代码如下：
/********************************************************Copyright (C), 2016-2018,FileName: mainAuthor: woniu201Created: 2018/08/31Description: 文件操作：读取指定行，删除指定行，修改指定行********************************************************/#include <iostream>#include <fstream>#include <string>using namespace std;/************************************@ Brief: 读取指定行数据@ Author: woniu201 @ Created: 2018/08/31@ Return: ************************************/void ReadLineData(char* fileName, int lineNum, char* data){ ifstream in; in.open(fileName); int line = 1; while (in.getline(data, 1024)) { if (lineNum == line) { break; } line ++ ; } in.close();}/************************************@ Brief: 字符串转string类型@ Author: woniu201 @ Created: 2018/08/31@ Return: ************************************/string CharToStr(char * contentChar){ string tempStr; for (int i=0;contentChar[i]!='\0';i++) { tempStr+=contentChar[i]; } return tempStr;}/************************************@ Brief: 删除指定行@ Author: woniu201 @ Created: 2018/08/31@ Return: ************************************/void DelLineData(char* fileName, int lineNum){ ifstream in; in.open(fileName); string strFileData = ""; int line = 1; char lineData[1024] = {0}; while(in.getline(lineData, sizeof(lineData))) { if (line == lineNum) { strFileData += "\n"; } else { strFileData += CharToStr(lineData); strFileData += "\n"; } line++; } in.close(); //写入文件 ofstream out; out.open(fileName); out.flush(); out<<strFileData; out.close();}/************************************@ Brief: 修改行数据@ Author: woniu201 @ Created: 2018/08/31@ Return: ************************************/void ModifyLineData(char* fileName, int lineNum, char* lineData){ ifstream in; in.open(fileName); string strFileData = ""; int line = 1; char tmpLineData[1024] = {0}; while(in.getline(tmpLineData, sizeof(tmpLineData))) { if (line == lineNum) { strFileData += CharToStr(lineData); strFileData += "\n"; } else { strFileData += CharToStr(tmpLineData); strFileData += "\n"; } line++; } in.close(); //写入文件 ofstream out; out.open(fileName); out.flush(); out<<strFileData; out.close();}int main(){ char lineData[1024] = {0}; ReadLineData("D:\\project\\cpp\\2010\\jsondemo\\jsondemo\\1.json", 21, lineData); cout << lineData << endl; DelLineData("D:\\project\\cpp\\2010\\jsondemo\\jsondemo\\1.json", 10); ModifyLineData("D:\\project\\cpp\\2010\\jsondemo\\jsondemo\\1.json", 10, "aaaaaaaaaaaaaa"); getchar();}
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