通过结构数组在第二次迭代中获取怪异的字符

Question

输入到数组中的值是threadRun()也应打印的正确值。由于某种原因，我在第二个循环中使用threadID（tid）和startTime / lifeTime获得了奇怪的字符，这与我放入数组的内容不一致。

int readFile(char *fileName, Thread **threads) //use this method in a suitable way to read file
{
    FILE *in = fopen(fileName, "r");

    if (!in) {
        printf("Child A: Error in opening input file...exiting with error code -1\n");
        return -1;
    }

    struct stat st;
    fstat(fileno(in), &st);
    char *fileContent = (char *)malloc(((int)st.st_size + 1) * sizeof(char));
    fileContent[0] = '\0';  

    while (!feof(in)) {
        char line[100];
        if (fgets(line, 100, in) != NULL) {
            strncat(fileContent, line, strlen(line));
        }
    }
    fclose(in);

    char *command = NULL;
    int threadCount = 0;
    char *fileCopy = (char *)malloc((strlen(fileContent) + 1) * sizeof(char));
    strcpy(fileCopy, fileContent);
    command = strtok(fileCopy, "\r\n");
    while (command != NULL) {
        threadCount++;
        command = strtok(NULL,"\r\n");
    }
    *threads = (Thread *)malloc(sizeof(Thread) * threadCount);

    char *lines[threadCount];
    command = NULL;
    int i = 0;
    command = strtok(fileContent, "\r\n");
    while (command != NULL) {
        lines[i] = malloc(sizeof(command) * sizeof(char));
        strcpy(lines[i],command);
        i++;
        command = strtok(NULL,"\r\n");
    }

    for (int k = 0; k < threadCount; k++) {
        char *token = NULL;
        int j = 0;
        token = strtok(lines[k], ";");

        while (token != NULL) {
            //this loop tokenizes each line of input file
            //write your code here to populate instances of Thread to build a collection
            if (j == 0) {
                printf("id of thread: %s\n", token);
                strcpy((*threads)[k].tid, token);
                token = strtok(NULL, ";");
                j++;
            } else
            if (j == 1) {
                printf("startTime of thread %s: %s\n", (*threads)[k].tid, token);
                (*threads)[k].startTime = atoi(token);
                token = strtok(NULL, ";");
                j++;
            } else
            if (j == 2) {
                printf("lifeTime of thread %s: %d\n\n", (*threads)[k].tid, atoi(token));
                (*threads)[k].lifeTime = atoi(token);
                token = strtok(NULL, ";");
                j++;
                token = strtok(NULL, ";");
            } else
            if (j == 3) {
                j = 0;
            }
        }
    }
    return threadCount;
}

readfile()-接收threads“;”的txt文件以信息定界：iD;startTime;lifeTime。输入此信息以创建一个结构线程数组，并返回那里的线程数（相当于行数）

typedef struct thread { //represents a single thread
    char tid[5];//id of the thread as read from file
    int startTime;
    int lifeTime;
} Thread;

int main(int argc, char *argv[]) {

    Thread **threads = (Thread**)malloc(sizeof(Thread*));

    int threadCount = readFile(argv[1], threads); //returns number of threads and populates list
    int i = 0;
    startClock();
    while (i < threadCount) {  //run for ea. thread
        sleep((*threads)[i].startTime);
        getCurrentTime();

        //=============FIX OUTPUT BELOW===================
        pthread_t activeThread;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_create(&activeThread, &attr, threadRun, threads[i]);
        pthread_join(activeThread, NULL);

        i++;
    }
    return 0;
}

void *threadRun(void *t) {  //implement this function in a suitable way
    Thread *currThread = (Thread *)t;
    int life;
    int start;
    start = currThread->startTime;
    life = currThread->lifeTime;

    logStart(currThread->tid);
    printf("startTime: %d\n", currThread->startTime);
    printf("lifetime: %d\n", currThread->lifeTime);
    printf("tid: %s\n", currThread->tid);
    logFinish(currThread->tid);
    pthread_exit(0);    
}

The values are inputted to the array "threads" and printed. Below that are the print statements from threadRun()

Answer 1

原来问题出在我的读取文件fnc中，我为数组中的第一个结构分配了内存空间，但没有为其他结构分配内存！