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I have a project with one file that is a COM plugin for a hosting application.
In that code I can freely use AfxMessageBox(), or if I want a bit more control
I can also use MessageBox() like so:

MessageBox(NULL,"File Missing.","Error",MB_OK);

In another .cpp file in the same solution is a property page for my plugin that the host pops up from it's menu system I can again use AfxMessageBox() to my hearts content but MessageBox() throws up the compiler error:

'CWnd::MessageBoxA' : function does not take 4 arguments.

Intellisense in both file point to the define in winuser.h

I really would like to use MessageBox() in the property page so I can change the dialog title text.

Thanks for all your help in advance.

Posted 12-Jan-13 4:27am
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Solution 1

The chances are that in one case you are getting CWnd::MessageBox[^] and in the other Win API ::MessageBox[^]
It's difficult to tell without your code, but try putting the :: specifier in there as see it it corrects the problem.
Ron Anders at 12-Jan-13 11:04am
double comment
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Solution 2

In case 2 you are obviously calling it from within your CWnd derived class, so the correct call would be:
MessageBox("File Missing.","Error",MB_OK);
as described in the documentation[^].

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