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I have a text file, say it is text.txt, and I want to put it in an array, but I don't want there to be a limit on the array's size. I want it to be able to handle insanely large number of characters in a string, and then overwrite the text with the output.
Then you want the STL.
A vector<string> is effectively a boundless array of boundless arrays of characters.
If you want them to be indexed by keywords, then a map<string, string> would be more effective.
You can use vector or create a class that loops and creates new variables with each input using new keyword. Vectors may be easier though.
1) Does a "vector" work like a string (same commands...)
2) How do I declare a vector/ use it?
Thanks!
No, it works much less like a string and rather more like a vector.
You can find a bit of info here. (And yes I looked over this one first to make sure the info was at least semi legit)
Perhaps you should consider to only read portions of the file at one time, process it and then read some more.Quote:
Originally posted by Trauts
I want it to be able to handle insanely large number of characters in a string, and then overwrite the text with the output.
If you really mean insanely large, remember that most implementations of fstream has a 2-4 GB file size limit (actually this has caused me some trouble) and you can never allocate more than 4 GB memory on a windows system (Win32, that is, win64 is not very common).
an insanely large number of characters... not of file size.
I'll just do part of a file at a time... no point in learning that before I'm ready
I'm confused... I made a program that created a 27 gb text file... what am I missing?Quote:
most implementations of fstream has a 2-4 GB file size limit
nothing, your implemenation does not have this limit.Quote:
Originally posted by Hunter2
I'm confused... I made a program that created a 27 gb text file... what am I missing?
... okay, sounds good :)
Did you use Windows API functions? The API functions are always capable of creating large files.Quote:
Originally posted by Hunter2
I'm confused... I made a program that created a 27 gb text file... what am I missing?
But most (some?) implementations of the standard library uses a 32-bit integer to store the filesize. Naturally, problems occur when opening a file larger than 4GB.
Well, I used a std::ofstream and used a for loop, each iteration writing another character to the file... is that Windows API?
no
What? No analysis of why it worked based on my response? :p
>But most (some?) implementations of the standard library uses a 32-bit integer to store the filesize
I currently use API specific functions to handle files. However, I am thinking about re-writing large parts of my code to make it non-OS specific & portable. I need to access large files (i.e. size > 4GB).
Are you saying that standard C++ methods do not allow for files > 4GB on a 32 bit OS?
Whether the OS is 32-bit or not is irrelevant. What will cause you touble is if the standar libraray is old and only uses 32-bit integers to store the streams size.Quote:
Originally posted by Davros
Are you saying that standard C++ methods do not allow for files > 4GB on a 32 bit OS?
Some implementation uses 64-bit and then everything is fine, that's why it worked for you, Hunter2.
Okee day :)