编译没有问题 就是调用函数的时候
老是说这  没有发现函数
应该是函数调用失败了

文件一
#include <windows.h>
#include <stdio.h>


int WINAPI WinMain (HINSTANCE hInstance, 
                    HINSTANCE hPrevInstance,
                    PSTR szCmdLine, 
                    int iCmdShow)
{
    HMODULE dll_handle;
    HWND    win_handle;
    char win_name[64] = {0};
    char dll_name[] = "d_99.dll";
    char fil_name[] = "address.txt";
    char fon_name[] = "sethook";
    FILE *file_p;
    int idHook = WH_GETMESSAGE;
    unsigned long ThreadId;
    HHOOK hook;
    int n = 0;

    file_p = fopen(fil_name,"rb");
    if(!file_p){MessageBox (NULL,TEXT ("没有发现地址文件"),TEXT ("警告"),0);return(0);}
    for(;;)
    {   if(!fread(win_name,1,1,file_p)){break;}
        if(win_name[0] == 47 || win_name[0] == 13){break;}
        n++;
    }
    if(n >= 63){MessageBox (NULL,TEXT ("标题太长"),TEXT ("警告"),0);return(0);}
    if(n == 0){MessageBox (NULL,TEXT ("文件错误"),TEXT ("警告"),0);return(0);}
    fseek(file_p,0,0); 
    fread (win_name,n,1,file_p);
    MessageBox (NULL,win_name,TEXT ("警告"),0);
    fclose (file_p);
    dll_handle = LoadLibrary (dll_name);
    if(!dll_handle){MessageBox (NULL,TEXT ("没有发现DLL"),TEXT ("警告"),0);return(0);}
    win_handle = FindWindow (NULL,win_name);
    if(!win_handle){MessageBox (NULL,TEXT ("没有发现窗口"),TEXT ("警告"),0);return(0);}
    ThreadId = GetWindowThreadProcessId(win_handle,NULL);

    typedef long (__stdcall *LPFNREGISTER)(int nCode, WPARAM wParam, LPARAM lParam);   
    LPFNREGISTER lpfnRegister;   
    lpfnRegister = (LPFNREGISTER)GetProcAddress(dll_handle,fon_name);   
    if(!lpfnRegister){MessageBox (NULL,TEXT ("没有发现函数"),TEXT ("警告"),0);return(0);}


/*
    hook = SetWindowsHookEx(idHook,                                                                // 钩子类型    
                            lpfnRegister,                                                          // 钩子函数    
                            dll_handle,                                                            // DLL句柄    
                            ThreadId);                                                             // 线程ID    
    UnhookWindowsHookEx(hook);

*/

    FreeLibrary(dll_handle);
    return(0);
}


文件2
#include "d_resource.h"

int WINAPI DllMain (HINSTANCE hInstance, 
                    DWORD fdwReason, 
                    PVOID pvReserved)
{
    
    return TRUE ;
}

EXPORT long __stdcall sethook(int nCode, WPARAM wParam, LPARAM lParam)
{
    MessageBox (NULL,TEXT ("函数检测"),TEXT ("警告"),0);
    return(0);
}

文件3《d_resource.h》

#include <windows.h>
#ifdef __cplusplus
#define EXPORT extern "C" __declspec (dllexport)
#else
#define EXPORT __declspec (dllexport)
#endif
EXPORT long __stdcall sethook(int nCode, WPARAM wParam, LPARAM lParam);