NSTableView with NSArray and C-array question
NSTableView with NSArray and C-array question
- Subject: NSTableView with NSArray and C-array question
- From: Gilles Celli <email@hidden>
- Date: Thu, 12 Oct 2006 18:18:37 +0200
Hello everyone,
My first post here, I hope it fits in this list...
I'm porting a C-based data acquistion program running in Mac OS X
Terminal.app to Cocoa.
The C-based data acq. program scans 16 channels from a Keithley 2700
(with 7700 multiplexer) Multimeter every 5 seconds via USB-to-Serial
Port.
The multimeter spits out a string which then I convert to 'double'
float values in a C-array. This works great since a couple of months.
The main part of it, acquiring data every 5 sec works fine also in
Cocoa (using NSTimer etc.)
However displaying the data with NSTableView gives me more headaches...
[1]. Should I use only *one* NSMutableArray or *multiple*
NSMutableArray for the channels ?
My understanding is that NSTableView needs an NSArray to display the
data row-wise, so I can't use the C-array directly....
(Since the array grows up every 5 seconds....(so for one day we get
about: 86400sec / 5sec = 17280 lines).
So for 16 channels: (16*17280) = 276480 data values for a full
day...this will make a really big array, IMHO.)
[2]. How to simplify the output of data with method (id)tableView:
(NSTableView *)tableView objectValueForTableColumn....?
I've tried using this for the 16 columns:
if ( [[Column identifier] isEqualToString:@"1"])
{
return [array objectAtIndex:Row];
}
etc.
This works less or more but every row gets the same value as the row
before!!! It drives me nuts!
Does someone have any suggestions with [array valueForKey....] ?
Any suggestions will be greatly appreciated.
Cheers,
Gilles Celli
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