reading and deleting from file

[lumpybanana247]

what i want to do is load a file and assign each line to a different string.

but, i cannot figure out how to do that, so, to help me do that, can you read the first line of a file, assign it to a string, and delete the line?

thanks

[sicarie]

Is the file fixed in size? Do you know how many lines it will have every time? If yes, you could use a string array to hold each line, otherwise, I'd recommend either a vector (so it would be very array-like), or a linked list (if you want to do manipulations or moving the places of lines).

Once you figure that out, you can read in the whole file, and either use the API to delete and recreate an empty file, or you can try opening the file to write (and not append), which might (you'd have to try it to make sure, but I'm almost positive it would) overwrite the file (ie overwrite it with a null or some single whitespace char).

Does that make sense, or are you confused with a certain part?

[lumpybanana247]

Is the file fixed in size? Do you know how many lines it will have every time? If yes, you could use a string array to hold each line, otherwise, I'd recommend either a vector (so it would be very array-like), or a linked list (if you want to do manipulations or moving the places of lines).

Once you figure that out, you can read in the whole file, and either use the API to delete and recreate an empty file, or you can try opening the file to write (and not append), which might (you'd have to try it to make sure, but I'm almost positive it would) overwrite the file (ie overwrite it with a null or some single whitespace char).

Does that make sense, or are you confused with a certain part?

I created a function that gets the number of lines in the file and converts in to an 'int' but that will vary from about 1-1000.
if its a simple response, can you tell me how to make 'a string array hold each line'- if its hard, i could research it
thanks again

[sicarie]

I created a function that gets the number of lines in the file and converts in to an 'int' but that will vary from about 1-1000.
if its a simple response, can you tell me how to make 'a string array hold each line'- if its hard, i could research it
thanks again

Well, I should have clarified, its either an array of strings or an array of char *'s. Sorry about that. But once you have your array/vector/list declared, you would open the file and give it a filehandle, then I would recommend using getline() to put the line into the string. I would also recommend the file IO tutorial at cplusplus.com, it gives a pretty good explanation as well as showing useful code examples.

[lumpybanana247]

Well, I should have clarified, its either an array of strings or an array of char *'s. Sorry about that. But once you have your array/vector/list declared, you would open the file and give it a filehandle, then I would recommend using getline() to put the line into the string. I would also recommend the file IO tutorial at cplusplus.com, it gives a pretty good explanation as well as showing useful code examples.

thank you very mmuch sicarie

[sicarie]

thank you very mmuch sicarie

No problem, post again if you get stuck!