В чем причина ошибки при получении адреса функции из dll с помощью функции GetProcAddress?

#include<windows.h>
HHOOK _hook;
int code;
bool key;
UINT scancode;
WPARAM wPararam;
LRESULT CALLBACK KeyProc(int ncode,WPARAM wParam,LPARAM lParam){
    KBDLLHOOKSTRUCT * pStruct = (KBDLLHOOKSTRUCT *)lParam;
    code=pStruct->vkCode;scancode=pStruct->scanCode;
    wPararam=wParam;
    if(wParam==WM_KEYUP){key=false;code=0;}else{key=true;}
    return CallNextHookEx(_hook,ncode,wParam,lParam);
}

#include<windows.h>
#include<iostream>
#include"hook.h"
using namespace std;
int main(){
int (*func)();
FUNC func;
MSG msg;
HINSTANCE hinstDLL;
hinstDLL=LoadLibrary("dll.dll");
 (FARPROC &)func=GetProcAddress(hinstDLL,"KeyProc");
_hook = SetWindowsHookEx(WH_KEYBOARD,0,hinstDLL,func);
while(1){
PeekMessage(&msg,NULL,0,0,0);   
}
    }

#include<windows.h>
#include<iostream>
 
extern "C" {
 
HHOOK _hook;
__declspec(dllexport) LRESULT CALLBACK KeyProc(int ncode,WPARAM wParam,LPARAM lParam){
    std::cout<<"123";
    return CallNextHookEx(_hook,ncode,wParam,lParam);
}
 
}

#include<windows.h>
#include<iostream>
using namespace std;
int main(){
    HHOOK _hook;
    int ncode;
    WPARAM wParam;
    LPARAM lParam;
MSG msg;
HINSTANCE hinstDLL=LoadLibrary("dll.dll");
 HOOKPROC func=(HOOKPROC)GetProcAddress(hinstDLL,"KeyProc@12");
 if (!func) {
        cout << "GetProcAddress failed, last error: " << GetLastError() << endl;
    }
cout<<func;
_hook = SetWindowsHookEx(WH_KEYBOARD,func,hinstDLL,0);
while(1){
GetMessage(&msg,NULL,0,0);
}
    }