I have defined several macros, but one cannot be recognized. May I ask where the problem lies
Here are the codes for two files
I am a newcomer to C++, and I copied the macros from elsewhere
Writing someone else’s source code like this did not result in any errors, I copied it completely from their project

d2ptrs.h:

    #pragma once
#include "D2struct.h"
#include "MemHelper.h"

#ifdef _DEFINE_PTRS
#define FUNCPTR(dll, name, callingret, args, ...) 
    static Offsets f##dll##_##name##_offsets = { __VA_ARGS__ }; 
    __declspec(naked) callingret dll##_##name##args 
    { 
        static DWORD f##dll##_##name = NULL; 
        if(f##dll##_##name == NULL) 
        { 
        __asm { pushad } 
        f##dll##_##name = MemHelper::GetDllOffset(dll, *(&f##dll##_##name##_offsets._111b)); 
        __asm { popad } 
        } 
        __asm jmp [f##dll##_##name] 
    }


#define VARPTR(dll, name, type, ...) 
    type** Var_##dll##_##name##(VOID) 
    { 
        static DWORD f##Var_##dll##_##name = NULL; 
        if(f##Var_##dll##_##name## == NULL) 
        { 
        static Offsets f##Var_##_##name##_offsets = { __VA_ARGS__ }; 
        static int address = *(&f##Var_##_##name##_offsets._111b); 
        f##Var_##dll##_##name## = MemHelper::GetDllOffset(dll, address); 
        } 
        return (type**)&##f##Var_##dll##_##name; 
    } 
#else
...
#endif

FUNCPTR(D2CLIENT, PrintGameString, void __stdcall, (wchar_t* wMessage, int nColor), 0x16780)
FUNCPTR(D2CLIENT, GetPlayerXOffest, int __stdcall, (), 0x1BBE0)
FUNCPTR(D2CLIENT, GetPlayerYOffset, int __stdcall, (), 0x1BBF0)

VARPTR(D2CLIENT, MouseX, DWORD, 0x11B828)
VARPTR(D2CLIENT, MouseY, DWORD, 0x11B824)

#undef FUNCPTR
#undef ASMPTR
#undef VARPTR

dllmain.cpp:

    #define _DEFINE_PTRS
#include <sstream>
#include <thread>
#include "d2ptrs.h"

void OutputDebugMsg() {

    int xpos = D2CLIENT_GetPlayerXOffest();
    int ypos = D2CLIENT_GetPlayerYOffset();

    wchar_t message[256];
    std::wstringstream wss;
    wss << L",x:"<<xpos<<L"y:"<<ypos;
    std::wstring msg = wss.str();
    wcscpy_s(message, msg.c_str());
    D2CLIENT_PrintGameString(message, 0);

    int mX = (*p_D2CLIENT_MouseX); //problem:Undefined identifier 'p_D2CLIENT_MouseX'

}

void StartUp() {
    OutputDebugStringA("start");
    
    std::thread t(OutputDebugMsg);
    t.detach();
}


BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
    switch (ul_reason_for_call) {
    case DLL_PROCESS_ATTACH:
        StartUp();
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}