[Pyobjc-dev] Using NSURLConnection

[David R. <da...@it...>]

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I've tried to use NSURLConnection to load a resource from a URL, but 
very strange things happen when the framework tries to call my 
delegate. This is some code from my project:

     def startReadingFromURL( self, url ):
         self.waitingForDataFromURL = True
         nsurl = NSURL.URLWithString_(url)
         request = NSURLRequest.requestWithURL_(nsurl)
         connection = NSURLConnection.connectionWithRequest_delegate_( 
request, self )

     def connection_didReceiveData_(self, connection, data):
         print str(data)

When this runs, the program crashes just as it is supposed to call 
connection_didReceiveData_. The backtrace is a stack overflow due to 
recursion, and it looks like this:

0   libobjc.A.dylib          	0x90835cd0 -[Protocol 
descriptionForInstanceMethod:] + 0x10
1   com.apple.Foundation     	0x909fe5a0 
_NSMethodDescriptionForSelector + 0x84
2   com.apple.Foundation     	0x90a491e0 -[NSInvocationBuilder 
forward::] + 0x38
3   libobjc.A.dylib          	0x90836810 _objc_msgForward + 0xb0
4   com.apple.Foundation     	0x90a4db88 -[NSProxy respondsToSelector:] 
+ 0x50
5   _objc.so                 	0x002836c0 -[OC_PythonObject 
respondsToSelector:] + 0x40
6   com.apple.Foundation     	0x909fafec _NSDescriptionWithLocaleFunc + 
0x48
7   com.apple.CoreFoundation 	0x9019ed9c 
_CFStringAppendFormatAndArgumentsAux + 0xfdc
8   com.apple.CoreFoundation 	0x901a4b04 
_CFStringCreateWithFormatAndArgumentsAux + 0x90
9   com.apple.Foundation     	0x90a50bd4 +[NSException 
raise:format:arguments:] + 0x5c
10  com.apple.Foundation     	0x90a5cd5c +[NSException raise:format:] + 
0x2c
11  _objc.so                 	0x00283c08 -[OC_PythonObject 
forwardInvocation:] + 0x1e0
12  com.apple.Foundation     	0x90a4dbb0 -[NSProxy respondsToSelector:] 
+ 0x78
13  _objc.so                 	0x002836c0 -[OC_PythonObject 
respondsToSelector:] + 0x40
...
...
...
502 com.apple.Foundation     	0x909fafec _NSDescriptionWithLocaleFunc + 
0x48
503 com.apple.CoreFoundation 	0x9019ed9c 
_CFStringAppendFormatAndArgumentsAux + 0xfdc
504 com.apple.CoreFoundation 	0x901a4b04 
_CFStringCreateWithFormatAndArgumentsAux + 0x90
505 com.apple.Foundation     	0x90a50bd4 +[NSException 
raise:format:arguments:] + 0x5c
506 com.apple.Foundation     	0x90a5cd5c +[NSException raise:format:] + 
0x2c
507 _objc.so                 	0x00283c08 -[OC_PythonObject 
forwardInvocation:] + 0x1e0
508 com.apple.Foundation     	0x90a4dbb0 -[NSProxy respondsToSelector:] 
+ 0x78

I don't know what to do to make this work. Callbacks in general have 
proven slightly shaky for me -- I think I have missed some critical 
information.

/ Regards, David Remahl

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pub  1024D/ 87256085 2003/06/12 David Remahl <da...@re...>
Web: http://ittpoi.com/david_remahl.asc
Fingerprint: 0C38 293C 86A9 7756 9CEA  4ED6 1651 620E 8725 6085
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