新人求助，想用多线程完成文件读取，但是遇到了错误一直没办法解决

#include <iostream>

#include <fstream>

#include <cstdlib>

#include <pthread.h>

#include <string.h>

#include <map>



using namespace std;



#define NUM_THREADS     5



void *countWordFrequency(void *str[100])

{

    //将void类型转换成string类型

    string s = (string)(char *)str;



    int count = 0, c = 0, i, j = 0, k, space = 0;

    char p[50][100], ptr1[50][100];



    for (i = 0;i< s.length();i++)

    {

        if ((s[i] == ' ')||(s[i] == ',')||(s[i] == '.'))

        {

            space++;

        }

    }

    for (i = 0, j = 0, k = 0;j < s.length();j++)

    {

        if ((s[j] == ' ')||(s[j] == 44)||(s[j] == 46))

        {

            p[i][k] = '\0';//把正在录入的设置成空格

            i++;

            k = 0;

        }

        else

            p[i][k++] = s[j]; //str[j] probably is the array which store the words

        //that are input into this vessel

        //i probably the number of the paticular word

        //j 是为了确认这个循环不超过单词的d总数量

    }

    k = 0; //

    for (i = 0;i <= space;i++)

    {

        for (j = 0;j <= space;j++)

        {

            if (i == j)

            {

                strcpy(ptr1[k], p[i]);//ptr1[k] is the pointer to the destination

                //array that the content is be copied.

                //p[i] is the string to be copied.

                //这个复制是复制一整个词而不是一个字母

                k++;

                count++;//i think the count is the number of the frequency words

                break;

            }

            else

            {

                if (strcmp(ptr1[j], p[i]) != 0)//strcmp is the comparing function

                    //! = 0 means that they are paired

                    //successively

                    continue;//then continue means that if it satify the

                //requirements then skip these sentence, restart the

                //sentence from the beginning.

                //so this continue means if ptr1 == p then step out

                //this circle and restart

                else

                    break;

            }

        }

    }

    for (i = 0;i < count;i++)

    {

        for (j = 0;j <= space;j++)

        {

            if (strcmp(ptr1[i], p[j]) == 0)

                c++;

        }

        printf("%s -> %d times\n", ptr1[i], c);//ptr1[i] is the place to store the

        //words of this code

        c = 0;

    }



    pthread_exit(NULL);



    return 0;

}



string readByLine()

{

    char buffer[256];

    fstream outFile;

    outFile.open("book.txt",ios::in);



    while(!outFile.eof())

    {

        outFile.getline(buffer,256,'\n');//getline(char *,int,char) 表示该行字符达到256个或遇到换行就结束

        cout<<buffer<<endl;

    }

    outFile.close();

    

    return 0;

}



int main ()

{

    pthread_t threads[NUM_THREADS];

    int indexes[NUM_THREADS];

    int rc;

    int i;

    

    //read file

    string r = readByLine();



    for( i=0; i < NUM_THREADS; i++ ){

        indexes[i] = i; //先保存i的值

        // 传入的时候必须强制转换为void* 类型，即无类型指针

        rc = pthread_create(&threads[i], NULL,

                            *countWordFrequency, (void *)&i);

        if (rc){

            cout << "Error: can create threads," << rc << endl;

            exit(-1);

        }

    }

    pthread_exit(NULL);

}