c++ - 无法捕获屏幕保护程序事件

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>

#include <strsafe.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()
{
    HINSTANCE hinstDLL = LoadLibrary(L"user32.dll");
    if (!(_hook = SetWindowsHookEx(WH_GETMESSAGE,HookCallback,hinstDLL,0)))
    {
        std::cout<<"Failed to install hook!\n";
    }
}

void ReleaseHook()
{
    UnhookWindowsHookEx(_hook);
}


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

    SetHook();


    // Don't mind this, it is a meaningless loop to keep a console application running.
    // I used this to test the keyboard hook functionality. If you want to test it, keep it in ;)
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {

    }
    ReleaseHook();
    return 0;
}

注册成功。但我没有 catch 这个事件。甚至没有进入回调函数。我做错了什么？

Answer 1

您是否正在尝试创建屏幕保护程序或程序来截取桌面？如果您正在制作屏幕保护程序，请遵循这些。

屏幕保护程序是具有 .scr 扩展名的普通程序。屏幕保护程序应接受以下命令行参数。

• \S - Run in the full-screen mode
• \P - Run in the preview dialog box
• \C - Show the configuration dialog

但是 \P 开关有点不同。它后面是一个冒号和系统对话框的窗口句柄。例如，它可以是 /P:1234567890