Creating/Saving a document package
Creating/Saving a document package
- Subject: Creating/Saving a document package
- From: Daniel Stark <email@hidden>
- Date: Wed, 21 Aug 2002 19:47:19 -0500
I am making a little 2d racing game in objective c and want to save
courses as document packages. I have looked through the archives and
found a few helpful posts but I'm still having trouble. I have added an
file type with extension ".track" to my app. I have placed the built app
into the Applications folder logged out and in and the finder/launch
services seems to have caught on (I can create a folder and add the
".track extension and it turns into a package).
Now my problem, I gather I use the FileWrapper class to create these
files programmatically but I can't seem to get it to work, here is my
code. I get this error when the following method is run:
*** -[NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt
to insert nil value
Seems the although data has data but the coursewrapper FileWrapper is
null. How can I load my data into the wrapper and once I do will the
result of the rest of the method be a file on my desktop (Malibu.track)
that contains "course"
- (IBAction)saveIt:(id)sender
{
BOOL result;
NSDictionary *dict;
NSFileWrapper *wrapper;
NSData *data;
NSFileWrapper *coursewrapper = [[NSFileWrapper alloc]
initWithSerializedRepresentation:[NSArchiver
archivedDataWithRootObject:course]];
data = [NSArchiver archivedDataWithRootObject:course];
[coursewrapper setPreferredFilename:@"course"];
dict = [NSDictionary dictionaryWithObject:coursewrapper
forKey:@"course"];
wrapper = [[NSFileWrapper alloc] initDirectoryWithFileWrappers:dict];
[wrapper writeToFile:@"/Users/dstark/Desktop/Malibu.track"
atomically:YES updateFilenames:YES];
}
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