关于类的重命名问题

[rundll64]

//MyProcess.h
#pragma once
namespace Process
{	
	HTREEITEM m_hRoot;
	void addRoot(char* szBuffer, CTreeCtrl& mtree);
	class CMyProcess
	{
	public:
		CMyProcess(void);
		~CMyProcess(void);
	};
}

//MyProcess.cpp
void Process::addRoot(char* str, CTreeCtrl& mtree)
{
	CString s(str);
	mtree.DeleteAllItems();
	m_hRoot = mtree.InsertItem(GetValue(s,L"deptName"));
}

在StdAfx.h中
#include "MyProcess.h"
using namespace Process;

1>stdafx.obj : error LNK2005: "struct _TREEITEM * Process::m_hRoot" (?m_hRoot@Process@@3PAU_TREEITEM@@A) 已经在 MyProcess.obj 中定义
1>C:\VC\VS9\iMsnDlg\Debug\iMsnDlg.dll : fatal error LNK1169: 找到一个或多个多重定义的符号


编译过程中出现以上错误

[微型蚂蚁]

MyProcess.h 中写成 extern HTREEITEM m_hRoot; MyProcess.cpp加入 HTREEITEM Process::m_hRoot = NULL;