Comments on: Mixing Cocoa and Qt

By: Ravi

Ravi — Wed, 14 Jul 2010 08:39:57 +0000

Thanks
for quick info.

By: Remko Tronçon

Remko Tronçon — Wed, 14 Jul 2010 06:53:49 +0000

@Ravi No, AFAIK Sparkle only has a Mac OS X version. And more importantly, this post is about Cocoa, which isn’t used on Symbian.

By: Ravi

Ravi — Wed, 14 Jul 2010 06:48:41 +0000

Hi,
I want to know can I use the same code for symbian S 60 based device for updating application?

Thanks

By: Martin

Martin — Fri, 26 Mar 2010 13:04:54 +0000

Finally got everything working and it s great.
Now i face one last problem. is there a way to tell the AutoUpdater to use another language?
My Qt application can be in multiple language not related to the system language. But the AutoUpdater is always in English and i dont know how to change it.

Thanks

By: Martin

Martin — Thu, 25 Mar 2010 16:39:02 +0000

EDIT: GOT IT!!!!! didnt see that the checkForUpdates function needed an argument
Sorry for the trouble

By: Martin

Martin — Thu, 25 Mar 2010 16:34:08 +0000

Hi Remko,

First thanks for your post as it helped me a lot!
But i have a big problem with it.
In your example you use checkForUpdatesInBackground which works great.
Now if you try to use checkForUpdates(because you want the checking gui) then you get a crash every time! I use QT for Cocoa. Happens on 4.6, 4.6.2 and 4.7.0.preview

2010-03-25 17:30:15.046 mixing-cocoa-and-qt[66080:903] -[SUUpdater checkForUpdates]: unrecognized selector sent to instance 0×1011ad970
2010-03-25 17:30:15.048 mixing-cocoa-and-qt[66080:903] An uncaught exception was raised
2010-03-25 17:30:15.076 mixing-cocoa-and-qt[66080:903] -[SUUpdater checkForUpdates]: unrecognized selector sent to instance 0×1011ad970
2010-03-25 17:30:15.134 mixing-cocoa-and-qt[66080:903] *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[SUUpdater checkForUpdates]: unrecognized selector sent to instance 0×1011ad970′
*** Call stack at first throw:
(
0 CoreFoundation 0×00007fff80283444 __exceptionPreprocess + 180
1 libobjc.A.dylib 0×00007fff857d10f3 objc_exception_throw + 45
2 CoreFoundation 0×00007fff802dc1c0 +[NSObject(NSObject) doesNotRecognizeSelector:] + 0
3 CoreFoundation 0×00007fff8025608f ___forwarding___ + 751
4 CoreFoundation 0×00007fff802521d8 _CF_forwarding_prep_0 + 232
5 mixing-cocoa-and-qt 0×000000010000546b main + 251
6 mixing-cocoa-and-qt 0×0000000100004b32 _start + 224
7 mixing-cocoa-and-qt 0×0000000100004a51 start + 33
8 ??? 0×0000000000000001 0×0 + 1
)
terminate called after throwing an instance of ‘NSException’
The program has unexpectedly finished.

Any help?

By: Remko Tronçon

Remko Tronçon — Sun, 17 Jan 2010 20:57:03 +0000

@Michael I haven’t, but Psi’s latest release has webcam support in it, and it’s Qt based. It does use GStreamer though, which probably is more pain than you want.

By: Michael

Michael — Sun, 17 Jan 2010 18:44:45 +0000

Thank you for such a quick and useful response, adding that framework works a treat

I don’t suppose you’ve ever tried to integrate a webcam into a Qt application have you? I don’t expect you to have, but it would save me an awful lot of time!

Thanks again,
Michael

By: Remko Tronçon

Remko Tronçon — Sun, 17 Jan 2010 16:32:20 +0000

@Michael I check every thread on my blog all the time (or at least, have e-mails telling me someone said something

It seems my QMake .pro file was missing a framework: just add “-framework AppKit” to the LIBS varable. The sources should be fixed now.

By: Michael

Michael — Sun, 17 Jan 2010 01:05:50 +0000

I don’t suppose you’re still checking this thread, Remko, but if you are I am trying to do something very similar. I am trying to display a live video feed in a Qt application from a webcam connected to the computer (which is a Mac). It seems so me that the QTKit capture api is the best way to do this but I am struggling to get anything to work, including your demo. Whether it’s a problem with Qt 4.6 I’m not sure. The errors I get with my own code look like they’re caused by the same problem… whatever it is. Any help would be greatly appreciated.

The pastie link below has the output when trying to compile your source as is. The sparkle framework is in place and is found by the compiler so it’s not that…

http://pastie.org/781365

any ideas?
Michael