Problem with MessageBox and UpdateData

From:

john.ambou@free.fr

Newsgroups:

microsoft.public.vc.mfc

Date:

11 May 2006 01:49:57 -0700

Message-ID:

<1147337397.902378.32410@j33g2000cwa.googlegroups.com>

Hello,

I develop a small MFC application when I put a button I can open my
hard disk and I choose a file. After to have choose, size and name of
the file are implemented in two variable of my new class.

In fact, to reduce my source file, I add a source fille (.cpp) where I
declare my function who open my hard directory, this is my source code
:

CString choix_film(int m_taille,CString m_essai2,CString m_essai1){

CString OpenFilter;
OpenFilter = "All Files (*.*)|*.*||";
CString s;

CFileDialog
FileOpenDialog(TRUE,NULL,NULL,OFN_FILEMUSTEXIST|OFN_HIDEREADONLY|OFN_PATHMUSTEXIST,OpenFilter,AfxGetMainWnd());

    if(FileOpenDialog.DoModal()==IDOK)
        {
        CFile File;

VERIFY(File.Open(FileOpenDialog.GetPathName(),CFile::modeRead));

    //Taille du fichier
    m_taille=(File.GetLength()/1048576);
    UpdateData(false);

    // Chemin du fichier
    m_essai2=File.GetFilePath();

    // Nom du fichier
    m_essai1=File.GetFileName();
    UpdateData(false);
    }
    return(m_essai2);
}

But when I build, UpdateData undeclared identifier error is display.
I have the same error with MessageBox and I don't understand.

Can you help me ?