I'm just learning Cocoa
Have a problem getting some basic information to a file.
MyGameModel contains a Grid, boolean values for game, score and so on..
So as a "Save file" i would like all the information of the gamemodel to be saved.

I'm using the code below but nothing happens.

- (void)didEndSaveSheet:(NSSavePanel *)savePanel returnCode:(int)returnCode contextInfo:(void *)contextInfo {
[savePanel orderOut:nil];
if (returnCode == NSOKButton) {
NSString *filename = [savePanel filename];

NSData *data;

//Accordingly to debugger data gets copyed
data = (MyGameModel*)_myGameModel);

// No file created at all
if (![data writeToFile:filename atomically:YES])
{
NSBeep();
}
}

}


Thanks..

What you're doing is casting your data into an NSData, which isn't going to work. NSData's a container for data..

You need to do something like:


Except, that won't actually work unless your game model is *entirely* stack allocated. If you have an malloced or new'ed arrays that won't work.

If your game model is ObjC, you might look into the NSCoding protocol.

I'm coding in objc

Its writing something..
but when i read it back into the game it comes out as junk..

if (result == NSOKButton) {
NSString *fileToOpen = [oPanel filename];

//Obtain data
NSData *mydata = [NSData dataWithContentsOfFile:fileToOpen];

//read it back into the model
_myGameModel = [NSData dataWithBytes:(const void *)mydata length:sizeof( MyGameModel )];

}

So i'll look in to NSCoder / NSDecoder or i was thinking of directly pulling the values from the class and storing them one by one as strings, maybe easier..

Anyway Thanks,