C++ reset read pointer

[johnd0e]

Hi everyone,
I'm looking for a way to reset the read / write pointers of an fstream (ios::in|ios::base|ios::binary) to 0 without the use of seekp(0)/ seekg(0).
(This is a small part of an assignment I have not been able to solve or find any clue on how to attack this problem. The rest is already solved.)
Below is the code I'm using right now ( with(!) seekp()|seekg()) to test the rest of the program.

void File::moveTo(uint pos)
	{ 
		if (!_file.is_open())
		{
			cout << "problem with file \n";
		}
		_actpos = _file.tellg();
		if ((pos*_recSize) < _actpos)
		{
			_file.seekp(0);
			_file.seekg(0);
			//cout << "Reset: " << _actpos << " --|--";
		}
		_actpos = _file.tellg();
		while((pos*_recSize) != _actpos)
		{
			_file.read(_recBuffer, _recSize);
			_actpos = _file.tellg();
		}		
	}

If anyone could give me a clue, hint, solution or whatever on how to solve that problem, I'd really appreciate it.

Thanks for your help in advance.

 

[Viro]

Well, seeing as some time has passed, your assignment should probably already be over.

So, if you're interested in getting to the start of a file without using seekp/seekg, just close the file and reopen it! That will guarantee that you'll be at the start of the file.