谁能告诉我这个函数作用
是不是职能初始化全局的数据，还有我的Dll里封装了一个类
这时，我的WINAPI DllMain函数该怎么写
要不要在类的.h文件里申明，然后在.cpp 文件里实现？？？

//.h文件
#if !defined(AFX_MANAGESTU_H__7390B43D_3BBE_45C3_BBD2_0A761B8AEBFD__INCLUDED_)
#define AFX_MANAGESTU_H__7390B43D_3BBE_45C3_BBD2_0A761B8AEBFD__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#ifndef MYAPI
#define MYAPI _declspec(dllexport)
#endif
typedef struct MStu
{
    CString no;
    char    subject[1];
}*Stu;
BOOL WINAPI DllMain(HANDLE, DWORD, LPVOID);
class MYAPI CManageStu  
{
public:
    CManageStu();
    virtual ~CManageStu();
    void Add(Stu student);
    void Delete(Stu student);
    void Update(Stu student);
private:
    CPtrList plist;
};


#endif // !defined(AFX_MANAGESTU_H__7390B43D_3BBE_45C3_BBD2_0A761B8AEBFD__INCLUDED_)

//.cpp文件
#include "stdafx.h"
#include "CManageStu.h"
#include "ManageStu.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CManageStu::CManageStu()
{
    
    plist.GetHead() = NULL;

}

CManageStu::~CManageStu()
{
    
}

void CManageStu::Add(Stu student)
{
    plist.AddTail((LPCSTR*)student);
}
void CManageStu::Delete(Stu student)
{
    POSITION pos = NULL;
    pos = (POSITION)plist.GetHead();
    while(pos != NULL)
    {
        if(((Stu)pos)->no == student->no)
        {
            plist.RemoveAt((POSITION)pos);
            free(student);
        }
        plist.GetNext(pos);
    }
    
}
void CManageStu::Update(Stu student)
{
    POSITION pos = NULL;
    pos = (POSITION)plist.GetHead();
    while(pos != NULL)
    {
        if(((Stu)pos)->no == student->no)
        {
            ((Stu)pos)->no = student->no;
            ((Stu)pos)->subject[0] = student->subject[0];
            ((Stu)pos)->subject[1] = student->subject[1];
        }
        plist.GetNext(pos);
    }
}
BOOL WINAPI DllMain(HANDLE, DWORD, LPVOID)
{
    switch()
    {
    case DLL_PROCESS_ATTACH:
        //在这里我该怎么初始化申明的结构体该怎么new???
        break;
    case DLL_PROCESS_DETACH:

        break;
    default:
    }
}