我想为我正在设计的应用程序使用 NSOpenPanel。这是我到目前为止所拥有的:
@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,
objc.selector(self.OpenPanelDidEnd_returnCode_contextInfo_,
signature='v:@ii'),
objc.nil)
NSLog(u'OpenPanel was started.')
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
我关心的主要两行是:
objc.selector(self.OpenPanelDidEnd_returnCode_contextInfo_,
signature='v:@ii'),
objc.nil) #this is the argument that gets passed as the void pointer
第三个参数应该是一个空指针。由于我不打算使用该数据,因此我宁愿将其留空。我尝试过制作签名'v:@iv'
并尝试使用objc.NULL
和 python'sNone
以及所有这些东西的几乎所有组合。处理这个问题的最佳方法是什么?