Qt Windows.h 后台按键监测

首先 pro：

LIBS +=User32.LIB


main.cpp：

#include "hooktest.h"

#include "ui_hooktest.h"

#include <QDebug>

LRESULT CALLBACK keyProc(int nCode, WPARAM wParam, LPARAM lParam);

HHOOK keyHook=NULL;

WPARAM lastkey=0;

QString lastStr;

int starthook();

HookTest::HookTest(QWidget *parent)

    : QWidget(parent)

    , ui(new Ui::HookTest)

{

    ui->setupUi(this);

        keyHook = SetWindowsHookEx(WH_KEYBOARD_LL, keyProc, GetModuleHandle(NULL), 0);

        MSG msg = { 0 };

        while (GetMessage(&msg, NULL, 0, 0)) {  //WM_QUIT消息 退出

        //将虚拟键消息转换为字符消息,虚拟键值                `

        //VK_UP,VK_DOWN

        TranslateMessage(&msg);

        //将消息分发给窗口处理函数

        DispatchMessage(&msg);

        }

}

HookTest::~HookTest()

{

    delete ui;

}

LRESULT CALLBACK keyProc(int nCode, WPARAM wParam, LPARAM lParam){

    PKBDLLHOOKSTRUCT key = (PKBDLLHOOKSTRUCT)lParam;

    qDebug()<<key->vkCode<<endl;

    return CallNextHookEx(keyHook, nCode, wParam, lParam);

}