover the basics of ActiveX, demonstrate how to create an ActiveX control using Visual Studio, and show how to run and manage these controls via the Command Prompt (CMD) and PowerShell.

Examples:

  1. Creating an ActiveX Control in Visual Studio:

    To create an ActiveX control, you need to have Visual Studio installed on your system. Follow these steps:

    • Open Visual Studio and create a new project.
    • Select "MFC ActiveX Control" from the project templates.
    • Name your project and click "Create."
    • Follow the wizard to set up your ActiveX control, defining properties and methods as needed.

    Here is a simple example of an ActiveX control that displays a message box:

    // MyActiveXControl.cpp
#include "pch.h"
#include "MyActiveXControl.h"

IMPLEMENT_DYNCREATE(CMyActiveXControl, COleControl)

BEGIN_MESSAGE_MAP(CMyActiveXControl, COleControl)
END_MESSAGE_MAP()

BEGIN_DISPATCH_MAP(CMyActiveXControl, COleControl)
   DISP_FUNCTION(CMyActiveXControl, "ShowMessage", ShowMessage, VT_EMPTY, VTS_NONE)
END_DISPATCH_MAP()

void CMyActiveXControl::ShowMessage()
{
   AfxMessageBox(_T("Hello from ActiveX Control!"));
}

  2. Registering the ActiveX Control:

    After building your ActiveX control, you need to register it so that it can be used by other applications. You can do this using the Command Prompt:

    regsvr32 MyActiveXControl.ocx

    If the registration is successful, you will see a confirmation message.

  3. Using ActiveX Control in Internet Explorer:

    To use your ActiveX control in an HTML page, you can embed it using the <object> tag:

    <html>
<body>
   <object id="MyControl" classid="clsid:YOUR-CLSID-HERE"></object>
   <script type="text/javascript">
       document.getElementById('MyControl').ShowMessage();
   </script>
</body>
</html>

  4. Managing ActiveX Controls with PowerShell:

    You can use PowerShell to list and manage ActiveX controls. For example, to list all registered ActiveX controls, you can use the following command:

    Get-ItemProperty -Path "HKLM:\Software\Classes\CLSID\*" | Where-Object { $_.PSChildName -match "^\{.*\}$" } | Select-Object PSChildName, (Get-ItemProperty -Path { $_.PSPath }).FriendlyTypeName

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Windows CMD PowerShell ActiveX Visual Studio regsvr32 Internet Explorer HTML JavaScript MFC

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