Re: File Manipulation
Re: File Manipulation
- Subject: Re: File Manipulation
- From: Oleg Svirgstin <email@hidden>
- Date: Mon, 10 Mar 2003 11:56:53 +0300
NSFileHandle.
It is possible use plain C to do things with files (someone might call it
UNIX).
Oe even the C++ streams (naming the source file to do this as ".mm" or even
".cp" if that file will contain no Obj-C)
There are many other ways, (several of them in Carbon).
Most likely it is the best to go with instances of NSFileHandle.
Regards
Oleg
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From: Seth Willits <email@hidden>
>
Date: Mon, 10 Mar 2003 00:05:30 -0800
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To: email@hidden
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Subject: File Manipulation
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I'm writing an app which will open two files and modify the contents of
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one file based on the other (a simple patching utility). Everything is
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going well so far, but I'm just now getting to the file manipulation.
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It seems to me that I should open the patch file into an NSData object
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and the original file into an NSMutableData object. I'm attempting to
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read bytes from the NSData object using subdataFromRange and then set
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some bytes in the NSMutableData object, but I wonder, if this is the
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best way. Also, I'm trying to figure out how to get the integer value
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of a specific range of bytes in the NSData object. If the three bytes
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are "A9B" then I need to get the hex value which would be 2715. Would
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it be easier to simply work with strings?
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Also, another question. Can I open a file as stream and read as I go
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along instead of reading it all into memory at once? Similarly, can I
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write to a specific byte offset in a file (overwriting the given amount
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of bytes) without having to open that file in memory, swap the data,
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and then write the file out?
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Thanks,
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>
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Seth Willits
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President and Head Developer of Freak Software - http://www.freaksw.com
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Q&A Columnist for REALbasic Developer Magazine -
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http://www.rbdeveloper.com
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>
"Standing up for what you believe in is never a waste of time."
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-- Seth Willits
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