我對C編程比較陌生,而且我正在開展一個需要非常準確的項目;因此我嘗試寫一些東西來創建一個毫秒精度的時間戳.

它似乎有效但我的問題是這種方式是否正確,還是有更簡單的方法？這是我的代碼：

#include

#include

void wait(int milliseconds)

{

clock_t start = clock();

while(1) if(clock() - start >= milliseconds) break;

}

int main()

{

time_t now;

clock_t milli;

int waitMillSec = 2800, seconds, milliseconds = 0;

struct tm * ptm;

now = time(NULL);

ptm = gmtime ( &now );

printf("time before: %d:%d:%d:%d\n",ptm->tm_hour,ptm->tm_min,ptm->tm_sec, milliseconds );

/* wait until next full second */

while(now == time(NULL));

milli = clock();

/* DO SOMETHING HERE */

/* for testing wait a user define period */

wait(waitMillSec);

milli = clock() - milli;

/*create timestamp with milliseconds precision */

seconds = milli/CLOCKS_PER_SEC;

milliseconds = milli%CLOCKS_PER_SEC;

now = now + seconds;

ptm = gmtime( &now );

printf("time after: %d:%d:%d:%d\n",ptm->tm_hour,ptm->tm_min,ptm->tm_sec, milliseconds );

return 0;

}

總結

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