 | | | Working with XML files/CFURL | Working with XML files/CFURL 2003-11-21 - By William MacKay
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Here's what i do to create the CFURL to a file in my bundle:
CFStringRef fileString = CFStringCreateWithCString(kCFAllocatorDefault,
"tankmodel", kCFStringEncodingMacRoman);
CFStringRef extensionString =
CFStringCreateWithCString(kCFAllocatorDefault, "lwo",
kCFStringEncodingMacRoman);
CFURLRef fileURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),
fileString, extensionString, NULL);
That creates a CFURLRef to
"MyGame.app/Contents/Resources/tankmodel.lwo". If you can hardcode the
filename and/or its extension, you can pass CFSTR("lwo"), for instance,
instead of having to create a seperate variable. Then i can load the
file with:
CFURLCreateDataAndPropertiesFromResource(kCFAllocatorDefault, fileURL,
&fileRef, NULL, NULL, &err);
That's the best way i know of to create a CFURLRef to a file within
your bundle. If you're accessing a file outside of your bundle, i'm
sorry to say i've never done that before. But i found a whole bunch of
functions that might help you at
<http://developer.apple.com/documentation/CoreFoundation/Reference/
CFURLRef/Reference/function_group_1.html>. It looks like
CFURLCreateFromFileSystemRepresentation is what you'd need. But there's
a higher level version of the same call named
CFURLCreateWithFileSystemPath. And if you're getting an FSRef from a
file dialog or something you can use CFURLCreateFromFSRef.
Good luck, i hope this helps.
-William MacKay
On 21 Nov 2003, at 00:36, m.b. wrote:
> The doc's suggest I use CFURLCreateDataAndPropertiesFromResource to
> load the xml doc into memory to begin working with it. Well, digging
> around I found that it might be easiest to use
> CFURLCreateFromFileSystemRepresentation. That is where i'm having
> trouble. Before I go asking for help on how to use that am I correct
> in assuming that is the best method to get the CFURLRef for a file in
> my filesystem and should I ask this elsewhere?
>
> on to asking for help....
>
> In doing more research to make sure that I am truly stuck, I believe
> the issue i'm struggling with most is either because of "sourceURL" in
> this example from the docs:
>
> <begin qoute>
> // Load the XML data using its URL.
> CFURLCreateDataAndPropertiesFromResource(kCFAllocatorDefault,
> sourceURL, &xmlData, NULL, NULL, NULL);
>
> // Parse the XML and get the CFXMLTree.
> cfXMLTree = CFXMLTreeCreateFromData(kCFAllocatorDefault,
> xmlData,
> sourceURL,
> kCFXMLParserSkipWhitespace,
> kCFXMLNodeCurrentVersion);
> <end quote>
>
> I cant seem to figure out how to set up sourceURL correctly.
>
> at this point in my games development i'm working on fine tuning some
> statistics, (an easy enough place to start) and I'm trying to read
> from a data and write back to it and other files, I figured XML is the
> way to go with the Core Foundations High Level parser. Let me know if
> I might want to try something else.
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