Remove all saved USB drive letter assignments

Question

Let me explain, I have a UIViewController in a thread n.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myCommandNotification:) name:NetConnection object:nil];

I have an other Class in thread n +1 and i post a message.

[[NSNotificationCenter defaultCenter] postNotificationName:myCommandNotification: object:MyObject];

Ok so far no problem I'm happy lol.

Well, yes there is problem for later.

now when i try to use

SEL selector = NSSelectorFromString([NSString stringWithFormat:@"%@:", myCommandNotification]); 

if ([[NSNotificationCenter defaultCenter] respondsToSelector:selector])

The return code is always NO.

When i use

if ([MyViewController self] respondsToSelector:selector])

it's work

I'm stupid or not ?!!

Many Thanks

Solution

get yourself a copy of usbdview shows all assigned usb devices, including drive letters. delete away

Comments

[rmaddy]

Why are you checking if the NSNotificationCenter responds to the selector? It's your first class that has the method. BTW - what is a "treat" in this context? Looks like a translation error.

[Alan10977]

No no, i have multiple UIViewContorller and when exit a vc i use in dealoc remove observer and i have one session for my App

[Alan10977]

And all task download are assync

[Alan10977]

if you don't understand what is a treat tread, You can not help me..

[rmaddy]

Do you mean "thread"? As in "multi-threaded"?

[Alan10977]

yes i mean Thread excuse me

[Alan10977]

Do not careful with names just a sample

[Alan10977]

No, when you create a NSNotification with object is nil you can post any object.

[Avi Tsadok]

Imaging the notification centre is an object that has an array/dictionary of objects and selectors linked to a notification name. When you tell the notification centre to POST notification (by name), it search this list, and when it finds an object that linked to this notification name, it fires it's method. Thats it. Is that clear?

[Avi Tsadok]

Responses to selector means the object has this method and can execute it. In this case the notification centre doesn't have this method, It just knows what objects listen to this notification and execute THIER methods. Thats it

[Alan10977]

Post 1 ok for me, but the point 2 i don't really a response for SEL selector = NSSelectorFromString([NSString stringWithFormat:@"%@:", myCommandNotification]); if ([[NSNotificationCenter defaultCenter] respondsToSelector:selector] not work

[Alan10977]

If i understod defaultcenter retain the name and not the selector it' t right ?

[Alan10977]

I use UIViewController self for my ResponseToSelector and that work without problem. Many tanks. I understood now, it's impossible with defaultcenter to have with their design.

[Avi Tsadok]

If you understand, you can always mark my answe... :)