Inserting into file without overwriting?
How do I insert data at the beggening of the file so that it moves everything over and doesn't overwrite the existing data?
Do I have to write to another tempory file the data I want to add then read in existing file and append it to the temporary file in order to get that result? Is there a better way?
file1.txt:
Hendrix
file1.txt after adding data the way I want it:
Jimi Hendrix
instead of like this:
Jimirix
Last edited by WebSnozz; 04-21-2002 at 04:40 AM.
WebSnozz-
Cats have no butt cheeks.
If one farted, then it would make a flute noise.
You have to use the append mode
ios::app
but before that you will have to follow your method if you want it to append to the begining of file..
I think you are going to have to read the "hendrix" part into a string, then clear the file, and put "jimi" and your string back in.
I have been having a similiar problem with a numerical file, and our genious in residence has been less then forthcoming on how to use direct offsets in a text file.
I was afraid of that. I think I'll read the letters one at a time, push the char onto a STL queu, write my new char, and do that in a loop until I'm done writing and then continue in another loop that pushes the next char onto the queu and pops the last one of and writes it that way I don't have to make another file.
WebSnozz-
Cats have no butt cheeks.
If one farted, then it would make a flute noise.
Haven't investigated this one myself (sorry) but have you tried writing to ios::cur?
Upon opening, as everyone knows, the pointer is set at the beginning of the file.
THe default, of course, is 'ios::trunc', but I don't know if, when you write at 'ios::cur' (current), you can "push" your existing file.
Just a thought.
"When the only tool you own is a hammer, every problem begins to resemble a nail." Abraham Maslow
