c++ - GetProcAddress 无法获取 Void pascal Myfunction(BOOL) 形式的地址

Question

我有 MyDll.dll，我想访问其函数 Myfunction，其形式为:

Void pascal Myfunction(BOOL);

这是我的代码:

#include "stdafx.h"
#include "iostream"
#include "windows.h"
using namespace std;
void calldll();

extern "C" __declspec(dllexport) void Myfunction(BOOL);

void calldll()
{
    HINSTANCE hDll;
    DWORD dwErrorCode=0;
    LoadMe=LoadLibrary(_T("MyDll.dll"));


    if(hDll!=NULL)
    {
        cout<<"\n DLL loaded successfully \n";
    }

    else
        cout<<"\n Unable to load DLL \n";

    Myfunction sp1=(Myfunction)GetProcAddress(hDll,"Myfunction");


    if(sp1!=NULL)
    {
        cout<<"\n Process loaded successfully \n";
    }
    else
    {
              cout<<"\n Unable to load Process \n";

    }


    FreeLibrary(hDll);

}

报错如下:

1.syntax error : missing ';' before identifier 'sp1'

2.'sp1' : undeclared identifier

3.syntax error : missing ';' before identifier 'GetProcAddress'

我不明白。任何人都可以在这方面帮助我。

Answer 1

您需要声明一个变量，该变量是指向返回 void 并接受 BOOL 参数的函数的指针:

typedef void (pascal *MYFUNCTION_PTR)(BOOL);

MYFUNCTION_PTR fp = (MYFUNCTION_PTR)GetProcAddress(hDll,"Myfunction");

例如:

#include <stdafx.h>
#include <iostream>
#include <windows.h>

void calldll();

void calldll()
{
    typedef void (pascal *MYFUNCTION_PTR)(BOOL);
    HINSTANCE hDll;

    hDll = LoadLibrary(_T("MyDll.dll"));

    if(hDll!=NULL)
    {
        cout<<"\n DLL loaded successfully \n";

        MYFUNCTION_PTR sp1=(MYFUNCTION_PTR)GetProcAddress(hDll,"Myfunction");

        if(sp1!=NULL)
        {
            cout<<"\n Process loaded successfully \n";
        }
        else
        {
            cout<<"\n Unable to locate function: " << GetLastError() << \n";
        }

        FreeLibrary(hDll);
    }
    else
    {
        cout<<"\n Unable to load DLL \n";
    }

}