c++ - 捕捉屏保事件

Question

我正在尝试捕捉屏幕保护程序事件。这是我的代码:

#include "stdafx.h"
#include <iostream>
#include "stdio.h"

#include <Windows.h>


HHOOK _hook;

LRESULT CALLBACK HookCallback(int nCode, WPARAM wParam, LPARAM lParam)
{
    if (nCode >= 0)
    {


        LPMSG msg = (LPMSG)lParam;

        if(msg->message == WM_SYSCOMMAND)
        {
            if (msg->wParam == SC_SCREENSAVE)
            {
                std::cout<<"SC_SCREENSAVE\n";
            }
        }

    }

    return CallNextHookEx(_hook, nCode, wParam, lParam);
}

void SetHook()
{

    if (!(_hook = SetWindowsHookEx(WH_GETMESSAGE, HookCallback,NULL , 0)))
    {
        std::cout<<"Failed to install hook!\n";
    }
}

void ReleaseHook()
{
    UnhookWindowsHookEx(_hook);
}


int _tmain(int argc, _TCHAR* argv[])
{

    SetHook();

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {

    }

    ReleaseHook();

    return 0;
}

函数 SetWindowsHookEx(WH_GETMESSAGE, HookCallback,NULL , 0) 失败。它返回代码:

error 1428: Cannot set nonlocal hook without a module handle

.我做错了什么？谢谢!

Answer 1

系统范围的 Hook 要求应用程序具有更高的访问权限。您需要以管理员身份运行代码。

也许您会对this感兴趣问题/答案。