简易csv解析

游戏开发中少不了配置数据，csv格式既方便导出又方便使用，下面是简单csv解析（字段数据中不能含有分隔符),以后会继续完善，嘿嘿。

//
//  CCSVParse.hpp
//  CPPAlgorithm
//
//  Created by xujw on 16/2/26.
//  Copyright © 2016年 xujw. All rights reserved.
//

#ifndef CCSVParse_h
#define CCSVParse_h

#include <stdio.h>
#include <vector>
#include <string>
#include <iostream>

class CCSVParse
{
public:
    CCSVParse();
    ~CCSVParse();

    //解析出行列数据
    std::vector< std::vector<std::string> > parseCsvFile(const std::string &fileName,const std::string &separator = ",");

    //打印出解析的数据 测试用
    void printParseData() const;

    inline size_t getRowNum() const {return _gridData.size();};

    /*
        分隔字符串
        str:要分隔的字符串/文件
        seperator:分隔符
     */
    std::vector<std::string> splitString(const std::string &str,const std::string &sparator);

    std::string loadCsvFile(const std::string &fileName);

private:
    //原始数据
    std::vector< std::vector<std::string> > _gridData;
};

#endif /* CCSVParse_h */


//
//  CCSVParse.cpp
//  CPPAlgorithm
//
//  Created by xujw on 16/2/26.
//  Copyright © 2016年 xujw. All rights reserved.
//

#include "CCSVParse.h"

CCSVParse::CCSVParse(){}
CCSVParse::~CCSVParse(){}

std::vector<std::string> CCSVParse::splitString(const std::string &str, const std::string &separator)
{
    std::vector<std::string> resVec;
    if ("" == str)
    {
        return resVec;
    }
    //方便截取最后一段数据
    std::string dataStr = str + separator;

    size_t pos = dataStr.find(separator);
    size_t size = dataStr.size();

    while (pos != std::string::npos)
    {
        std::string x = dataStr.substr(0,pos);
        resVec.push_back(x);
        dataStr = dataStr.substr(pos+1,size);
        pos = dataStr.find(separator);
    }

    return resVec;
}

std::string CCSVParse::loadCsvFile(const std::string &fileName)
{
    FILE *pFile = fopen(fileName.c_str(), "rb");
    if (0 == pFile)
    {
        return "";
    }

    fseek(pFile, 0, SEEK_END);      //指针移动到文件结尾
    long len = ftell(pFile);        //获取文件大小

    char *pBuffer = new char[len+1];

    fseek(pFile, 0, SEEK_SET);      //指针移动到文件开头
    fread(pBuffer, 1, len, pFile);  //读取文件
    fclose(pFile);

    //等价于std::string s;s.assign(pBuffer,len);
    pBuffer[len] = 0;
    std::string strRead(pBuffer,len);

    delete [] pBuffer;

    return strRead;
}

std::vector<std::vector<std::string>> CCSVParse::parseCsvFile(const std::string &fileName,const std::string &separator)
{
    clock_t before = clock();

    _gridData.clear();

    std::string allDataStr = loadCsvFile(fileName);
    //分出行和字段
    std::vector<std::string> ret = splitString(allDataStr, "
");
    for (size_t i=0; i<ret.size(); i++)
    {
        std::vector<std::string> rowData = splitString(ret.at(i), separator);
        _gridData.push_back(rowData);
    }

    float used = (float)(clock()-before)/CLOCKS_PER_SEC;
    std::cout<<"解析此csv花费时间:"<<used<<"S"<<std::endl;

    return _gridData;
}

void CCSVParse::printParseData() const
{
    std::cout<<"以下是解析的csv数据:"<<std::endl;
    for (int row=0; row<_gridData.size(); row++)
    {
        std::vector<std::string> rowData = _gridData.at(row);
        for (int col = 0; col<rowData.size(); col++)
        {
            std::cout<<rowData.at(col)<<"	";
        }
        std::cout<<"
"<<std::endl;
    };
}