Re: Read lines from very large text file
Re: Read lines from very large text file
- Subject: Re: Read lines from very large text file
- From: Clark Cox <email@hidden>
- Date: Fri, 6 Feb 2009 21:39:28 -0800
On Fri, Feb 6, 2009 at 9:30 PM, Sean McBride <email@hidden> wrote:
> Joar Wingfors (email@hidden) on 2009-02-06 12:06 AM said:
>
>>> How can you guarantee a file's existence? sudo rm -f?
>>
>>How about calling open() on it?
>
> :) But note the latter part of the sentence: "this method should only
> be used if the file is guaranteed to exist _for the duration of the data
> object's existence_." So if I create an NSData with
> dataWithContentsOfMappedFile and then the user deletes the backing file,
> then what?
Even if you delete the file from the filesystem, you are just deleting
the mapping from that particular filename to the file's actual data.
The actual "file" still there until the last process with an open
handle closes it, so open()'ing a file will guarantee that it exists
until you close() it, or your process terminates.
>I just tried in a little test app: open(),
> dataWithContentsOfMappedFile, breakpoint, rm file, access the NSData.
> Seems to work.
Indeed.
--
Clark S. Cox III
email@hidden
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