Simple NSSArray regarding strings and NSRangeException - iphone

Question

I have a simple question. I am designing some simple highscores code yet I am having alot of trouble with it, specifically storing and saving players names. I have not been programming for very long in obj-c, only 2 weeks. I am not quite sure what is going on when I use NSStrings in an array.
Here is the code for saving strings:
-(NSString *) getFilePath2 {
NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[pathArray objectAtIndex:0] stringByAppendingPathComponent:#"savedFile2.plist"];
}
-(void) savePlayerNameData {
NSArray *highScoreNames = [[NSArray alloc]
initWithObjects:
playerName1,
playerName2,
playerName3,
playerName4,
playerName5,
nil];
[highScoreNames writeToFile:[self getFilePath2] atomically:YES];
}
-(void) loadPlayerNameData{
// load data here
NSString *myPath = [self getFilePath2];
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:myPath];
if (fileExists) {
NSArray *values = [[NSArray alloc] initWithContentsOfFile:myPath];
playerName1 = [values objectAtIndex:0];
playerName2 = [values objectAtIndex:1];
playerName3 = [values objectAtIndex:2];
playerName4 = [values objectAtIndex:3];
playerName5 = [values objectAtIndex:4];
}
else {
NSLog(#"first Launch. no file yet");
}
}
I end up getting this error :
2012-08-15 22:25:30.780 Pig Fly![5304:f803] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFArray objectAtIndex:]: index (0) beyond bounds (0)'
*** First throw call stack:
(0x14c5022 0xec5cd6 0x146da48 0x146d9b9 0x14bec30 0xbd21 0x62e2 0x964eb6 0x1499936 0x14993d7 0x13fc790 0x13fbd84 0x13fbc9b 0x13ae7d8 0x13ae88a 0x28626 0x1fdd 0x1f45)
terminate called throwing an exception(lldb)
However, what I find very interesting is that when I write similar code for saving int values, The program runs fine. This is the working int code:
-(NSString *) getFilePath {
NSArray *pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[pathArray objectAtIndex:0] stringByAppendingPathComponent:#"savedFile.plist"];
}
-(void) saveData {
//save data here
NSArray *highScores = [[NSArray alloc]
initWithObjects:
[NSString stringWithFormat:#"%i",highScore1],
[NSString stringWithFormat:#"%i",highScore2],
[NSString stringWithFormat:#"%i",highScore3],
[NSString stringWithFormat:#"%i",highScore4],
[NSString stringWithFormat:#"%i",highScore5],
nil];
[highScores writeToFile:[self getFilePath] atomically:YES];
}
-(void) loadData{
// load data here
NSString *myPath = [self getFilePath];
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:myPath];
if (fileExists) {
NSArray *values = [[NSArray alloc] initWithContentsOfFile:myPath];
highScore1 = [[values objectAtIndex:0] intValue];
highScore2 = [[values objectAtIndex:1] intValue];
highScore3 = [[values objectAtIndex:2] intValue];
highScore4 = [[values objectAtIndex:3] intValue];
highScore5 = [[values objectAtIndex:4] intValue];
}
else {
NSLog(#"first Launch. no file yet");
}
}
Can anybody tell me what is going on? What are the differences that need to be kept in mind when writing NSArrays for ints and NSStrings?

Answer 1

Make sure that playerName1 is not NULL.