NSMutableArray shows some hex content instead of actual values [duplicate] - objective-c

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Closed 10 years ago.
Possible Duplicate:
NSMutableArray Not showing actual values when NSLog in iphone application
I have NSMutableArray initialised as follows:
- (id)init
{
self = [super init];
if (self)
{
mySpotsArray = [[NSMutableArray alloc]init];
}
return self;
}
The array stores data of NSTable as follows:
//-----------------------------------------
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
return [mySpotsArray count];
[self saveMySpots];
}
//-----------------------------------------
- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
{
Spot *sp = [mySpotsArray objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
return [sp valueForKey:identifier];
[self saveMySpots];
}
//-----------------------------------------
- (void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
{
Spot *sp = [mySpotsArray objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
[sp setValue:object forKey:identifier];
[self saveMySpots];
}
I am adding and deleting objects like this:
//-----------------------------------------
- (IBAction)addSpot:(id)sender
{
[mySpotsArray addObject:[[Spot alloc]init]];
[mySpotsTable reloadData];
[self saveMySpots];
}
//-----------------------------------------
- (IBAction)deleteSpot:(id)sender
{
NSInteger row = [mySpotsTable selectedRow];
[mySpotsTable abortEditing];
if (row !=-1)
{
[mySpotsArray removeObjectAtIndex: row];
}
[mySpotsTable reloadData];
[self saveMySpots];
}
I am saving and loading array content like this:
//-----------------------------------------
- (void) saveMySpots
{
savedSpots = [NSUserDefaults standardUserDefaults];
encodedMySpotsArrayObject = [NSKeyedArchiver archivedDataWithRootObject: mySpotsArray];
[savedSpots setObject: encodedMySpotsArrayObject forKey:[NSString stringWithFormat:#"MySpotsArrayKey"]];
}
//-----------------------------------------
- (void) loadMySpots
{
savedSpots = [NSUserDefaults standardUserDefaults];
decodedMySpotsArrayObject = [savedSpots objectForKey: [NSString stringWithFormat:#"MySpotsArrayKey"]];
mySpotsArray = [NSKeyedUnarchiver unarchiveObjectWithData: decodedMySpotsArrayObject];
}
Objects are encoded and decoded like this:
//-----------------------------------------
- (id)init
{
self = [super init];
if (self)
{
_mySpot = #"My Spot";
_localOffset = 0;
}
return self;
}
//-----------------------------------------
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject: self.mySpot forKey:#"MySpotKey"];
[encoder encodeInt: self.localOffset forKey:#"LocalOffsetKey"];
}
//-----------------------------------------
- (id)initWithCoder:(NSCoder *)decoder
{
self = [super init];
if( self != nil )
{
self.mySpot = [decoder decodeObjectForKey:#"MySpotKey"];
self.localOffset = [decoder decodeIntForKey:#"LocalOffsetKey"];
}
return self;
}
Everything is properly defined in their respective .h like this
NSMutableArray *mySpotsArray;
NSUserDefaults *savedSpots;
NSData *encodedMySpotsArrayObject;
NSData *decodedMySpotsArrayObject;
All works perfect on UI level, i.e. the table is properly displayed, added, deleted, saved and loaded. But when I am trying to NSLog like this:
NSLog(#"%#", mySpotsArray);
I get this:
2012-09-19 13:41:25.372 Spot[1541:303] (
"<Spot: 0x100674ab0>",
"<Spot: 0x100674c20>",
"<Spot: 0x100675040>"
)
I've also tried this:
NSString *strData = [[NSString alloc]initWithData: decodedMySpotsArrayObject encoding:NSUTF8StringEncoding];
NSLog(#"strData: %#", strData);
and I get this:
2012-09-19 13:41:25.371 Spot[1541:303] strData: (null)
I simply need to access NSMutableArray content and then convert it to strings. The actual content what I see on UI is a table with 2 columns and 3 rows:
Yerevan 2
London -1
Los Angeles -9
What am I doing wrong?
Thanks

Answer 1

I think this is the expected behavior.
How does the debugger know what it should print to the console? If you want it to print something else, e.g. some property on the Spot object, you need to provide Spot with a description method.
For example:
#import <Foundation/Foundation.h>
#interface Foo:NSObject {
NSString *_bar;
}
#property (nonatomic, copy) NSString *bar;
#end
#implementation Foo
#synthesize bar = _bar;
- (NSString *)description {
return self.bar;
}
#end
int main(int argc, char *argv[]) {
NSAutoreleasePool *p = [[NSAutoreleasePool alloc] init];
NSMutableArray *objs = [[NSMutableArray alloc] init];
Foo *myFoo = [Foo new];
myFoo.bar = #"Mine";
Foo *yourFoo = [Foo new];
yourFoo.bar = #"Yours";
[objs addObject:myFoo];
[objs addObject:yourFoo];
NSLog(#"Objs = %#",objs);
[p release];
}
prints this to the console:
2012-09-19 06:57:10.375 Untitled 2[59494:707] Objs = (
Mine,
Yours
)
But without the description method, this is what prints to the console:
2012-09-19 07:01:12.542 Untitled 2[59853:707] Objs = (
"<Foo: 0x7f9773c080c0>",
"<Foo: 0x7f9773c0a9b0>"
)

Answer 2

Add this method in your Spot class
- (NSString *)description
{
NSString *str = [[NSString alloc] initWithFormat:#"%# \n %# \n%#",Var1,Var2,var3];
return str;
}
replace Var1, Var2 and Var3 with your original variable name.