C++读系统时间，且读出毫秒的方法[VC和GCC]

#include <iostream>
#ifdef WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif

using std::cout;
using std::endl;

long GetMillisecond()
{
    long    lMillisecond = 0L;
#ifdef WIN32
    SYSTEMTIME    st;     // System time structure
    GetSystemTime(&st);     // Get system time
    lMillisecond = st.wMilliseconds;     // Get millisecond
#else
    struct timeval tv;
    gettimeofday(&tv, NULL);     // NULL is only legal value
    lMillisecond = tv.tv_usec / 1000;     // Get Millisecond;
#endif

    return lMillisecond;
}

int main()
{
    int i = 0;     // Counter
    cout<<"Get Millisecond Example by JJ."<<endl;
    cout<<"----------------------------"<<endl;

    for (i = 0; i < 20; ++i)
    {
        cout<<GetMillisecond()<<endl;
        Sleep(100);
    }
    cout<<"----------------------------\nDone!"<<endl;
    return 0;
}