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Asked: 2026-06-11T05:28:35+00:00

Possible Duplicate: static , extern , const in header file I am working in

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Possible Duplicate:
static, extern, const in header file

I am working in Visual C++ and having this error.

I have declared below two extern lines in global.h seperately. 

extern CSocketManager  m_SocketManager[10];
extern CSocketManager* m_pCurServer; 

1>ServerSocketDlg.obj : error LNK2001: unresolved external symbol "class CSocketManager *                      m_pCurServer" (?m_pCurServer@@3PAVCSocketManager@@A)

1>SocketManager.obj : error LNK2001: unresolved external symbol "class CSocketManager * m_pCurServer" (?m_pCurServer@@3PAVCSocketManager@@A)

Does anyone have an idea what might cause these errors?

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1 Answer

  1. Editorial Team

    Objects declared in the .h as extern also have to be declared in a .cpp file.

    The problem is that linker doesn’t know where to find the two objects.

    Solution: you also have to declare m_pCurServer in the .cpp file because it’s the .cpp that is being compiled, not the header.

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