class memory allocation error

[cisotta]

I'm struggling with this problem:
A class that I've built has 3 member variables, 13 variables that are associated with dialog controls and 13 member functions.
Starting from this point, if I try to add another member variable, of whatever type, with whatever name, it cause an error message when the program start: "unhandled exception in scena.exe 0xc000005: Access Violation". I can't explain this!
No problem if I add instead a member function, the application goes on working.

In InitInstance the class I've built is started this way:
CScenaDlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();

Can anyone help me?
thanks,
francesco

 

[Masi]

Hi,
why you set m_pMainWnd = &dlg; ?
To start a dialog it's enough:
CScenaDlg dlg;
int nResponse = dlg.DoModal();

Have a look at the calling stack:
wich is the last C instruction you see?
Access Violation normally has to do with invalid pointers
Tell us more

 

[PerFnurt]

  CScenaDlg dlg;
  m_pMainWnd = &dlg;
  int nResponse = dlg.DoModal();

This is standard MFC dialog app design (Masi:including setting the m_pMainWnd). ALL MFC dialog applications does this. You need to give us more info - particulary concerning the code you have written.
What does CScenaDlg's constructor and OnInitDialog do? Show code rather than explain with words.

/Per
[sub]
"It was a work of art, flawless, sublime. A triumph equaled only by its monumental failure."[/sub]

 

[cisotta]

I'm very sorry to have bothered you, the error was caused by a silly variable address storing.

The dialog app design had set these two lines aligned to left:

CScenaDlg dlg;
extern CScenaDlg *pScenaWnd;
pScenaWnd = &dlg;
m_pMainWnd = &dlg;

I have added the two indented lines in the middle, and the error was produced by the very last line. I changed it to:
m_pMainWnd = pScenaWnd
since it already contain the address of dlg, and all seems work right now!

Can't explain why....

Thanks to you
francesco