date:20090526

String Comparison and return values

2009-05-26 Thread John Ku

I am currently trying to compare two string to see if they're equal to each
other. The two values should be equal but when debugging it's giving me a
false return. What gives?
NSString *itemA = [DictionaryA valueForKey:@"FirstProcessIdentifier"];
NSWorkspace *workSpace = [NSWorkspace sharedWorkspace];
for (NSDictionary *apps in [workSpace launchedApplications]) {
  if ( [itemA isEqualTo: [apps valueForKey:
@"NSApplicationProcessIdentifier"]] ) {
NSLog(@"this should run" );
}
}


the NSString "itemA" should contain for example "312" pid
one of the "[apps valueForKey: @"NSApplicationProcessIdentifier"]" should
also return the same "312"

When I NSLog both, there is a matching set "312", but the if statement is
returning false...any tips?

Thanks,
John
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Re: String Comparison and return values

2009-05-26 Thread Graham Cox



On 26/05/2009, at 5:33 PM, John Ku wrote:


isEqualTo



Try -isEqualToString:


--Graham


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Re: String Comparison and return values

2009-05-26 Thread John Ku

Thanks, but its giving me this error now:

* *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to instance
0x147ee0*

*
*

*-John*

On Tue, May 26, 2009 at 12:40 AM, Graham Cox  wrote:

>
> On 26/05/2009, at 5:33 PM, John Ku wrote:
>
>  isEqualTo
>>
>
>
> Try -isEqualToString:
>
>
> --Graham
>
>
>
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Re: String Comparison and return values

2009-05-26 Thread John Ku

Its weird, I saw isEqualToString from the apple documents too, but don't
understand why it isn't recognized

On Tue, May 26, 2009 at 12:42 AM, John Ku  wrote:

> Thanks, but its giving me this error now:
>
> * *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to
> instance 0x147ee0*
>
> *
> *
>
>
> *-John*
>
> On Tue, May 26, 2009 at 12:40 AM, Graham Cox wrote:
>
>>
>> On 26/05/2009, at 5:33 PM, John Ku wrote:
>>
>>  isEqualTo
>>>
>>
>>
>> Try -isEqualToString:
>>
>>
>> --Graham
>>
>>
>>
>
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Re: String Comparison and return values

2009-05-26 Thread Bill Bumgarner


On May 26, 2009, at 12:46 AM, John Ku wrote:
Its weird, I saw isEqualToString from the apple documents too, but  
don't

understand why it isn't recognized


The error message makes it quite clear


* *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to
instance 0x147ee0*


... one of your "strings" is actually not a string at all.

b.bum

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Re: NSOperation cancellation

2009-05-26 Thread Thomas Engelmeier



Am May 26, 2009 um 1:07 AM schrieb Kyle Sluder:


On Mon, May 25, 2009 at 10:15 AM, Thomas Engelmeier
 wrote:

My op polls isCancelled, returns from main and nothing more happens.





Please post your code, it's the only real way to investigate the issue
(especially since you're using operations/multithreading, where the
errors can be extremely subtle).


You were right. Copy-pasting the relevant code revealed that doing a  
[delegate performSelectorOnMainThread] while the main thread is  
blocked waiting for the last operation to finish is not a good idea ;-)


Thanks,
Thomas
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Re: String Comparison and return values

2009-05-26 Thread John Ku

Oh so the very first return value from a Dictionary is not actually a
string?
NSString *itemA = [DictionaryA valueForKey:@"FirstProcessIdentifier"];

I've check the apple document, valueForKey returns an ID...  so it return an
object? how do I proceed?
If i cast it as NSString it gives me an error.

Thanks,
John

On Tue, May 26, 2009 at 12:48 AM, Bill Bumgarner  wrote:

> On May 26, 2009, at 12:46 AM, John Ku wrote:
>
>> Its weird, I saw isEqualToString from the apple documents too, but don't
>> understand why it isn't recognized
>>
>
> The error message makes it quite clear
>
>  * *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to
>> instance 0x147ee0*
>>
>
> ... one of your "strings" is actually not a string at all.
>
> b.bum
>
>
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Re: String Comparison and return values

2009-05-26 Thread Thomas Davie



Op 26 May 2009, om 09:56 heeft John Ku het volgende geschreven:


Oh so the very first return value from a Dictionary is not actually a
string?
NSString *itemA = [DictionaryA valueForKey:@"FirstProcessIdentifier"];

I've check the apple document, valueForKey returns an ID...  so it  
return an

object? how do I proceed?
If i cast it as NSString it gives me an error.


Simple - sort your type error out!  The dictionary contains at least  
one number.  This means that either you're creating it wrong, or  
you're trying to get values out of it wrong...


In the latter case you might want to try something like

id item = [dictionaryA valueForKey:@"FirstProcessIdentifier"];

if ([item isKindOfClass:[NSString class]])
{
// do stuff
}
else if ([item isKindOfClass:[NSNumber class]])
{
// do other stuff
}
...


Bob
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Re: String Comparison and return values

2009-05-26 Thread John Ku

That seems to make sense to use NSNumber instead of NSString, thanks it
works!

But I would think NSString would accept the return numbers as string and
compare them at the string level, it should work in theory no?  But NSNumber
- isEqualToNumber works great!

Thanks!
On Tue, May 26, 2009 at 12:57 AM, listsapple
wrote:

>
> I wonder if isEqualToNumber is what you need?
>
> bw
>
>
> On 26 May 2009, at 08:46, John Ku wrote:
>
> Its weird, I saw isEqualToString from the apple documents too, but don't
> understand why it isn't recognized
>
> On Tue, May 26, 2009 at 12:42 AM, John Ku  wrote:
>
> Thanks, but its giving me this error now:
>
>
> * *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to
>
> instance 0x147ee0*
>
>
>
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Re: String Comparison and return values

2009-05-26 Thread John Ku

Ahhh, that's a really great tip! Thanks!!Would come in really handy!

On Tue, May 26, 2009 at 1:04 AM, Thomas Davie  wrote:

>
> Op 26 May 2009, om 09:56 heeft John Ku het volgende geschreven:
>
>  Oh so the very first return value from a Dictionary is not actually a
>> string?
>> NSString *itemA = [DictionaryA valueForKey:@"FirstProcessIdentifier"];
>>
>> I've check the apple document, valueForKey returns an ID...  so it return
>> an
>> object? how do I proceed?
>> If i cast it as NSString it gives me an error.
>>
>
> Simple - sort your type error out!  The dictionary contains at least one
> number.  This means that either you're creating it wrong, or you're trying
> to get values out of it wrong...
>
> In the latter case you might want to try something like
>
> id item = [dictionaryA valueForKey:@"FirstProcessIdentifier"];
>
> if ([item isKindOfClass:[NSString class]])
> {
>// do stuff
> }
> else if ([item isKindOfClass:[NSNumber class]])
> {
>// do other stuff
> }
> ...
>
>
> Bob
>
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Re: String Comparison and return values

2009-05-26 Thread Jelle De Laender

A NSNumber has a 'stringValue' method, but I don't know why you want  
to compare them at String-level.


Jelle,

On 26 May 2009, at 10:07, John Ku wrote:

That seems to make sense to use NSNumber instead of NSString, thanks  
it

works!

But I would think NSString would accept the return numbers as string  
and
compare them at the string level, it should work in theory no?  But  
NSNumber

- isEqualToNumber works great!

Thanks!
On Tue, May 26, 2009 at 12:57 AM, listsapple
wrote:



I wonder if isEqualToNumber is what you need?

bw


On 26 May 2009, at 08:46, John Ku wrote:

Its weird, I saw isEqualToString from the apple documents too, but  
don't

understand why it isn't recognized

On Tue, May 26, 2009 at 12:42 AM, John Ku   
wrote:


Thanks, but its giving me this error now:


* *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to

instance 0x147ee0*




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Re: String Comparison and return values

2009-05-26 Thread John Ku

Yeah, it seems that the problem exist between chair and keyboard.
Just starting, so I thought I could use NSString for everything. :) Need to
pay attention to types more!

Thanks,

John

On Tue, May 26, 2009 at 1:10 AM, Jelle De Laender <
maill...@codingmammoth.com> wrote:

> A NSNumber has a 'stringValue' method, but I don't know why you want to
> compare them at String-level.
>
> Jelle,
>
>
> On 26 May 2009, at 10:07, John Ku wrote:
>
>  That seems to make sense to use NSNumber instead of NSString, thanks it
>> works!
>>
>> But I would think NSString would accept the return numbers as string and
>> compare them at the string level, it should work in theory no?  But
>> NSNumber
>> - isEqualToNumber works great!
>>
>> Thanks!
>> On Tue, May 26, 2009 at 12:57 AM, listsapple
>> wrote:
>>
>>
>>> I wonder if isEqualToNumber is what you need?
>>>
>>> bw
>>>
>>>
>>> On 26 May 2009, at 08:46, John Ku wrote:
>>>
>>> Its weird, I saw isEqualToString from the apple documents too, but don't
>>> understand why it isn't recognized
>>>
>>> On Tue, May 26, 2009 at 12:42 AM, John Ku  wrote:
>>>
>>> Thanks, but its giving me this error now:
>>>
>>>
>>> * *** -[NSCFNumber isEqualToString:]: unrecognized selector sent to
>>>
>>> instance 0x147ee0*
>>>
>>>
>>>
>>>  ___
>>
>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
>>
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>>
>
>
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Re: [announce] A Core Data tutorial

2009-05-26 Thread Mic Pringle

Hi Mike,

I really enjoyed reading this article. Any ideas on when part 2 will
be available ?

Cheers

-Mic

2009/5/22 Michael Swan :
> Just finished the first in a series of tutorials that takes a Core Data app
> from beginning to end including things like icons, and serial numbers.
>
> http://themikeswan.wordpress.com/2009/05/22/7/
>
> Feel free to let me know what you think. Also there is one feature I want to
> add later that I have not figured out how to do yet so if anyone is
> interested in contributing a bit let me know (I will of course make sure you
> get credit).
>
> Thanks,
> Mike Swan
> ETCP Certified Entertainment Electrician
> http://www.michaelsswan.com
>
> "Every experience in your life is an opportunity to learn something new and
> to make a change for your ultimate benefit."
>
>
>
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Re: How to use CFReadStrem and abort read stream normally?

2009-05-26 Thread Peter Blazejewicz

Hello Chris,

On May 22, 2009, at 5:10 AM, Chris Gardner wrote:

Hi,
I have already read through CFReadStream archives, and still have
trouble with it.
After CFReadStreamOpen() has been implement and its status is
kCFStreamEventHasBytesAvailable,
so I can read data from the source.Of course, there's no problem. As
for the FTP server,

I can connect it by using CFReadStreamCreateWithFTPURL.
Now, I would like to abort/disconnect the read stream when its
status is kCFStreamEventHasBytesAvailable.

At that time. I will use CFReadStreamClose() and CFRunLoopStop().
As you know, the read stream was availabe in a run loop
where data stream can tranfer from FTP server to destination.
However, I met a terrible problem which show GDB:Program received
signal:"EXC_BAD_ACCESS" as soon as I do above operation,
also I see the read stream's status become
kCFStreamEventErrorOccurred.
So my question is...How can I avoid this error and how can I abort
the read stream normally

when its status is kCFStreamEventHasBytesAvailable.
Your help will be appreciated.
Best Regards.
Chris Wu

have you tried using routine described in docs (unschedule from run
loop and close stream)?
http://developer.apple.com/documentation/Networking/Conceptual/CFNetwork/CFStreamTasks/CFStreamTasks.html#/
/apple_ref/doc/uid/TP3230-62233

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