data read zeros?

When I read in a data file that is being written to by another program, do I have to wait unitl it is done writing to display the data? Or could I display the data as it is being writen? Currently I can read a portion of the written file correctly, but it stops and prints out zeros when the data file is still being written to with valid data.

Code:

---


//program that is reading in

 float input;

  /*open data file*/

    ifstream inFile("output");
  //inFile.seekg(0,ios::cur);

  inFile >> input;
  while(!inFile.eof())
  {
  inFile >> input;
  data.push_back(input); //vector
  inFile >> input;
 
    }

---

Thanks

Please don't double post, or both of your posts might get deleted. Just stick to this thread.

Sorry - I probably confused you when I moved the other post to this board. You can ask the questions on the other thread.