I have looked at the sample code and still not able to figure out some key functionality of the framework without more in depth documentation. Normally there are books about frameworks but it seems like with this framework, you're on your own until it picks up more mainstream usage.
How do I get the roster list? I see that XMPPRosterCoreDataStorage has an NSMutableSet of rosterPopulationSet. Is this the set of XMPPUserCoreDataStorageObjects, i.e., users, that make up a roster?
My way I'm guessing is a hack--get the presence of every user as it's announced, and stash it in an array. Those are the online buddies. Somehow get the entire roster list, and everyone who is not online, is offline.
I figure that there should be an array of XMPPUserCoreDataStorageObjects, i.e., 30 contacts, 30 entries in the XMPPUserCoreDataStorageObjects table?
How would I access this array and how would I tell if they are online or not?
For online status, am I supposed to query something else, b/c it's not encapsulated in XMPPUserCoreDataStorageObjects is it?
I suppose I could use the didReceivePresence or similar methods, but all in all, I want to use the framework and not fight against it.
Appreciate it!
Thanks
Use XMPPRoster extension with either XMPPRosterCoreDataStorage or XMPPRosterMemoryStorage
Take a look at following code. Please note that this is not complete code but should give you an idea.
XMPPRosterMemoryStorage *rosterstorage = [[XMPPRosterMemoryStorage alloc] init];
xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:rosterstorage];
[xmppRoster activate:xmppStream];
[xmppRoster fetchRoster];
Related
I've got this command line app that iterates through CSV files to create a Core Data SQLite store. At some point I'm building these SPStop objects, which has routes and schedules to-many relationships:
SPRoute *route = (SPRoute*)[self.idTransformer objectForOldID:routeID ofType:#"routes" onContext:self.coreDataController.managedObjectContext];
SPStop *stopObject = (SPStop*)[self.idTransformer objectForOldID:stopID ofType:#"stops" onContext:self.coreDataController.managedObjectContext];
[stopObject addSchedulesObject:scheduleObject];
[stopObject addRoutesObject:route];
[self.coreDataController saveMOC];
If I log my stopObject object (before or after saving; same result), I get the following:
latitude = "45.50909";
longitude = "-73.80914";
name = "Roxboro-Pierrefonds";
routes = (
"0x10480b1b0 <x-coredata://A7B68C47-3F73-4B7E-9971-2B2CC42DB56E/SPRoute/p2>"
);
schedules = (
"0x104833c60 <x-coredata:///SPSchedule/tB5BCE5DC-1B08-4D11-BCBB-82CD9AC42AFF131>"
);
Notice how the routes and schedules object URL formats differ? This must be for a reason, because further down the road when I use the sqlite store and print the same stopObject, my routes set is empty, but the schedules one isn't.
I realize this is very little debugging information but maybe the different URL formats rings a bell for someone? What could I be doing wrong that would cause this?
EDIT: it seems that one SPRoute object can only be assigned to one SPStop at once. I inserted breakpoints at the end of the iteration and had a look a the sqlite every time and I definitely see that as soon as an SPRoute object (that already had been assigned to a previous stop.routes) is assigned to a new SPStop, the previous stop.routes set gets emptied. How can this be?
Well, we had disabled Xcode's inverse relationship's warning which clearly states:
SPStop.routes does not have an inverse; this is an advanced
setting (no object can be in multiple destinations for a specific
relationship)
Which was precisely our issue. We had ditched inverse relationships because Apple states that they're only good for "data integrity". Our store is read-only so we figured we didn't really need them. We learn now that inverse relationships are a little more than just for "data integrity" :P
I'm currently using a singleton as a data store for my app. I essentially store a number of events that are pulled and parsed from a web service and then added as needed. Each time I make a request from the web service, I parse the results and see if the items already exist. If they do, I delete them and add the updated version provided by the web service.
Everything appeared to be working properly until I fired up the Instruments panel to find out that my system is leaking the objects every time it loads them from the web service (from the second time on). The core method where things appear to be messing up is this one, which is located in my HollerStore singleton class:
- (void)addHoller: (Holler *)h
{
//Take a holler, check to see if one like it already exists
int i = 0;
NSArray *theHollers = [NSArray arrayWithArray:allHollers];
for( Holler *th in theHollers )
{
if( [[th hollerId]isEqualToString:[h hollerId]] )
{
NSLog(#"Removing holler at index %i", i);
[allHollers removeObjectAtIndex:i];
}
i++;
}
[allHollers addObject:h];
}
Quick explanation: I decided to copy the allHollers NSMutableArray into theHollers because it's being updated asynchronously by NSURLConnection. If I update it directly, it results in a crash. As such, I switched to this model hoping to solve the problem, however the Instruments panel is telling me that my objects are leaking. All the counts are exactly the # of items I have in my data set.
From what I can tell removeObjectAtIndex isn't effectively removing the items. Would love to get the thoughts of anybody else out there on three things:
Is my analysis correct that something else must be retaining the individual hollers being added?
Should I be using CoreData or SQLite for storing information pulled from the web service?
Do you know how long data stored in a Singleton should be available for? Until the app is killed?
Update
I think I've found the source, however perhaps someone can provide some clarity on the proper way to do this. I've created a method called parseHoller which takes a dictionary object created through SBJSON and returns my own model (Holler). Here are the last couple lines:
Holler *h = [[[Holler alloc] initFromApiResponse:hollerId
creatorId:creatorId
creatorName:creatorName
creatorImageUrl:creatorImage
comments:comments
attendees:attendees
wishes:wishes
invitees:invites
createdAt:createdAt
text:text
title:title
when:when]autorelease];
//(some other autorelease stuff is here to clean up the internal method)
return h;
I figured that since I'm returning an autoreleased object, this should be fine. Do you see anything wrong with this?
Have you tried to do a retain count on the objects that is leaking? Maybe that could clear up when or where it is being retained.
The code should be
[putObjectHere retainCount];
and then write to an NSLog
Hope it gives you something
Peter
I'm using ABPeoplePicker to show a list of contacts.
I'd like to filter this list of contacts to only show the contacts that have email addresses. How would I do so?
I needed it, so I started working on something like that. Check out https://github.com/stuffmc/MCFilteredPeoplePickerNavigationController
here is the good blog tutorial for extracting address book values,
http://blog.slaunchaman.com/2009/01/21/cocoa-touch-tutorial-extract-address-book-address-values-on-iphone-os/
try with below:
ABPeoplePickerNavigationController *peoplePicker = [[ABPeoplePickerNavigationController alloc] init];
[peoplePicker setPeoplePickerDelegate:self];
[peoplePicker setDisplayedProperties:[NSArray arrayWithObject:[NSNumber numberWithInt:kABPersonEmailProperty]]];
ABContactHelper is a greater wrapper for the Addressbook and has some methods for filtering contacts based on various things.
https://github.com/erica/ABContactHelper
I'm trying to do a similar thing. I've gotten an instance of ABAddressBook, removed the entries I don't want, then set picker.addressBook = filteredBook. It...KINDA works. The list seems to be filtered, but entries are duplicated like it expects the full list to be there and it just copies existing entries until it has the expected count, or something.
I am trying to stream sensor data from the iRobot Create. I get tuple out of range errors when I try
bot.stream_sensors(somenumber) and bot.poll_sensors(somenumbers). Whenever I input bot.sensors, I just get an empty array {}. I have even tried sending bot.sensors while pushing in on the bump sensor, still getting an empty array. I am connected to the bot through the Serial port with a serial-to-usb converter on my side. The only code before trying to get the sensor data is
import openinterface
bot = openinterface.CreateBot(com_port="/dev/ttyUSB0", mode="full")
Does anyone have an idea of how to solve this issue? Everywhere else just uses stream_sensors(6) and it seems to work fine.
P.S. I posted a question similar to this topic not too long ago, but no one responded. Not trying to spam, but now I have a more clear question and what the apparent-problem is so I thought I would try again.
I downloaded openinterface.py from this site: which included some sample programs. I'd suggest you take a step back, try the sample code, try to find other, more sophisticated, sample code and play with that first before moving on to your real code. You may be missing a step somewhere.
I may be a bit late to answer this, but for reference purposes. Directly controlling the iRobot is simplified greatly by using
Pyrobot.
In the "sample code" in iOS Dev Center there is a TableViewSuite.
In the first example SimpleTableView the simulator provides a list of time zones by country.
I can not find the list they are pulling from!
it appears to be an array but I can't find the actual words that are coming up on the simulator screen in Xcode.
I've learned about plists and dictionarys and Arrays and simply can't find where the names are coming from.
I found this line:
// Retrieve the array of known time zone names, then sort the array and pass it to the root view controller.
NSArray *timeZones = [NSTimeZone knownTimeZoneNames];
rootViewController.timeZoneNames = [timeZones sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)];
Again, where is it retrieving the information from?
Thanks again.
They're coming from this message:
[NSTimeZone knownTimeZoneNames]
Which is documented as such:
Returns an array of strings listing the IDs of all the time zones known to the system.
So essentially they're predefined somewhere in iOS and the names are simply being queried off the system.
+[NSTimeZone knownTimeZoneNames] gets the list of time zones from the system itself. There is no list in the project.