windows 键盘全局钩子

// HookapiTest.cpp : 定义控制台应用程序的入口点。
//

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

using namespace std;

HHOOK keyboardHook = 0;

LRESULT CALLBACK HookCallback(int code, WPARAM wParam, LPARAM lParam)
{
    KBDLLHOOKSTRUCT *ks = (KBDLLHOOKSTRUCT*)lParam;
    if(ks->vkCode == 'A')
    {
        cout << "A键拦截了！" << endl;
        return 1;
    }
    return CallNextHookEx(0, code, wParam, lParam);
}

int main()
{
    keyboardHook = SetWindowsHookExA(WH_KEYBOARD_LL, HookCallback, GetModuleHandleA(0), 0);

    if (keyboardHook == 0)
    {
        cout << "键盘钩子挂失败了！" << endl;
        return -1;
    }

    cout << "钩子挂好了！" << endl;


    MSG msg;

    while(1)
    {
        if (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessageW(&msg);
        }
        else
            Sleep(0);    //避免CPU全负载运行
    }

    UnhookWindowsHookEx(keyboardHook);

    cout << "正常结束！" << endl;

    return 0;
}