c++ - 为什么 SetWindowsHookEx 不接受钩子(Hook)程序？

Question

我正在尝试创建一个 dll，我可以用它来监视所有系统事件(进程创建、销毁等)。这是我到目前为止的想法:

DLL main - 我的 DLL 的入口点:

// dllmain.cpp : Defines the entry point for the DLL application.

#include "stdafx.h"
#include "CBTHook.h"
BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        CBT::CBTHook::SetHandle(hModule);
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

DLL头文件

//Dll header file - function signatures

#ifdef CBTHOOKDLL_EXPORTS
#define CBTHOOKDLL_API __declspec(dllexport) 
#else
#define CBTHOOKDLL_API __declspec(dllimport) 
#endif

namespace CBT
{
    class CBTHook
    {
    public:
        CBTHook();
        static void SetHandle(HINSTANCE handle);
        void InstallHook();
        void UnistallHook();
        LRESULT CALLBACK HookProcedure(int nCode, WPARAM wparam, LPARAM lparam);
        ~CBTHook();
        
    private:

        static HINSTANCE currentProcessHandle;
        HOOKPROC hkprcSysMsg;
        static HHOOK hookID;
    };

}

CBTHook.cpp

// CBTHook.cpp : Defines the exported functions for the DLL application.
//
#pragma once
#include "stdafx.h"
#include "CBTHook.h"
#include <Windows.h>
#include <iostream>

using namespace std;

namespace CBT
{
    CBTHook::CBTHook()
    {

    }

    void CBTHook::SetHandle(HINSTANCE handle)
    {
        currentProcessHandle = handle;
    }

    void CBTHook::InstallHook()
    {
        hookID = SetWindowsHookEx(WH_CBT,HookProcedure, currentProcessHandle, 0);
    }

    void CBTHook::UnistallHook()
    {
        UnhookWindowsHookEx(hookID);
    }

    LRESULT CALLBACK CBTHook::HookProcedure(int nCode, WPARAM wparam, LPARAM lparam)
    {
        if (nCode >= 0)
        {
            switch (nCode)
            {
            case HCBT_CREATEWND:
                cout << "Created!~" << endl;
                break;
            case HCBT_DESTROYWND:
                cout << "Destroied!~" << endl;
                break;
            default:
                cout << "sth else" << endl;
                break;
            }
        }
        else
            return CallNextHookEx(hookID, nCode, wparam, lparam);
    }
}

现在的问题是，SetWindowsHookEx 不会接受 HookProcedure，而据我在网上阅读和看到的，相关函数的返回值是正确的.我收到错误:

error C3867: 'CBT::CBTHook::HookProcedure': function call missing argument list; use '&CBT::CBTHook::HookProcedure' to create a pointer to member

照上面的方法也不能解决问题!

我在这里错过了什么？

Answer 1

您的 Hook 过程必须是自由函数或静态类方法。如果要调用类实例方法，则需要将该调用包装在上述方法之一中。

编辑:

要设置一个钩子(Hook)，你不需要类。这是一个基本的例子。其他所有问题都源于您对类(class)的使用。如果你想使用一个类，确保你知道如何去做。如果您不确定，C++ 不是 Java。您不需要使用一个类，如果它在没有的情况下也能完美运行。

例子:

#include "stdafx.h"

HHOOK hHook;

BOOL APIENTRY DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
{
    switch (dwReason)
    {
    case DLL_PROCESS_ATTACH:
        hHook = SetWindowsHookEx(WH_CBT, HookProcedure, hModule, 0);
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

LRESULT CALLBACK HookProcedure(int nCode, WPARAM wparam, LPARAM lparam)
{
    if (nCode >= 0)
    {
        switch (nCode)
        {
        case HCBT_CREATEWND:
            cout << "Created!~" << endl;
            break;
        case HCBT_DESTROYWND:
            cout << "Destroied!~" << endl;
            break;
        default:
            cout << "sth else" << endl;
            break;
        }
    }
    else
        return CallNextHookEx(hHook, nCode, wparam, lparam);
}