Visual C++ ActiveX Controls Development Tutorial166

ActiveX controls are reusable software components that can be used in a variety of applications, including web pages, desktop applications, and mobile apps. They are typically written in C++ and can be used to add functionality to an application without having to rewrite the entire application.

In this tutorial, we will learn how to create an ActiveX control using Visual C++. We will start by creating a new project in Visual C++ and then add an ActiveX control to the project. We will then write the code for the control and test it in a web page.

Creating a New Project

To create a new project in Visual C++, open Visual C++ and click on the "File" menu. Then, select "New" and then "Project...". In the "New Project" dialog box, select the "Visual C++" template and then select the "ActiveX Control" project type. Enter a name for the project and then click on the "OK" button.

Adding an ActiveX Control to the Project

Once you have created a new project, you need to add an ActiveX control to the project. To do this, right-click on the project in the Solution Explorer and then select "Add" and then "New Item...". In the "Add New Item" dialog box, select the "ActiveX Control" template and then enter a name for the control. Click on the "Add" button to add the control to the project.

Writing the Code for the Control

Once you have added an ActiveX control to the project, you need to write the code for the control. The code for an ActiveX control is typically written in C++. The following is an example of a simple ActiveX control that displays the text "Hello, world!":```cpp
#include
#include
class HelloControl : public CComControl
{
public:
BEGIN_COM_MAP(HelloControl)
COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()
DECLARE_PROTECT_FINAL_CONSTRUCT()
HRESULT FinalConstruct()
{
return S_OK;
}
void OnDraw(ATL_DRAWINFO& di)
{
RECT rc;
->GetClipBox(&rc);
->DrawText(_T("Hello, world!"), -1, &rc, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
}
};
OBJECT_ENTRY_AUTO(CLSID_HelloControl, HelloControl)
```

Testing the Control

Once you have written the code for the control, you can test it in a web page. To do this, open a web page in your favorite web browser and then drag and drop the ActiveX control onto the web page. The control will appear on the web page and you will be able to interact with it.

Conclusion

In this tutorial, we learned how to create an ActiveX control using Visual C++. We started by creating a new project in Visual C++ and then added an ActiveX control to the project. We then wrote the code for the control and tested it in a web page.

2024-12-26

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