Re: Question of ofstream / fstream methods to modify a specific line in a text file.

Hello,

I am using the ofstream class to create a text file with keys and
values like:

Key1=Value10
Key2=Value15
Key3=Value20

In case I need to set a new value for Key2, say value50 - I am able to
read and get the value, not sure how to replace that specific value
after '=' for a specific line - Please advice which class / method can
help me achieve this?

thanks
/R

Here is my code snippet:

-----
using namespace std;

#include <iostream>

bool SetVal4Key(std::string Key, std::string Value) {

ofstream cfgfile;
bool status = FALSE;
string sLine;
string buf;
UINT32 pos = 0;
string Delim = "=";

cfgfile.open ("/etc/config.txt", ios::noreplace | ios::app);
if (!cfgfile) {
        cout << Failed to open config file - unable to continue" =

        return status;

}

while (!cfgfile.eof()) {

        std::getline(cfgfile, buf);

        // Dump the content for debugging purpose

        len = buf.size();
        pos = buf.find(Key, 0);

        if (!pos) {
                pos = buf.find(Delim, 0);

                //Modify the string
                buf.erase
                buf= Key;
                buf.append = Value;

                // Write to the specific line in the file=

present
                status = TRUE;
                cfgfile.close();
                status = TRUE;
        }
        cout << "Failed to locate the key" << endl;}

return status;

}