C++: Debug assertion failed, afx.inl line 122

Question

here is the description of the problem.

I have the following class defined..

class classA {
public:
  CString aString;
};
extern classA theApp;

in another class function, I do this

theApp.aString = "test string";

then I get the runtime error debug assertion failed, afx.inl line 122; please advise.

I tried to do the allocation inside the class as well but it fails flagging the same runtime error.

 class classA {
    public:
      CString aString;
      void set_string()
      {
          aString = "test string 2";
      }
    };
    extern classA theApp;

    //in another class function

    theApp.set_string();

visual c++ version: VC++ 6.0

Answer 1

afx.inl` line 122: ASSERT(m_pchData != NULL); return ((CStringData*)m_pchData)-1; }

It seems, that your theApp variable is not initialized properly, since its members aString internal buffer is NULL , check that you are not making an assignment before its initialization.

Also ensure that you have the latest service pack (SP6) installed for the Visual Studio 6.