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Global Variable

Posted on 1998-09-06
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Last Modified: 2013-11-20
Can I delcare a global variable in Viusal C++ 5.0?

I want to have a variable that can be used by two *.cpp files.
eg.
I used the class CListView to display all data in the
Window. After clicking one of the items, I want the value
of this itemc can be displayed on the dialog box.
Until now, I cannot do this in using two *.cpp files.

Thanks for your help!!!
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Question by:cplau
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2 Comments
 
LVL 23

Accepted Solution

by:
chensu earned 80 total points
ID: 1321808
Yes, you can.

For example,

// 1.h
extern int g_nVal;  // declaration

// 1.cpp
#include "1.h"

int g_nVal = 1;  // definition

// 2.cpp
#include "1.h"

g_nVal = 2;  // reference


Another way is to define it as a member variable of the derived CWinApp class.

class CMyWinApp : public CWinApp
{
//...
    public:
        int m_nVal;
//...
};

((CMyWinApp *)::AfxGetApp())->m_nVal = 2;

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Author Comment

by:cplau
ID: 1321809
very helpful
0

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