c - C 中的结构问题

Question

我的结构中有一个数组。我正在从文件读入字符串。我使用 strtok 获取前几个字符，并且我想将行的其余部分传递到结构中，最终传递到线程中。我收到以下错误:

从类型 char * 分配给类型 char[1024] 时，类型不兼容

引用下面的注释行。这可能与我尝试复制字符数组的方式有关，但我不确定更好的方法。

#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <linux/input.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

typedef struct 
{
    int period; //stores the total period of the thread
    int priority; // stores the priority
    char pline[1024]; // stores entire line of text to be sorted in function. 
}PeriodicThreadContents;  

int main(int argc, char* argv[])
{
    //opening file, and testing for success
    //file must be in test folder
    FILE *fp;
    fp = fopen("../test/Input.txt", "r");

    if (fp == NULL) 
    {
        fprintf(stderr, "Can't open input file in.list!\n");
        exit(1);
    }

    char line[1024];

    fgets(line, sizeof(line), fp);

    //getting first line of text, containing    
    char *task_count_read = strtok(line," /n");
    char *duration_read = strtok(NULL, " /n");

    //converting char's to integers
    int task_count = atoi(task_count_read);

    int i = 0;

    PeriodicThreadContents  pcontents;




    printf("started threads \n");

    while  (i < task_count)
    {
        fgets(line, sizeof (line), fp);
        strtok(line," ");   

        if (line[0] == 'P')
        {
            char *period_read = strtok(NULL, " ");
            pcontents.period = atoi(period_read);           
            printf("%d",pcontents.period);
            printf("\n");

            char *priority_read = strtok(NULL, " ");
            pcontents.priority = atoi(priority_read);   
            printf("%d",pcontents.priority);
            printf("\n");

            printf("\n%s",line);
            memcpy(&(pcontents.pline[0]),&line,1024);
            printf("%s",pcontents.pline);
        }

    }


    return 0;   
}

Answer 1

C 无法像其他语言那样处理字符串。如果不使用辅助函数，C 就没有字符串赋值或比较。

为了复制缓冲区中的字符串，您可以使用:

strcpy(pcontents.pline, line);

甚至(保证您的字符串不超过 1024 字节):

memcpy(pcontents.pline, line, 1024);
pcontents.pline[1023] = '\0';

对于其他字符串操作，请检查:http://www.gnu.org/software/libc/manual/html_node/String-and-Array-Utilities.html#String-and-Array-Utilities