Wish to access previous CDocument items when a new one is opened in MFC.

[navztech]

I open a new document, but I need access to the previous document. I can Close and Save the previous document, but I simply can't get access to the objects in that document.

I have attached the code below

BOOL CVSTADoc::OnOpenDocument(LPCTSTR lpszPathName)
{    
    if (!CDocument::OnOpenDocument(lpszPathName))
        return FALSE;
    POSITION myPos = GetDocTemplate()->GetFirstDocPosition();
    CDocument *myDoc = GetDocTemplate()->GetNextDoc(myPos);
    if (myDoc != this)
    {
             /* Need code for this */
    }
    return TRUE;
}

Now I have an Array in CVSTADoc which I need access to and that document is on "myDoc" position in the if condition.
Any help?

[Roger Allen]

You just need to access it as a normal object, but as your the same class type, the compiler assumes you know what your doing so you can access all the variables as if they are public.

if (mydoc != NULL)
{
m_myArray = myDoc->m_myArray; // works if its a vector
// otherwise do a manual copy
}

[navztech]

CVSTADoc is derived from CDocument. The array I want say "m_myArray" is an object in CVSTADoc class. myDoc on the other hand is a CDocument.

After using your code this is the error I got...

error C2039: 'm_myArray' : is not a member of 'CDocument'

essentionally

myDoc->m_myArray

is not legal.

[GCDEF]

You just need to cast myDoc to the appropriate type.

[navztech]

Ok, Im really new to MFC.

by casting do you mean something like this?

CVSTADoc *pDoc = (CVSTADoc) myDoc;

It doesn't work.

Sorry if I sound ignorant, but like I said Im fairly new to MFC.

[GCDEF]

CVSTADoc *pDoc = (CVSTADoc*) myDoc;

Note the * in the cast.