替换txt文件c ++中的行 [英] Replace line in txt file c++

问题描述

我只是想知道因为我在 accounts.txt

中有一个包含 STATUS：USERID：PASSWORD 的文本文件。

示例如下：

OPEN：bob：askmehere：

OPEN：john：askmethere：

LOCK：rob：robmypurse：

我有一个用户输入在我的主要，因为这样的用户可以登录3x else status将从OPEN更改为LOCK

$ b

OPEN：bob：askmehere：

OPEN：john：askmethere：

LOCK：rob：robmypurse：

之后：

OPEN：bob：askmehere：

LOCK：john：askmethere：

LOCK：rob：robmypurse：

我所做的是：

  void lockUser（Accounts& in）{
 //帐户类包含3个属性（string userid，string pass，status）
 
 ofstream oFile; 
 fstream iFile; 
 string openFile =accounts.txt; 
 string status，userid，garbage; 
帐户toupdate; 
 
 oFile.open（openFile）; 
 iFile.open（OpenFile）; 
 
 while（！iFile.eof（））{
 
 getline（iFile，status，'：'）; 
 getline（iFile，userid，'：'）; 
 getline（iFile，garbage，'\\\
'）; 
 
 
 if（userid == in.getUserId（））{
 
 toupdate.setUserId（in.getuserId（））; 
 toupdate.setPassword（in.getPassword（））; 
 toupdate.setStatus（LOCK）; 
 break; 
} 
 
 //这里我应该更新account.txt我该怎么做？ 
 ofile.open（openFile）; 
 
 ofile<< toupdate.getStatus（）<<：<< toupdate.getUserId（）：<< toupdate.getPassword（）< ：<< endl; 
} 
  

解决方案

使用ReadLine你想替换，并使用替换替换你想替换的东西。例如写：

  string Example =Text to find; 
 openFile =C：\\accounts.txt; //文件的路径
 ReadFile（openFile，Example）; 
  

或

  #include< fstream> 
 #include< iostream> 
＃include< string> 
 
 int main（）{
 
 ifstream openFile; 
 string ExampleText = BOB; 
 openFile（accounts.txt）; 
 openFile>> ExampleText; 
 openFile.replace（Example，Hello）; 
  

}

I just wondering cause i have a text file containing STATUS:USERID:PASSWORD in accounts.txt

example it would look like this:

OPEN:bob:askmehere:

OPEN:john:askmethere:

LOCK:rob:robmypurse:

i have a user input in my main as such user can login 3x else status will change from OPEN to LOCK

example after 3 tries of john

before:

OPEN:bob:askmehere:

OPEN:john:askmethere:

LOCK:rob:robmypurse:

after:

OPEN:bob:askmehere:

LOCK:john:askmethere:

LOCK:rob:robmypurse:

what i have done is:

void lockUser(Accounts& in){
// Accounts class consist 3 attributes (string userid, string pass, status)

ofstream oFile;
fstream iFile;
string openFile="accounts.txt";
string status, userid, garbage;
Accounts toupdate;

oFile.open(openFile);
iFile.open(openFile);

    while(!iFile.eof()){

        getline(iFile, status, ':');
        getline(iFile, userid, ':');
        getline(iFile, garbage, '\n');


        if(userid == in.getUserId()){

            toupdate.setUserId(in.getuserId());
            toupdate.setPassword(in.getPassword());
            toupdate.setStatus("LOCK");
            break;
    }

    //here i should update the account.txt how do i do that?
    ofile.open(openFile);

    ofile<<toupdate.getStatus()<<":"<<toupdate.getUserId()":"<<toupdate.getPassword()<<":"<<endl;
}

解决方案

Use ReadLine and find the line you wanna replace, and use replace to replace the thing you wanna replace. For example write:

string Example = "Text to find";
openFile="C:\\accounts.txt"; // the path of the file
ReadFile(openFile, Example);

OR

#include <fstream>
#include <iostream>
#include <string>

int main() {

ifstream openFile;
string ExampleText = BOB;
openFile("accounts.txt");
openFile >> ExampleText;
openFile.replace(Example, "Hello");

}

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