pyobjc-dev

[Pyobjc-dev] objc.BadPrototypeError

[Rob <rob...@gm...>]

(Please tell me if this is the wrong list for this kind of thing)

I am trying to port an application written against the stock python+pyobjc
on Leopard to one on snow leopard, and I've hit and error I can't solve.  I
have a sheet that pops in that allows one to select files, and it does this:

self.panel.beginSheetForDirectory_file_types_modalForWindow_modalDelegate_didEndSelector_contextInfo_(
            os.getcwd(),
            None,
            self.filetypes,
            NSApp().mainWindow(),
            self,
            'openPanelDidEnd:panel:returnCode:contextInfo:',
            0)

the key being the 'openPanelDidEnd:panel:returnCode:contextInfo:' part.

The signature of that method seems to have changed between Leopard and Snow
Leopard, but the decorator in pyobjc doesn't appear updated.  I am guess
this is what is going on because my method defined as:

@PyObjCTools.AppHelper.endSheetMethod
def openPanelDidEnd_panel_returnCode_contextInfo_(self, panel, returnCode,
contextInfo):

(which works fine in Leopard) throws the error:

objc.BadPrototypeError: Python signature doesn't match implied Objective-C
signature for <unbound selector
openPanelDidEnd:panel:returnCode:contextInfo: of desktop_uploaderAppDelegate
at 0x2fb6d70>

I've tried to figure out how to write the signature myself, but I seem to
suck badly at doing so. Nothing I have tried has worked.  I've tried (some
were just googled, some I tired to write myself by looking at the apple
docs):

@objc.signature('v@:^@i^v')
@objc.signature('v16@4:8@12i16i20')
@objc.signature('v@:@i^v')

amongst others, but everything I try just throws
that objc.BadPrototypeError: and crashes the program.

Seems like it should be an easy fix if I could sort out the signature - can
anyone help or point me in the right direction?

cheers,
rob

-- 
http://robrohan.com
http://twitter.com/robrohan

Re: [Pyobjc-dev] objc.BadPrototypeError

[Ronald O. <ron...@ma...>]

(mobilme webmail seems to mess up quoting, hence my toppost).

The callback method should be named 'openPanelDidEnd:returnCode:contextInfo:', (that is "openPanelDidEnd_returnCode_contextInfo_". The name your using contains 4 underscores, and should therefore have 5 arguments (including 'self'), while the sheet expects a method with 3 arguments.

Ronald

On Friday, November 13, 2009, at 07:14AM, "Rob" <rob...@gm...> wrote:
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Re: [Pyobjc-dev] objc.BadPrototypeError

[Rob <rob...@gm...>]

It took me a few minutes to get what you were saying, but you are right.
Your comment did get me sorted.

The code I initially used was listed on numerous blogs as an example of how
to do the sheet, so just so others searching on this find
a conclusive answer:

This method signature is correct:

@PyObjCTools.AppHelper.endSheetMethod
def openPanelDidEnd_returnCode_contextInfo_(self, panel, returnCode,
contextInfo):

However "hooking up the callback" (or whatever the proper term is) like
this:

'openPanelDidEnd:panel:returnCode:contextInfo:'

is incorrect, because there are too many parameters.  Setting up the
callback with 4 parameters works in Leopard, but it does not in Snow Leopard
for some reason (probably because it's wrong).

Using the call back of:

'openPanelDidEnd:returnCode:contextInfo:'

Makes joy.  And to do some ascii art to solidify what Ronald was saying

'openPanelDidEnd:returnCode:contextInfo:'
                          ^                ^               ^
                          1                2              3

openPanelDidEnd_returnCode_contextInfo_(self, panel, returnCode,
contextInfo):
                                                                          ^
            ^                ^
                                                                          1
            2                3


Thanks again Ronald
rob



On Fri, Nov 13, 2009 at 11:28 PM, Ronald Oussoren <ron...@ma...>wrote:

>  (mobilme webmail seems to mess up quoting, hence my toppost).
>
> The callback method should be named 'openPanelDidEnd:returnCode:contextInfo:', (that is "openPanelDidEnd_returnCode_contextInfo_". The name your using contains 4 underscores, and should therefore have 5 arguments (including 'self'), while the sheet expects a method with 3 arguments.
>
> Ronald
>
> On Friday, November 13, 2009, at 07:14AM, "Rob" <rob...@gm...> wrote:
> >------------------------------------------------------------------------------
> >Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> >trial. Simplify your report design, integration and deployment - and focus on
> >what you do best, core application coding. Discover what's new with
> >Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> >_______________________________________________
> >Pyobjc-dev mailing list
> >Pyo...@li...
> >https://lists.sourceforge.net/lists/listinfo/pyobjc-dev
> >
> >
>
>  (Please tell me if this is the wrong list for this kind of thing)
>
> I am trying to port an application written against the stock python+pyobjc
> on Leopard to one on snow leopard, and I've hit and error I can't solve.  I
> have a sheet that pops in that allows one to select files, and it does this:
>
>
> self.panel.beginSheetForDirectory_file_types_modalForWindow_modalDelegate_didEndSelector_contextInfo_(
>             os.getcwd(),
>             None,
>             self.filetypes,
>             NSApp().mainWindow(),
>             self,
>             'openPanelDidEnd:panel:returnCode:contextInfo:',
>             0)
>
>  the key being the 'openPanelDidEnd:panel:returnCode:contextInfo:' part.
>
>  The signature of that method seems to have changed between Leopard and
> Snow Leopard, but the decorator in pyobjc doesn't appear updated.  I am
> guess this is what is going on because my method defined as:
>
>  @PyObjCTools.AppHelper.endSheetMethod
> def openPanelDidEnd_panel_returnCode_contextInfo_(self, panel, returnCode,
> contextInfo):
>
>  (which works fine in Leopard) throws the error:
>
>  objc.BadPrototypeError: Python signature doesn't match implied
> Objective-C signature for <unbound selector
> openPanelDidEnd:panel:returnCode:contextInfo: of desktop_uploaderAppDelegate
> at 0x2fb6d70>
>
>  I've tried to figure out how to write the signature myself, but I seem to
> suck badly at doing so. Nothing I have tried has worked.  I've tried (some
> were just googled, some I tired to write myself by looking at the apple
> docs):
>
>  @objc.signature('v@:^@i^v')
> @objc.signature('v16@4:8@12i16i20')
> @objc.signature('v@:@i^v')
>
>  amongst others, but everything I try just throws
> that objc.BadPrototypeError: and crashes the program.
>
>  Seems like it should be an easy fix if I could sort out the signature -
> can anyone help or point me in the right direction?
>
>  cheers,
> rob
>
>  --
> http://robrohan.com
> http://twitter.com/robrohan
>



-- 
http://robrohan.com
http://twitter.com/robrohan