调用导出dll中的类成员函数 - error LNK2019: 无法解析的外部符号

///
//
/***************************************************
  ShareInterface.h -- interface of dll library import and export
  version 1.0.8, Jan 27th, 2016

  Copyright (C) 2015-2016 Acheld CHEN

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Acheld CHEN       
  http://blog.csdn.net/acheld
  
 ****************************************************/
#pragma once


#ifdef _FX_EXPORT_INTERFACE
#define FX_SHAREAPI extern "C" __declspec(dllexport)
#else
#define FX_SHAREAPI extern "C" __declspec(dllimport)
#endif

//error LNK2019: 无法解析的外部符号 "public: void __thiscall ShareInterface::Init(void)" (?Init@ShareInterface@@QAEXXZ)，
//该符号在函数 "public: void __thiscall CFileOperationDlg::ShareDllTestFnc(void)" (?ShareDllTestFnc@CFileOperationDlg@@QAEXXZ) 中被引用
 //class /*__declspec(dllexport)*/ ShareInterface
 class __declspec(dllexport) ShareInterface
{
public:
	ShareInterface(void);
	~ShareInterface(void);
public:
	void Init();
	int RunShare(DWORD_PTR dwPtr , int nType = 0);
protected:
	char* m_lpName;
	int m_nIndex;
};



FX_SHAREAPI void FXShareApiTest(DWORD_PTR dwPtr = NULL);
FX_SHAREAPI void FXShareApi(DWORD_PTR dwPtr = NULL);
FX_SHAREAPI int FXStart(DWORD_PTR dwPtr, int nType = 0);
FX_SHAREAPI BOOL FXStop(DWORD_PTR dwPtr, LPARAM lparam,int nType = 0);
FX_SHAREAPI ShareInterface* FXShareInterface(DWORD_PTR& dwPtr);

//
//ShareInterface.cpp
//
#include "StdAfx.h"
#include "ShareInterface.h"


ShareInterface::ShareInterface(void)
{
	m_nIndex = 0X01;
	m_lpName = NULL;
	m_lpName = new char[65];
	strcpy(m_lpName,"ShareInterface");
}


ShareInterface::~ShareInterface(void)
{
	m_nIndex =0;
	m_lpName = NULL;
}

void ShareInterface::Init()
{
	MessageBox(NULL,(LPCTSTR)"ShareInterface::Init()",(LPCTSTR)"ShareInterface",MB_OK);
}

int ShareInterface::RunShare( DWORD_PTR dwPtr , int nType /*= 0*/ )
{
	Init();
	return 1;
}

FX_SHAREAPI void FXShareApiTest( DWORD_PTR dwPtr  )
{
	MessageBox(NULL,(LPCTSTR)"APITest Good--FXShareApiTest",(LPCTSTR)"FXShareApiTest",MB_OK);
}

FX_SHAREAPI void FXShareApi( DWORD_PTR dwPtr  )
{
	MessageBox(NULL,(LPCTSTR)"APITest Good--FXShareApi",(LPCTSTR)"FXShareApi",MB_OK);
}

FX_SHAREAPI ShareInterface* FXShareInterface( DWORD_PTR& dwPtr )
{
	ShareInterface* pShareInterface = new ShareInterface();
	if (pShareInterface){
		//dwPtr = (DWORD_PTR)pShareInterface;
		return pShareInterface;
	}
	return NULL;
}

FX_SHAREAPI int FXStart( DWORD_PTR dwPtr, int nType /*= 0*/ )
{
	MessageBox(NULL,(LPCTSTR)"FXStart",(LPCTSTR)"FXStart",MB_OK);
	return 1;
}

FX_SHAREAPI BOOL FXStop( DWORD_PTR dwPtr, LPARAM lparam,int nType /*= 0*/ )
{
	MessageBox(NULL,(LPCTSTR)"FXStop",(LPCTSTR)"FXStop",MB_OK);
	return TRUE;
}

//
//other cpp call the Interface in "ShareInterface"
//

#define _Dynamic_link
#define _Static_link

#ifdef _Static_link
#include "..\ShareDll\ShareInterface.h"
#pragma comment (lib , "..\\lib\\ShareDll.lib")
#endif

#ifdef _Dynamic_link

typedef void (*pfn_FXShareApiTest)( DWORD_PTR dwPtr  );
typedef void (*pfn_FXShareApi)(DWORD_PTR dwPtr);
typedef int  (*pfn_FXStart)(DWORD_PTR dwPtr, int nType);
typedef BOOL (*pfn_FXStop)(DWORD_PTR dwPtr, LPARAM lparam,int nType);
typedef ShareInterface* (*pfn_FXShareInterface)(DWORD_PTR& dwPtr);

//pfn_FXShareApiTest     FXShareApiTest =NULL;
//pfn_FXShareApi         FXShareApi =NULL;
//pfn_FXStart            FXStart =NULL;
//pfn_FXStop             FXStop =NULL;
//pfn_FXShareInterface   FXShareInterface =NULL;
pfn_FXShareInterface     pFXShareInterface =NULL;

#define GETAPI(func)\
	func = (pfn_##func)GetProcAddress(hlib,#func);

#endif


void CFileOperationDlg::ShareDllTestFnc()
{

#ifdef _Dynamic_link

typedef void (*Fn_ShareInterface)(DWORD_PTR dwPtr);
typedef ShareInterface* (*FX_Interface)(LPARAM dwPtr);


	char lpFile[MAX_PATH] = "\0";
	GetModuleFileName(NULL,lpFile,MAX_PATH);
	char* lpTemp = strrchr(lpFile,'\\');
	if (lpTemp){
		strcpy(lpTemp+1 ,"\0");
	}
	strcat(lpFile,"ShareDll.dll");
	if (_access(lpFile,0)){// mode 0: exist only
		//if the success with the mode,return 0;otherwise -1
		return;
	}
	HMODULE hlib =  LoadLibrary(lpFile);
	if (NULL == hlib ||
		INVALID_HANDLE_VALUE == hlib)
	{
		return;
	}
	if (hlib)
	{
		//GETAPI(FXShareApiTest)
		//GETAPI(FXShareApi)
		//GETAPI(FXStart)
		//GETAPI(FXStop)
                //GETAPI(FXShareInterface)

		Fn_ShareInterface ShareApiQ = (Fn_ShareInterface)GetProcAddress(hlib,"ShareApiTest");
		if (ShareApiQ){
			ShareApiQ(NULL);
		}
		Fn_ShareInterface ShareApiTest = (Fn_ShareInterface)GetProcAddress(hlib,"FXShareApiTest");
		if (ShareApiTest){
			ShareApiTest(NULL);
		}
		Fn_ShareInterface ShareApi = (Fn_ShareInterface)GetProcAddress(hlib,"FXShareApi");
		if (ShareApi){
			ShareApi(NULL);
		}
		FX_Interface FXShareInterface = (FX_Interface)GetProcAddress(hlib,"FXShareInterface");
		if (FXShareInterface){

			ShareInterface* pShareInterface = FXShareInterface(NULL);

			if (pShareInterface)
			{
				pShareInterface->Init();
				pShareInterface->RunShare(NULL);
			}

		}

	}

#endif//#ifdef _Dynamic_link

#ifdef _Static_link
	FXShareApiTest(NULL);
	FXShareApi();
#endif

}

/error LNK2019: 无法解析的外部符号 "public: void __thiscall ShareInterface::Init(void)" (?Init@ShareInterface@@QAEXXZ)，
//该符号在函数 "public: void __thiscall CFileOperationDlg::ShareDllTestFnc(void)" (?ShareDllTestFnc@CFileOperationDlg@@QAEXXZ) 中被引用
//class /*__declspec(dllexport)*/ ShareInterface