c＋＋文件读写

其data0.txt的数据是这样的

0,00,000,5,s
0,00,001,6,s
0,00,002,9,s
0,00,003,7,s
0,00,004,5,s
0,00,005,11,s
0,00,006,3,s
0,00,007,3,s
0,00,008,7,s
0,00,009,15,s
0,01,000,1,s
0,01,001,3,s
0,01,002,2,s
0,01,003,7,s
0,01,004,9,s
0,01,005,8,s
0,01,006,6,s
0,01,007,4,s
0,01,008,14,s

//
//  main.cpp
//  文件读写
//
//  Created by zhoujl on 15/9/11.
//  Copyright (c) 2015年 zhoujl. All rights reserved.
//

#include <iostream>
#include <fstream>
#include <vector>
#include <cstdio>
struct Data {
    int a;
    int b;
    int c;
    int d;
    char e;
};
std::vector<Data> data1;        //用vector存储文件读出来的数据
／／对文件里的整数字符串转化为整型数
int stringToNum(std::string a) { 
    size_t len = a.length();
    int num = 0;
    for (size_t i = 0; i < len; i++) {
        num = num*10 + a[i] - '0';
    }
    return num;
}
bool readFromFile() {
    const char* rtfFileName = "data0.txt";
    std::ifstream fp(rtfFileName);
    std::string data_buf;
    Data da;
    char s = ',';          //文件里以逗号为分隔符
    int w[5] = {1,2,3,1,1}; //数据的字符个数
    if (!fp.is_open()) {
        return false;
    }
    while (fp.peek() !=EOF) {
        data_buf.clear();
        getline(fp, data_buf);
        std::cout << data_buf <<std::endl;
        int count = 1;
        int pos = 1;     //读取字符串位置终点
        int startpos = 0; //读取字符串位置起点
        std::string rtf_buf;
        while (count <= 5) {
            std::string stringbuf = data_buf;
            rtf_buf = stringbuf.substr(startpos,pos - startpos);
            std::cout << rtf_buf <<std::endl;
            if (count == 1) {
                da.a = stringToNum(rtf_buf);
                count++;
            } else if (count == 2) {
                da.b = stringToNum(rtf_buf);
                    count++;
            } else if (count == 3) {
                da.c = stringToNum(rtf_buf);
                count++;
            } else if (count == 4) {
                da.d = stringToNum(rtf_buf);
                count++;
            } else {
                da.e = rtf_buf[0];
                count++;
            }
            startpos = pos+1;
            pos = startpos + w[count-1];
            //由于第4个数据可能两个字符也有可能1个字符，需对终点重新计算
            if (count == 4) {
                for (unsigned int i = pos; i < data_buf.length(); i++) {
                    if (data_buf[i] == s) {
                        pos = i;
                        break;
                    }
                }
            }
        }
        data1.push_back(da);
    }
    return true;
}
int main(int argc, const char * argv[]) {
    // insert code here...
    if (readFromFile()) {
        printf("hh\n");
    } else {
        printf("55\n");
    }
    return 0;
}