ActiveX Control Development Tutorial Using C182

Introduction

In this tutorial, we will guide you through the steps of developing an ActiveX control using C. We will cover the basics of ActiveX control development, including creating the control project, implementing the control's functionality, and registering the control so that it can be used in other applications.

Prerequisites

Before you begin, you will need to have the following installed on your system:
Microsoft Visual Studio
The ActiveX SDK

Creating the Control Project

To create a new ActiveX control project in Visual Studio, open Visual Studio and click on "File" > "New" > "Project". Select the "Visual C#" or "Visual Basic" project type and then select the "ActiveX Control Library" template. Enter a name for your project and click "OK".

Visual Studio will create a new project for you. The project will contain a number of files, including a header file (.h), an implementation file (.cpp), and a resource file (.rc). The header file will contain the declarations for the control's interface, and the implementation file will contain the code for the control's functionality. The resource file will contain the control's icon and other resources.

Implementing the Control's Functionality

The next step is to implement the control's functionality. This involves writing code to handle the control's events, properties, and methods.

To handle an event, you must first declare the event in the control's header file. For example, to declare an event that is fired when the user clicks on the control, you would add the following line to the header file:```
event EventHandler Click;
```

You can then handle the event in the control's implementation file by adding the following code:```
void CMyControl::OnClick(Object^ sender, EventArgs^ e)
{
// Code to handle the event
}
```

To create a property, you must first declare the property in the control's header file. For example, to create a property that stores the control's text, you would add the following line to the header file:```
property String Text;
```

You can then implement the property in the control's implementation file by adding the following code:```
String CMyControl::get_Text()
{
return m_text;
}
void CMyControl::set_Text(String value)
{
m_text = value;
}
```

To create a method, you must first declare the method in the control's header file. For example, to create a method that sets the control's text, you would add the following line to the header file:```
void SetText(String text);
```

You can then implement the method in the control's implementation file by adding the following code:```
void CMyControl::SetText(String text)
{
m_text = text;
}
```

Registering the Control

Once you have implemented the control's functionality, you need to register the control so that it can be used in other applications. To register the control, open the Control Panel and click on "Administrative Tools" > "Component Services".

In the Component Services window, expand the "Components" node and right-click on the "ActiveX Controls" folder. Click on "New" and browse to the location of your control's DLL file. The DLL file will be located in the bin\debug folder of your project.

Once you have selected the DLL file, click on "OK". The control will be registered and will be available for use in other applications.

Conclusion

In this tutorial, we have covered the basics of ActiveX control development using C. We have shown you how to create a new control project, implement the control's functionality, and register the control so that it can be used in other applications.

2024-12-08

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