为什么SetWindowsHookEx不接受挂钩过程? [英] Why doesn't SetWindowsHookEx accept the hook procedure?

问题描述

我正在尝试创建一个dll，用于监视所有系统事件(进程创建，破坏等).到目前为止，这是我提出的内容:

I am trying to create a dll where I can use to monitor all of system events (process creation, destruction, etc). This is what I have come up so far:

DLL main -我的DLL的入口点:

DLL main - the entry point of my DLL:

// 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，而据我在网上所读并看过的，该函数的返回值是正确的.我收到错误消息:

Now the problem is that, SetWindowsHookEx wont accept the HookProcedure while as far as I have read and seen on the net the return value of the function in question is correct. I get the error:

错误C3867:'CBT :: CBTHook :: HookProcedure':函数调用缺少参数列表；使用'& CBT :: CBTHook :: HookProcedure'创建指向成员的指针

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

按照上述建议进行操作也不能解决问题！

Doing as suggested by above doesn't solve the problem either!

我在这里想念什么?

推荐答案

您的挂钩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.

Your hook procedure must be a free function or a static class method. If you want to call a class instance method, you need to wrap that call in one of the above.

要设置一个钩子，不需要任何类.这是一个基本的例子.其他所有问题均源于您对类的使用.如果要使用课程，请确保您知道该怎么做.如果不确定，C ++不是Java.如果不需要，类就不需要使用.

To set a hook you need no classes. This is a basic example. Every other problem stems from your use of a class. If you want to use a class, make sure you know how to do it. If you are unsure, C++ is not Java. You don't need to use a class if it works just perfectly without.

示例:

#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);
}

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