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