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copied!<p>I think you don't need to use <code>objc.selector</code> at all; try this instead:</p> <pre><code>@objc.IBAction def ShowOpenPanel_(self, sender): self.panel = NSOpenPanel.openPanel() self.panel.setCanChooseFiles_(False) self.panel.setCanChooseDirectories_(True) NSLog(u'Starting OpenPanel') self.panel.beginForDirectory_file_types_modelessDelegate_didEndSelector_contextInfo_( self.defaults.objectForKey_(u'projpath'), objc.nil, objc.nil, self, self.OpenPanelDidEnd_returnCode_contextInfo_, objc.nil) NSLog(u'OpenPanel was started.') </code></pre> <p>I've also found that I need to decorate the end-of-panel function with <code>PyObjCTools.AppHelper.endSheetMethod</code>:</p> <pre><code>@PyObjCTools.AppHelper.endSheetMethod def OpenPanelDidEnd_returnCode_contextInfo_(self, panel, returnCode, context): NSLog('Panel ended.') if (returnCode == NSOKButton): NSLog(u'User selected OK') path = self.panel.filenames()[0] self.defaults.setObject_forKey_(path, u'projpath') del self.panel </code></pre> <p>Here's how I would write what you have:</p> <pre><code>@objc.IBAction def showOpenPanel_(self, sender): panel = NSOpenPanel.openPanel() panel.setCanChooseFiles_(False) panel.setCanChooseDirectories_(True) NSLog(u'Starting openPanel') panel.beginForDirectory_file_types_modelessDelegate_didEndSelector_contextInfo_( self.defaults.objectForKey_(u'projpath'), #forDirectory None, #file None, #types self, #modelessDelegate self.openPanelDidEnd_returnCode_contextInfo_, #didEndSelector None) #contextInfo NSLog(u'openPanel started') @PyObjCTools.AppHelper.endSheetMethod def openPanelDidEnd_returnCode_contextInfo_(self, panel, returnCode, context): NSLog(u'Panel ended') if returnCode != NSOKButton: return NSLog(u'User selected OK') path = panel.filenames()[0] self.defaults.setObject_forKey_(path, u'projpath') </code></pre> <p>Explanation of changes: I always use <code>None</code> rather than <code>objc.nil</code> and it hasn't messed me up yet; I don't think your panel needs to be a property of <code>self</code> since you get it in your return function; objc convention is to have the first letter of your function in lower case.</p>

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