pyobjc-dev

[Pyobjc-dev] objc.error: No forwarder for signature @@

[Steven D. A. <st...@ne...>]

When trying to do a simple program, I discovered the following error, which
I entered line for line in the python interpreter.

>>> import sys
>>> import os.path
>>> sys.path.insert(0, os.p>>> >>> >>> ath.join(sys.path[0], "pyobjc"))
>>> import objc
>>> import Foundation
>>> import AppKit
>>> class HelloWorld(Foundation.NSObject):
...     def sayIt():
...         self.text = "Hello World"
... 
No IMP for signature @@
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
objc.error: No forwarder for signature @@

I tracked this down to the quoted text being the problem.  If the sayIt()
function doesn't include quoted text (either single- or double-quotes), the
program doesn't raise an exception like this.

I am using the CVS version of the software, downloaded a few days ago.
-- 

Re: [Pyobjc-dev] objc.error: No forwarder for signature @@

[Ronald O. <ous...@ci...>]

The message is not very usefull, but there is a problem with your code.  
The
following version does work:

class HelloWorld (Foundation.NSObject):
	def sayIt(self):
		self.text = "Hello world"

Note the 'self' argument for sayIt. You have to specify a self argument  
for all method definitions.

Ronald

On Thursday, Oct 24, 2002, at 07:52 Europe/Amsterdam, Steven D. Arnold  
wrote:

> When trying to do a simple program, I discovered the following error,  
> which
> I entered line for line in the python interpreter.
>
>>>> import sys
>>>> import os.path
>>>> sys.path.insert(0, os.p>>> >>> >>> ath.join(sys.path[0], "pyobjc"))
>>>> import objc
>>>> import Foundation
>>>> import AppKit
>>>> class HelloWorld(Foundation.NSObject):
> ...     def sayIt():
> ...         self.text = "Hello World"
> ...
> No IMP for signature @@
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> objc.error: No forwarder for signature @@
>
> I tracked this down to the quoted text being the problem.  If the  
> sayIt()
> function doesn't include quoted text (either single- or  
> double-quotes), the
> program doesn't raise an exception like this.
>
> I am using the CVS version of the software, downloaded a few days ago.
> --  
>
>
>
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