alarm.cpp

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
#include <unistd.h>

#ifdef __MINGW32__
#include <windows.h>
#include <mmsystem.h>   // need to link libwinmm.a
#endif

using namespace std;

class Alarm {

    static const char bell = 7;
    unsigned hh, mm, ss;
    unsigned ah = 25, am = 0, as = 0;   // 默认不响
    int alertCount = 0;                 // 还需要响几下

public:
    int alertLength = 10000;            // 闹铃长度

    void setAlarm(unsigned h, unsigned m, unsigned s)
    {
        ah = h;
        am = m;
        as = s;
    }

    void print() const  // const 方法不修改成员变量
    {
        cout << '\r'                    // 清除当前行
             << setw(2) << hh << ':'
             << setw(2) << mm << ':'
             << setw(2) << ss << flush;
    }

    void update(time_t cur_sec)
    {
        hh = (cur_sec / 3600 + 8) % 24;
        mm = cur_sec / 60 % 60;
        ss = cur_sec % 60;
    }

    void run()
    {
        time_t last_sec = time(NULL);   // 获取系统时间
        cout << setfill('0');           // 在 cout 的数字前补 0
        while (true) {
            usleep(2000);               // 休息 2000 μs
#ifdef __MINGW32__
            if (alertCount > 0) {
                PlaySound("Alarm07.wav", NULL, SND_FILENAME | SND_ASYNC);
                alertCount = 0;
            }
#else
            if (alertCount > 0) {
                cout << bell << flush;
                --alertCount;
            }
#endif
            time_t cur_sec = time(NULL);
            if (cur_sec != last_sec) {
                update(cur_sec);
                print();
                last_sec = cur_sec;
                if (ah == hh && am == mm && as == ss) {
                    alertCount = alertLength;
                }
            }
        }
    }
};

int main(int argc, char **argv)
{
    Alarm a;
    if (argc > 3) {
        a.setAlarm(
            atoi(argv[1]),
            atoi(argv[2]),
            atoi(argv[3])
        );
    }
    a.run();
    return 0;
}