[笔记]linux C/C++ 获取精确时间方法

1.linux获取带毫秒的时间

#include <time.h>
#include <sys/time.h>
//调用函数时候可以传入字符串进行区别和标记
void sysUsecTime(const char *a)
{
    struct timeval tv;
    struct timezone tz;
    struct tm *p;
    gettimeofday(&tv, &tz);
    p = localtime(&tv.tv_sec);
    os_printf("%s:%04d-%02d-%02d-%02d-%02d-%02d-%06ld\n",a,1900+p->tm_year, 1+p->tm_mon, p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec, tv.tv_usec);
}

运行结果

 

2.win32和linux获取带毫秒的时间来计算时间差

#include <time.h>
#ifndef WIN32
 #include <sys/time.h>
#endif

double time_get()
{
    time_t time_sec;
    double nowtime=0;
    time_sec = time(NULL);
#ifdef WIN32
    struct	timeb	tp;
    ftime(&tp);
    nowtime=time_