go to next line in .txt file

[adr]

Hi, I made a writing to a .txt file program. It works fine, but, when I put it my .txt it just replaces that line of the texts in the .txt file. I was wanting know is there a way to go to the nexts line to write the new texts? Here my code:

//<******files and headers are right just my code
    ofstream myfile;
    myfile.open ("learnthis.txt");
    getline(cin,learn);
    learn=say+learn;
    myfile << learn;
    myfile.close();}}}

[joeprogrammer]

There is probably a proper way to do this, but just off the top of my head, why don't you read the contents of the text file before writing? Then you could just append what you want to add to the file, and then replace the file with the new string.

[JaWiB]

If you simply want to add to the end of a file, you can open it with the append flag:

std::ofstream out("somefile.txt",std::ios::app);

Otherwise, I think you will have to search through the file for the correct position, and use seekp to set the write position (no pun intended)

[adr]

Ok I see what your saying joeprogrammer. You mean something like, openfile, save as a string, add strings togather, then that be the new string? I will try that, I didnt think of that.

JaWiB: LOL, I know you dont mean it as a pun but, I never use seekp. Could you show a small way to use it?

[JaWiB]

AFAIK you can't just insert stuff in the middle of the file, you have to manually write over everything. Here's a little example:

/* test.txt:
Line1
Line2
Line4
Line5
*/
#include <fstream>
#include <string>

int main ()
{
  std::fstream file("test.txt",std::ios::in|std::ios::out);
  std::string line;
  std::string buffer;
  std::streampos linepos;
  bool found = false;
  while (file>>line)
  {
    if (line=="Line2")
    {
      file.ignore();//ignore the endline character
      linepos = file.tellg();//get this file read position
      found=true;
    }
    else if (found)
    {
      buffer+=line+'\n'; //store what was after that line so we can rewrite it later
    }
  }
  //we've hit the end of the file, so eofbit is set
  file.clear(); //clear all the state flags
  file.seekp(linepos); //find the pos where we want to insert
  file<<"Line3\n"<<buffer; //write the line, then the rest of the text

}

[mabufo]

Are you able to pass the '\n' bit, (I forget the word for it) to the text file? And by doing so, start on a new line?

[linucksrox]

yes, and it is called a newline character