[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array - iphone

Question

I am getting this error on my project in Xcode;
NSRangeException
[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array
I think the line is here in my initial controller.m file;
Session *item = [dataArray objectAtIndex:0];
NSString* strDate = [LoadSessionController GetTimeString:item.mCreateDate];
cell1.title = #"Restore last session";
cell1.date = strDate;
cell1.ago = [LoadSessionController GetBeforeTimeString:item.mCreateDate];
cell1.image = item.mThumbnail;
cell1.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell1.selectionStyle = UITableViewCellSelectionStyleBlue;
cell = cell1;
break;
}
As the crash log is this;
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x328c429e __exceptionPreprocess + 158
1 libobjc.A.dylib 0x395a697a objc_exception_throw + 26
2 CoreFoundation 0x3280fb70 -[__NSArrayM objectAtIndex:] + 160
3 ColorSplash 0x0001722a 0x1000 + 90666
4 UIKit 0x3861f540 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 408
5 UIKit 0x38604306 -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1306
6 UIKit 0x3861b7c2 -[UITableView layoutSubviews] + 202
7 UIKit 0x385d77fe -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 254
8 QuartzCore 0x3a2abd5e -[CALayer layoutSublayers] + 210
9 QuartzCore 0x3a2ab8fc CA::Layer::layout_if_needed(CA::Transaction*) + 456
10 QuartzCore 0x3a2ac830 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 12
11 QuartzCore 0x3a2ac216 CA::Context::commit_transaction(CA::Transaction*) + 234
12 QuartzCore 0x3a2ac024 CA::Transaction::commit() + 312
13 UIKit 0x385dd8e6 _afterCACommitHandler + 122
14 CoreFoundation 0x328996c8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 16
15 CoreFoundation 0x328979bc __CFRunLoopDoObservers + 272
16 CoreFoundation 0x32897d12 __CFRunLoopRun + 738
17 CoreFoundation 0x3280aeb8 CFRunLoopRunSpecific + 352
18 CoreFoundation 0x3280ad44 CFRunLoopRunInMode + 100
19 GraphicsServices 0x35d4f2e6 GSEventRunModal + 70
20 UIKit 0x386282f4 UIApplicationMain + 1116
But I am convinced the array isn't empty, but perhaps the newer version of iOS requires a different answer to just the :0
Any help would be much appreciated,
Thanks,
Chris
EDIT - Some more info;
- (void)viewDidLoad
{
CGRect frame = CGRectMake(0, 0, SCN_WIDTH, SCN_HEIGHT);
[self.view setFrame: frame];
self.dataArray = [LoadSessionController loadTableData:NO];
self.tableView.rowHeight = ROW_HEIGHT;
}
...Loadsessioncontroller is;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *kCustomCellID = #"MyCellID";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:kCustomCellID];
if (cell == nil)
{
cell = (CustomCell *)[[[CustomCell alloc] initWithFrame:CGRectZero reuseIdentifier:kCustomCellID] autorelease];
}
Session *item = [dataArray objectAtIndex:[self getDataIndex:indexPath.row]];
NSString* strDate = [LoadSessionController GetTimeString:item.mCreateDate];
cell.title = #"Load saved session";
cell.date = strDate;
cell.ago = [LoadSessionController GetBeforeTimeString:item.mCreateDate];
cell.image = item.mThumbnail;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
NSInteger TimeSort(Session *obj1, Session *obj2, void *reverse) {
if ((NSInteger *)reverse == NO) {
if ([obj1.mCreateDate timeIntervalSinceNow] < [obj2.mCreateDate timeIntervalSinceNow])
return NSOrderedAscending;
else
return NSOrderedDescending;
}
else {
if ([obj1.mCreateDate timeIntervalSinceNow] > [obj2.mCreateDate timeIntervalSinceNow])
return NSOrderedAscending;
else
return NSOrderedDescending;
}
}
+ (NSMutableArray*) loadTableData:(BOOL) bLoadRestoreData
{
NSMutableArray* ret = [[NSMutableArray alloc] init];
NSString* path =[NSHomeDirectory() stringByAppendingPathComponent:#"Documents"];
int i;
int nStartNo = 1;
if (bLoadRestoreData)
nStartNo = 0;
for (i = nStartNo; i < 100; i++)
{
if ([Session exist:path index:i])
{
Session* one = [[Session alloc] init];
[one read:path index:i];
[ret addObject:one];
[one release];
}
}
[ret sortUsingFunction:TimeSort context:self];
return ret;
}
+ (NSString*) GetTimeString:(NSDate *)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:
(kCFCalendarUnitHour|kCFCalendarUnitMinute|kCFCalendarUnitYear|kCFCalendarUnitMonth|kCFCalendarUnitDay) fromDate:date];
//[dateFormatter stringFromDate:date]
return [NSString stringWithFormat:#"Saved %02d/%02d/%02d %02d:%02d", components.year, components.month, components.day,
components.hour, components.minute];
}
#define TIME_SUFFIX(a) (((a)>1)?"s":"")
+ (NSString*) GetBeforeTimeString:(NSDate*) date
{
NSTimeInterval ago = [date timeIntervalSinceNow];
unsigned int temp = -ago;
int days = temp / (3600*24); temp = temp % (3600 * 24);
int hours = temp / 3600; temp = temp % 3600;
int minutes = temp / 60; temp = temp % 60;
int seconds = temp;
if (days == 0 && hours == 0 && minutes == 0)
{
return [NSString stringWithFormat:#"%d second%s ago",
seconds, TIME_SUFFIX(seconds)];
}
else if (days == 0 && hours == 0)
{
return [NSString stringWithFormat:#"%d minute%s %d second%s ago",
minutes, TIME_SUFFIX(minutes), seconds, TIME_SUFFIX(seconds)];
}
else if (days == 0)
{
return [NSString stringWithFormat:#"%d hour%s %d minute%s ago",
hours, TIME_SUFFIX(hours), minutes, TIME_SUFFIX(minutes)];
}
else {
return [NSString stringWithFormat:#"%d day%s %d hour%s ago",
days, TIME_SUFFIX(days), hours, TIME_SUFFIX(hours)];
}
}

Answer 1

"But I am convinced the array isn't empty, but perhaps the newer version of iOS requires a different answer to just the :0"
No, this is not the case. Your array is definitely empty. Just log your array before the statement where you think the problem is, and see what you get. If you need to check whether an array is empty, you can either check if array.count is 0 or if array.lastObject is nil.

Answer 2

As your error message says, your dataArray is empty. Either you don't fill it at all, or you access it before filling it.

Answer 3

The array is empty for sure, verify it through an assertion:
NSAssert( [dataArray count] >=1, #"Array is empty");
Then post the code with which you think to fill the array.