前言

底层hook（钩子）相关逻辑；包含键位和各种组合键的捕获方法，及与Qt类进行交互的逻辑，特此记录

代码

源文件：

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#include <windows.h>
#include <stdint.h>

HHOOK keyHook= nullptr;

//keyboard hook
LRESULT CALLBACK keyProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *) lParam;

    if(nCode == HC_ACTION)
    {
        if(pkbhs->vkCode == VK_ESCAPE && GetAsyncKeyState(VK_CONTROL)& 0x8000 && GetAsyncKeyState(VK_SHIFT)&0x8000) //"Ctrl+Shift+Esc"
        {
            return 1;
        }
        else if(pkbhs->vkCode == VK_ESCAPE && GetAsyncKeyState(VK_CONTROL) & 0x8000)  //"Ctrl+Esc"
        {
            return 1;
        }
        else if(pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN )    //"Alt+Tab"
        {
            return 1;
        }
        else if(pkbhs->vkCode == VK_ESCAPE && pkbhs->flags &LLKHF_ALTDOWN)  //"Alt+Esc"
        {
            return 1;
        }
        else if(pkbhs->vkCode == VK_F4 && pkbhs->flags & LLKHF_ALTDOWN)  //"Alt+F4"
        {
            return 1;
        }
        else if(wParam == WM_KEYDOWN && pkbhs->vkCode == VK_SNAPSHOT)  //"Prtic"
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYUP && pkbhs->vkCode == VK_SNAPSHOT)
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYDOWN && pkbhs->vkCode == VK_LWIN)  // "LeftWin"
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYUP && pkbhs->vkCode == VK_LWIN)
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYDOWN && pkbhs->vkCode == VK_RWIN)  //"RightWin"
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYUP && pkbhs->vkCode == VK_RWIN)
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYDOWN && pkbhs->vkCode == VK_TAB)  //"TAB"
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYUP && pkbhs->vkCode == VK_TAB)
        {
            MainWindow::getInstance()->todo();
            return 1;
        }
        else if(wParam == WM_KEYDOWN && pkbhs->vkCode == 68)    //"Win+D"
        {
            if(GetKeyState(VK_LWIN))
            {
                MainWindow::getInstance()->todo();
                return 1;
            }
        }
    }
    return CallNextHookEx(keyHook, nCode, wParam, lParam);
}

void hook(bool flag)
{
    if(flag)
    {
        //registered hooks
        keyHook = SetWindowsHookEx(WH_KEYBOARD_LL,keyProc,GetModuleHandle(nullptr),0);
    }
    else
    {
        UnhookWindowsHookEx(keyHook);
        keyHook= nullptr;
    }
}


MainWindow* instance;
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    instance = this;
    hook(true);
}

MainWindow::~MainWindow()
{
    hook(false);
    delete ui;
}

MainWindow *MainWindow::getInstance()
{
    return instance;
}