Re: Button error

at first , i must say sorry to ererbody : because my wrong operation so
that i send the same question many times!

//a.h
#include "GSDOC .h "
class CA : public CDialog
{
 public :
       CGASDoc * pDoc ;
       void someaction();
       int m_dmaxA;
}

 I thought "CGASDoc * pDoc" is the initialization and now i know it
is wrong :


I write the initialization as blew :
                              POSITION
pos=AfxGetApp()->GetFirstDocTemplatePosition();
            CGASDoc* pDoc;
            while(pos!=NULL)
            {
              pDoc= (CGASDoc*)AfxGetApp()->GetNextDocTemplate(pos); }
                            pDoc->m_dmaxA=m_dmaxA=dlg.m_dmaxA;

and it run right before i close the SDI applicant program, and I don't
know WHY ???

And to David Wilkinson :
thank you , I understand your said .But with using
"pDoc->m_maxA=m_maxA" ,I want to update the dada in the GASDoc ,and
used in the as below :

//D . h
#include "GASDoc .h "
//D . cpp
void CD ::OnSomeAct()
{
   if (pDoc ->m_maxA >Number )
   DoSomething ();
}

because I use :
       CB dlg;
       if(dlg.DoModal()==IDOK) //

just once in the CB.cpp , and i want to updatedata :

              m_dmaxA=dlg.m_dmaxA;
              pDoc->m_dmaxA=m_dmaxA;
so I cannot use your way .Do I really understand your meaning?