How to get the application object?
-
Hi folks,
When creating a new Cocoa project on Mac OS X Beta, PB creates the
NSApplication object like this in the main function:
return NSApplicationMain(argc, argv);
But this give me no chance at all to access the NSApplication object.
In the Apple documentation it is written that the function
NSApplicationMain look about like this:
void NSApplicationMain(int argc, char *argv[]) {
[NSApplication sharedApplication];
[NSBundle loadNibNamed:@"myMain" owner:app];
[NSApp run];
}
But where is the returned value for the main function? And what to do
with the arguments? I want to replace my "return
NSApplicationMain(argc, argv);" so I can get the NSApplication object
and set my windows.
Could you tell me how to access this object?
Regards.
Tib. -
NSApp is a global variable of type (NSApplication *), defined somewhere in the AppKit. This is what you need.
Raphael -
> NSApp is a global variable of type (NSApplication *), defined somewhere in the
> AppKit. This is what you need.
Also, [NSApplication sharedApplication] can be called again later (in your
controller / application delegate, for example) to return your NSApplication
instance.>> I want to replace my "return NSApplicationMain(argc, argv);" so I can get the
>> NSApplication object and set my windows.
This sounds like you might actually be looking for something else; what are
you trying to do? If you're trying to do initial setup of your UI and
windows, that should be done in your controller class(es). Depending on what
you need to setup, you'll probably want to do it in -awakeFromNib, though a
few things you might have to wait until -applicationWillFinishLaunching or
-applicationDidFinishLaunching for.
--
Rick Roe
Webmeister & Icon Dude
http://www.icons.cx/ -
RTFM:
http://devworld.apple.com/techpubs/webobjects/WebObjects_3.5/Reference/Fram
e
works/ObjC/Foundation/Classes/NSProcessInfo/NSProcessInfo.html
See the -arguments method. -
Pick any class in your app.
In it's init method do
[NSApp setDelegate:self];
add the -application(will/should) methods to that class.
You are done.
No IB or special equipment required.
This is in the docs (and I believe it's also in the TextEdit application,
though i could be wrong).
Of course, you will most likely wish to choose your main controller object
as the implementer of these methods, there is no requirement to do so.
Eric
On Fri, 26 Jan 2001, Todd Blanchard wrote:> <fontfamily><param>Helvetica</param>
>
> I certainly understand his dilemma. I struggled with this just last night. The problem is that there is no good hook that I can find in the api for setting up your application delegate to handle applicationWillFinishLaunching in the first place.
>
>
> Instead, it looks like you have to use IB to create a delegate class and set it up on the application. If you're not familiar with IB (and I'm not very - its a really unintuitive tool) then its going to take awhile to figure out how to do that.
>
>
> I still haven't quite made it work.
>
>
> On Friday, January 26, 2001, at 01:26 AM, Rick Roe wrote:
>
> <color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>Also, [NSApplication sharedApplication] can be called again later (in your</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>controller / application delegate, for example) to return your NSApplication</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>instance.</italic><color><param>0000,0000,0000</param>
>
>
> <italic></italic></color><italic>>> I want to replace my "return NSApplicationMain(argc, argv);" so I can get the</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>>> NSApplication object and set my windows.</italic><color><param>0000,0000,0000</param>
>
>
> <italic></italic></color><italic>This sounds like you might actually be looking for something else; what are</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>you trying to do? If you're trying to do initial setup of your UI and</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>windows, that should be done in your controller class(es). Depending on what</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>you need to setup, you'll probably want to do it in -awakeFromNib, though a</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>few things you might have to wait until -applicationWillFinishLaunching or</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>-applicationDidFinishLaunching for.</italic><color><param>0000,0000,0000</param>
>
>
> <italic></italic></color><italic>-- </italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>Rick Roe</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic> Webmeister & Icon Dude</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic> http://www.icons.cx/</italic><color><param>0000,0000,0000</param>
>
>
> <italic></italic></color><italic>_______________________________________________</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>MacOSX-dev mailing list</italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic><MacOSX-dev...></italic><color><param>0000,0000,0000</param>
>
> <italic></italic></color><italic>http://www.omnigroup.com/mailman/listinfo/macosx-dev</italic><color><param>0000,0000,0000</param>
>
> </color>
>
> <flushleft><x-tabstops><param>72L;144L;216L;288L;360L;</param>
>
> ---<color><param>CBCB,1818,3838</param>
>
> Todd Blanchard</color>
>
> Enterprise Systems Architect
>
> Cacheon, Inc. http://www.cacheon.com
>
> (415) 856-1144</x-tabstops></flushleft>_______________________________________________
> MacOSX-dev mailing list
> <MacOSX-dev...>
> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>
--
Eric Peyton
<epeyton...>
Software and Source for Mac OS X -
> I certainly understand his dilemma. I struggled with this just last
> night. The problem is that there is no good hook that I can find in
> the api for setting up your application delegate to handle
> applicationWillFinishLaunching in the first place.
>
Yes, this is the problem. I have no hook!
At 12:24 -0600 26/01/01, Eric Peyton wrote:> Pick any class in your app.
>
> In it's init method do
>
> [NSApp setDelegate:self];
Ok this is the solution! Now I would like to know which methods the
delegate is in the obligation to implement. I read the documentation
about NSApplication and it is not clear which methods is optional and
which methods is not. Where is the documentation telling that?
Thank you all for your help!
Tib. -
They are all optional. That's the beauty of delegation. If a class
requires you to implement one or more of them, as a general rule appkit
will tell you so either a) in the docs or b) when you run the
app and don't have them all hooked up. Always pay attention to the
console ...
Eric
On Fri, 26 Jan 2001, Pierre
Thibault wrote:>> I certainly understand his dilemma. I struggled with this just last
>> night. The problem is that there is no good hook that I can find in
>> the api for setting up your application delegate to handle
>> applicationWillFinishLaunching in the first place.
>>
>
> Yes, this is the problem. I have no hook!
>
> At 12:24 -0600 26/01/01, Eric Peyton wrote:
>> Pick any class in your app.
>>
>> In it's init method do
>>
>> [NSApp setDelegate:self];
>
> Ok this is the solution! Now I would like to know which methods the
> delegate is in the obligation to implement. I read the documentation
> about NSApplication and it is not clear which methods is optional and
> which methods is not. Where is the documentation telling that?
>
> Thank you all for your help!
>
> Tib.
> _______________________________________________
> MacOSX-dev mailing list
> <MacOSX-dev...>
> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>
--
Eric Peyton
<epeyton...>
Software and Source for Mac OS X -
On Friday, January 26, 2001, at 07:53 PM, Pierre Thibault wrote:> At 12:24 -0600 26/01/01, Eric Peyton wrote:
>> Pick any class in your app.
>>
>> In it's init method do
>>
>> [NSApp setDelegate:self];
>
> Ok this is the solution! Now I would like to know which methods the
> delegate is in the obligation to implement. I read the documentation
> about NSApplication and it is not clear which methods is optional and
> which methods is not. Where is the documentation telling that?
Everything is optional (just like with every other delegate).
andy
--
We fucked up. We fucked up big time.
-- Steve Jobs -
On Fri, 26 Jan 2001, Eric Peyton wrote:> Pick any class in your app.
>
> In it's init method do
>
> [NSApp setDelegate:self];
>
> add the -application(will/should) methods to that class.
>
> You are done.
>
> No IB or special equipment required.
>
How exactly does the Application check if the Delegate implements
a particular method ? -respondsToSelector: ?
Delegate objects in Python that define the appropriate methods
don't get called, as there is a NSProxy bridging python objects
and objc objects. The proxy object itself does not implement
applicationDidFinishLaunching et.al. , so the python objects
that *do* implement them don't get called.
I can think of two solutions:
Implement stubs for all of the delegate methods in the proxy
class, and when they get called, have the proxy check if there
is a python implementation.
Have the proxy's respondToSelector: query it's python object.
Maybe there are others.
What is the "Right" way?
What does the java bridge do ?
-- Steve Majewski <sdm7g...> -
On Fri, 26 Jan 2001, Eric Peyton wrote:>> How exactly does the Application check if the Delegate implements
>> a particular method ? -respondsToSelector: ?
>
> Yep.
Thanks.>
> No clue about the rest ofg your message.
>
> Eric
>
Well -- to try to be more concise and omit the python specific stuff:
There's a NSProxy sitting between my NSApplication and it's delegate.
The delegate methods don't get called, I assume, because they aren't
actually implemented by the proxy.
Which is the best lie to instruct my proxy to tell to make proxied
delegates work properly?
-- Steve Majewski -
On Friday, January 26, 2001, at 10:03 PM, Steven D. Majewski wrote:> On Fri, 26 Jan 2001, Eric Peyton wrote:
>
>>> How exactly does the Application check if the Delegate implements
>>> a particular method ? -respondsToSelector: ?
> There's a NSProxy sitting between my NSApplication and it's delegate.
>
> The delegate methods don't get called, I assume, because they aren't
> actually implemented by the proxy.
>
> Which is the best lie to instruct my proxy to tell to make proxied
> delegates work properly?
Isn't it obvious to override respondsToSelector:?
Maybe you should read Apple's ObjC documentation, there's an example how to handle that.
file:/Developer/Documentation/Cocoa/ObjectiveC/ObjC.pdf, starting at page 144
andy
--
Description forthcoming. -
On Fri, 26 Jan 2001, Andreas Monitzer wrote:> Isn't it obvious to override respondsToSelector:?
That was my guess, but some of the comments in the NSObject protocol
docs caused me to think that perhaps that wasn't the appropriate lie.> Maybe you should read Apple's ObjC documentation, there's an example
> how to handle that.
> file:/Developer/Documentation/Cocoa/ObjectiveC/ObjC.pdf, starting at
> page 144
That's more clear but still equivocal: it gives an example where
respondsToSelector: says NO, even though it can forward and handle
the message and, after stressing the distinction between inheritance
and forwarding, then says there are times where you might want to
lie about it in respondsToSelector: and isKindOfClass: .
( OK: The doc's never use the word "lie" , but it was it's stressing
the distinction that made that characterization come to mind! )
Since I can think of more than one way to lie about it, I was
wondering which lie was less likely to cause other problems.
In other words: The docs make it clear what I *can* do -- what
wasn't clear was what I *should* do.
-- Steve Majewski
