On 15 Jan 2009, at 10:31 am, Chunk 1978 wrote:
so an app doesn't need administrative rights to writeToFile in the /
tmp folder?
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Don't do that.
Instead use the FindFolder with the 'kTemporaryFolderType' constant.
Here's a Cocoa wrapper (a category on NSFileManager) to help:
@implementation NSFileManager (FindFolder)
- (NSString*) pathToFolderOfType:(const OSType) folderType
shouldCreateFolder:(BOOL) create
{
OSErr err;
FSRef ref;
NSString* path = nil;
err = FSFindFolder( kUserDomain, folderType, create, &ref);
if ( err == noErr )
{
// convert to CFURL and thence to path
CFURLRef url = CFURLCreateFromFSRef( kCFAllocatorSystemDefault,
&ref );
path = (NSString*) CFURLCopyFileSystemPath( url,
kCFURLPOSIXPathStyle );
CFRelease( url );
}
return [path autorelease];
}
@end
But yes, once you have the path you should have write permission for it.
Note also though, that for the case of "safe saving" (i.e. write to a
temporary file then swap with the 'real' file), you don't need to do
that yourself. Just pass yes in the 'atomically' parameter in methods
such as [NSData writeToFile:atomically:];
hth,
Graham
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