为什么GetSafeHwnd（）在ActiveX控件中返回零？ [英] Why does GetSafeHwnd() return zero in an ActiveX control?

问题描述

我已经开发了一个MFC ActiveX控件，在运行时是无窗和隐形的，而我认为基本上activex是一个控制，将操纵一个窗口句柄，我使用 GetSafeHwnd（）获取Windows句柄，但不幸的是，该方法在运行时返回零。也许我在创建我的activex时设置错误的选项。如何创建一个无窗的activex可以操纵windows hanlde？

解决方案

根据定义，无窗ActiveX控件没有窗口，并且作为其父对象的一部分呈现。如果要在控件中使用Windows消息，可以创建具有消息循环的工作线程，并处理任何消息。要有消息循环，你不需要一个窗口，只是线程。

或者，您可以通过更改其属性来使用窗口化的ActiveX控件。

I have developed a MFC Activex control which is windowless and invisible in runtime, while i assumed that basically an activex is a control that would manipulate a windows handle, i have used GetSafeHwnd() to get windows handle, but unfortunately this method returns zero when it runs. maybe i had set wrong option when creating my activex. how i can create a windowless activex which could manipulate windows hanlde?

解决方案

By definition, windowless ActiveX control doesn't have a window, and rendered as part of its parent. If you want to work with Windows messages in the control, you can create worker thread with a message loop, and handle any messages there. To have message loop, you don't need a window, just thread. This solution can be implemented in windowless control or in any COM component.

Alternatively, you can use windowed ActiveX control by changing its properties.

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