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Registry keys!

Posted on 1999-01-19
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Last Modified: 2013-11-20
I want to set and recall registry keys. I want to recall them obviously when the program first starts up and then write the keys just before the window closes. How do I do this!!! The registry functions are included in CWinApp and I cannot call these functions in my CWnd class because I cannot declare a second CWinApp and get away with it. I created a dialog based MFC shared dll project. There is just one main dialog to my program and I want to be able to use the registry to store my windows position. Any suggestions?
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Question by:ducktape
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LVL 15

Expert Comment

by:Tommy Hui
ID: 1327987
You don't need to declare another instance of CWinApp. You do need to declare it as extern though. Assuming CMyWinApp is derived from CWinApp, you can use the following:

  extern CMyWinApp theApp;

  BOOL CMyDialog::OnInit()
  {
    theApp.GetProfileInt(...);
    // or any other registry function
  }
  }
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Author Comment

by:ducktape
ID: 1327988
I tried this and the app crashes upon shutdown. I have two classes CMyApp and CMyDialog. Inside CMyApp I put the keyword 'extern' before CMyApp theApp; and then tried to call the member functions of CMyApp from CMyDialog and got an undeclared identifier error when doing so. Is this the way? Or did I do something wrong? Also when I put the keyword 'extern' in front of CMyApp theApp; it made this declaration disapear from the 'global' listing in the 'class view.' I am working with VC++5.0. Any suggestions?
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Accepted Solution

by:
bheld earned 200 total points
ID: 1327989
Try calling AfxGetApp() which returns a CWinApp*.  You may need to cast this to CMyApp using

CMyApp* pApp = ((CMyApp*)AfxGetApp());

you also want to check that AfxGetApp doesn't return NULL
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Author Comment

by:ducktape
ID: 1327990
Awesome! It works now! You da man. ;)
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