Wie verwenden von timer in C?

Können Sie eine time_t struct und Uhr() Funktion von Zeit.h.

Speicherung der start-Zeit in einem time_t struct mithilfe clock() und überprüfen Sie die verstrichene Zeit durch einen Vergleich der Differenz zwischen der gespeicherten Zeit und der aktuellen Zeit.

InformationsquelleAutor Qutus

Können diese Beispiele helfen Ihnen

#include <stdio.h>
#include <time.h>
#include <stdlib.h>


/*
    Implementation simple timeout

    Input: count milliseconds as number

    Usage:
        setTimeout(1000) - timeout on 1 second
        setTimeout(10100) - timeout on 10 seconds and 100 milliseconds
 */
void setTimeout(int milliseconds)
{
    //If milliseconds is less or equal to 0
    //will be simple return from function without throw error
    if (milliseconds <= 0) {
        fprintf(stderr, "Count milliseconds for timeout is less or equal to 0\n");
        return;
    }

    //a current time of milliseconds
    int milliseconds_since = clock() * 1000 / CLOCKS_PER_SEC;

    //needed count milliseconds of return from this timeout
    int end = milliseconds_since + milliseconds;

    //wait while until needed time comes
    do {
        milliseconds_since = clock() * 1000 / CLOCKS_PER_SEC;
    } while (milliseconds_since <= end);
}


int main()
{

    //input from user for time of delay in seconds
    int delay;
    printf("Enter delay: ");
    scanf("%d", &delay);

    //counter downtime for run a rocket while the delay with more 0
    do {
        //erase the previous line and display remain of the delay
        printf("\033[ATime left for run rocket: %d\n", delay);

        //a timeout for display
        setTimeout(1000);

        //decrease the delay to 1
        delay--;

    } while (delay >= 0);

    //a string for display rocket
    char rocket[3] = "-->";

    //a string for display all trace of the rocket and the rocket itself
    char *rocket_trace = (char *) malloc(100 * sizeof(char));

    //display trace of the rocket from a start to the end
    int i;
    char passed_way[100] = "";
    for (i = 0; i <= 50; i++) {
        setTimeout(25);
        sprintf(rocket_trace, "%s%s", passed_way, rocket);
        passed_way[i] = ' ';
        printf("\033[A");
        printf("| %s\n", rocket_trace);
    }

    //erase a line and write a new line
    printf("\033[A");
    printf("\033[2K");
    puts("Good luck!");

    return 0;
}

Datei kompilieren, ausführen und löschen nach (meine Präferenz)

$ gcc timeout.c -o timeout && ./timeout && rm timeout

Versuchen, führen Sie es für sich selbst, um das Ergebnis sehen.

Hinweise:

Testumgebung

$ uname -a
Linux wlysenko-Aspire 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
$ gcc --version
gcc (Ubuntu 4.8.5-2ubuntu1~14.04.1) 4.8.5
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

InformationsquelleAutor Seti Volkylany