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C / C++ / MFC

Codzer17-Dec-12 19:23

17-Dec-12 19:23

In InitInstace after OnFileNew() called, its was found m_phWnd is null. OnFileNew() is default implementation of mfc.

Please help me out.

Re: CWinApp::OnFileNew failed ?

Jochen Arndt17-Dec-12 21:33

Jochen Arndt

17-Dec-12 21:33

You should provide more information to get help. Use the 'Edit' link below your post to do this (e.g. add a short code snippet).

What is the class for m_phWnd (there is no CWinApp member with this name?

Re: CWinApp::OnFileNew failed ?

Codzer18-Dec-12 2:48

Codzer

18-Dec-12 2:48

Actually I had wrongly mention the member name, it is m_pMainWnd.

I am sorry, I cannot provide the code snippet.

Re: CWinApp::OnFileNew failed ?

Jochen Arndt18-Dec-12 3:03

Jochen Arndt

18-Dec-12 3:03

m_pMainWnd is not set by MFC. It is provided to be used in your code. Common usage is to assign the address of your main frame window (or the main dialog with dialog based applications) upon creation in InitInstance():

C++

CMyApp::InitInstance()
{
...
    // create main frame window; CMainFrame is your CFrameWnd derived class
    CMainFrame * pMainFrame = new CMainFrame;
    // load menus, accelerators, icons
    if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
        return FALSE;
    m_pMainWnd = static_cast<CWnd*>(pMainFrame);
...
}

Purpose is to have access to your main frame class from all modules of your app:

C++

CMainFrame * pMainFrame = static_cast<CMainFrame*>(AfxGetApp()->m_pMainWnd);

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