如何将类CWnd转换为struct HWND? (将AfxGetApp()-> m_pMainWnd转换为HWND) [英] How can I convert class CWnd to struct HWND? (Converting AfxGetApp()->m_pMainWnd to HWND)

问题描述

当我想在某些情况下使用Win32 API函数时，需要使用App的HWND作为输入参数.
在MFC中，我使用了AfxGetApp()->m_pMainWnd，但是我从VC6编译器中收到了以下消息:

Hi, When I want to use Win32 API functions in some cases it''s need to use the HWND of App as an input parameter.
In MFC I used AfxGetApp()->m_pMainWnd but I got this message from VC6 compiler:

error C2440: ''='' : cannot convert from ''class CWnd *'' to ''struct HWND__ *''.

顺便说一下，我对HINSTANCE参数也有同样的问题.

谢谢.

By the way I have the same problem with HINSTANCE parameters.

Thanks.

推荐答案

您应该尊重CWnd指针:使用*AfxGetMainWnd()就足够了，因为CWnd实现了HWND强制转换运算符. > 例如:

You should deference the CWnd pointer: using *AfxGetMainWnd() is enough, since CWnd implements the HWND cast operator.
For instance:

::SetWindowText(*AfxGetMainWnd(), _T("Hi Folks"));

AfxGetApp()->m_pMainWnd是CWnd*，而CWnd类具有名为m_hWnd的HWND成员.
因此，您可以将其用作AfxGetApp()->m_pMainWnd->m_hWnd.

AfxGetApp()->m_pMainWnd is a CWnd* and the CWnd class has a HWND member called m_hWnd.

So you could use it as AfxGetApp()->m_pMainWnd->m_hWnd.

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