When writing to a text file how do you...

Erase all the text on a certain line?
and then
Write to this line?

Code:

---

  ofstream mnfile(c:\\temporary.txt, ios::ate);
 
    mnfile.getline(input, 255, '\n');
    mnfile<<(manumb);
    mnfile.close();

---

I tried using the getline function, but it isn't recognised within ofstream

Thanks JamMan..

Ok ofstream is an OUTPUT stream so you will not be able to use it to READ IN text.
If you wish to open a file and change one full line do this
What you need to do is open the file, and write to a new temp file.
Replace the line that you want, then delete the orignal file and rename the temp file

Code:

---

ifstream input("file.txt");
ofstream output("temp");
string s;
while( ! input.eof() )
{
 input.getline( s,255,'\n');
 //if it the line to replace do it here

 output << s;
}
input.close();
output.close();
remove("file.txt");
rename("temp","file.txt");

---

there you go that should help

Thats helped, :)
but I'm getting a compiler error. :(
Here's my code:

Code:

---

    ifstream input("file.txt");
    ofstream output("temp");
    string s;
    int i = 0;
while( ! input.eof() )
{
input.getline(s, 255, '\n');                //!!!!!!!!!!!!!!!!!!!!!!!!!!!!

if (i == 0) output << manumb;

else output << s;

i++;
}
 input.close();
output.close();
remove("file.txt");
rename("temp","file.txt");

---

On the line with the !'s next to it I'm getting the compiler error??

Its a problem using the getline with ifstream??


:confused:

hmm, try using the getline function

Code:

---

getline(input,s);

---

i think it is in the string header file, and should work fine

>>>input.getline(s, 255, '\n');



s needs to be a character array and not a string.

char s[256];

ifstream_component.getline(s,255); // it assumes newline by default