Accessing structure member NSDate in NSTableView
Accessing structure member NSDate in NSTableView
- Subject: Accessing structure member NSDate in NSTableView
- From: Gilles Celli <email@hidden>
- Date: Thu, 9 Nov 2006 17:59:24 +0100
Hello,
My problem: How to access the structure member NSDate *acqDate
without copying it to a new structure ?
My code crashes NSTableView !!!
My KeithleyMultimeter class (for performance reason I don't want to
use NSArray but structures instead, this was discussed here several
weeks ago):
@interface KeithleyMultimeter : NSObject {
struct keithley_struct {
NSDate *acqDate;
double channel[MAX_NBR_OF_CHANNELS];
} k2700_data[MAX_ACQ_DATA_PER_DAY];
// KeithleyMultimeter Accessor method
-(struct keithley_struct *)k2700_data
{
return k2700_data;
}
Now in the AcquiController.m class:
-(id) init
{
self= [super init];
k2700 = [[KeithleyMultimeter alloc] init];
return self;
}
....
....
- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:
(NSTableColumn *)Column row:(int)Row
{
int i=0;
struct keithley_struct *k2700_str;
//Copying to new structure, because [k2700 k2700_data[Row].acqDate
doesn't work
k2700_str = [k2700 k2700_data];
// Display date and time
if ( [identifier isEqualToString:@"time"])
{
return [k2700_str[Row].acqDate description]; <= this crashes the
app !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
}
else // display values
{
for (i=0 ; i <= NBR_OF_CHANNELS; i++)
if ( [identifier isEqualToString:[[NSNumber numberWithInt:(i+1)]
stringValue]])
{
return [NSNumber numberWithDouble:k2700_str[Row].channel[i]]; //
this works fine !!!!!!!!!!!!!
}
}
}
Its' mainly crashing when accessing the structure member NSDate....
Why ?
Thanks in advance,
Gilles Celli
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