崩潰_class_getName在applicationOpenUntitledFile

我有這樣的代碼：崩潰_class_getName在applicationOpenUntitledFile

from AppKit import * 

def setupWindow(): 
    w = NSWindow.alloc() 
    w.initWithContentRect_styleMask_backing_defer_(
     ((200.0, 200.0), (250.0, 100.0)), 
     NSTitledWindowMask | 
     NSClosableWindowMask | 
     NSResizableWindowMask, 
     NSBackingStoreBuffered, False) 
    w.setTitle_("Hello world") 

    w.display() 
    w.orderFrontRegardless() 
    w.makeMainWindow() 

    app.delegate().mainWindow = w 

    return w 

class PyAppDelegate(NSObject): 

    def applicationOpenUntitledFile_(self, app): 
     print "applicationOpenUntitledFile_", app 
     print "delegate:", app.delegate() 
     print self.__class__ 
     setupWindow() 

app = NSApplication.sharedApplication() 
appDelegate = PyAppDelegate.alloc().init() 
app.setDelegate_(appDelegate) 
app.finishLaunching() 
app.run()

當我點擊了碼頭，沒有窗口打開，我得到這樣的輸出：

applicationOpenUntitledFile_ <NSApplication: 0x7fbb57e10bb0> 
delegate: <PyAppDelegate: 0x7fbb5770c0f0> 
<objective-c class PyAppDelegate at 0x7fbb57e05c30> 
fish: Job 1, '../main.py ' terminated by signal SIGSEGV (Address boundary error)

隨着這一崩潰：

Crashed Thread: 0 Dispatch queue: com.apple.main-thread 

Exception Type: EXC_BAD_ACCESS (SIGSEGV) 
Exception Codes: EXC_I386_GPFLT 

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 
0 libobjc.A.dylib     0x00007fff9474acbc _class_getName + 13 
1 _objc.so      0x0000000109fda3a2 0x109fb7000 + 144290 
2 org.python.python    0x0000000109d074e7 0x109c67000 + 656615 
3 org.python.python    0x0000000109cd10b7 0x109c67000 + 434359 
4 org.python.python    0x0000000109cd0f10 PyDict_SetItem + 145 
5 _objc.so      0x0000000109fdaba1 0x109fb7000 + 146337 
6 org.python.python    0x0000000109cdae38 PyObject_SetAttr + 157 
7 org.python.python    0x0000000109c7f78d PyEval_EvalFrameEx + 5632 
8 org.python.python    0x0000000109c84869 0x109c67000 + 120937 
9 org.python.python    0x0000000109c8063a PyEval_EvalFrameEx + 9389 
10 org.python.python    0x0000000109c7e147 PyEval_EvalCodeEx + 1934 
11 org.python.python    0x0000000109cb7d7a 0x109c67000 + 331130 
12 org.python.python    0x0000000109c766c6 PyObject_Call + 97 
13 _objc.so      0x0000000109fcc758 0x109fb7000 + 87896 
14 libffi.dylib     0x00007fff9023b8a6 ffi_closure_unix64_inner + 508 
15 libffi.dylib     0x00007fff9023af66 ffi_closure_unix64 + 70 
16 com.apple.AppKit    0x00007fff923ce664 -[NSApplication _doOpenUntitled] + 482 
17 com.apple.AppKit    0x00007fff92619e93 -[NSApplication(NSAppleEventHandling) _handleAEReopen:] + 240 
18 com.apple.AppKit    0x00007fff923cbabc -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 351 
19 com.apple.Foundation   0x00007fff9505f35b -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 308 
20 com.apple.Foundation   0x00007fff9505f1bd _NSAppleEventManagerGenericHandler + 106 
21 com.apple.AE     0x00007fff94864f68 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 307 
22 com.apple.AE     0x00007fff94864dc9 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 37 
23 com.apple.AE     0x00007fff94864c89 aeProcessAppleEvent + 318 
24 com.apple.HIToolbox    0x00007fff94369e29 AEProcessAppleEvent + 100 
25 com.apple.AppKit    0x00007fff923c82a6 _DPSNextEvent + 1456 
26 com.apple.AppKit    0x00007fff923c7862 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 
27 com.apple.AppKit    0x00007fff923bec03 -[NSApplication run] + 517 
28 libffi.dylib     0x00007fff9023ade4 ffi_call_unix64 + 76 
29 libffi.dylib     0x00007fff9023b619 ffi_call + 853 
30 _objc.so      0x0000000109fd1557 PyObjCFFI_Caller + 1980 
31 _objc.so      0x0000000109fe6372 0x109fb7000 + 193394 
32 org.python.python    0x0000000109c766c6 PyObject_Call + 97 
33 org.python.python    0x0000000109c8078d PyEval_EvalFrameEx + 9728 
34 org.python.python    0x0000000109c84869 0x109c67000 + 120937 
35 org.python.python    0x0000000109c8063a PyEval_EvalFrameEx + 9389 
36 org.python.python    0x0000000109c7e147 PyEval_EvalCodeEx + 1934 
37 org.python.python    0x0000000109c7d9b3 PyEval_EvalCode + 54 
38 org.python.python    0x0000000109cb9c70 0x109c67000 + 339056 
39 org.python.python    0x0000000109cb9d3c PyRun_FileExFlags + 165 
40 org.python.python    0x0000000109cb9726 PyRun_SimpleFileExFlags + 410 
41 org.python.python    0x0000000109cdde27 Py_Main + 2715 
42 libdyld.dylib     0x00007fff946a07e1 start + 1

碰撞在線app.delegate().mainWindow = w。

爲什麼？難道我做錯了什麼？

來源

2012-09-06 Albert

我發現了這個問題。窗口上的常規關閉行爲會執行額外的release。請參閱here。

它變得更加清晰與此代碼導致死機一樣（在你將它設置爲None行）：

if app.delegate().mainWindow: 
    app.delegate().mainWindow.close() 
    app.delegate().mainWindow = None 
app.delegate().mainWindow = w

它崩潰，因爲close()已經解除分配的對象。然後PyObjC試圖再次釋放它。

因此，解決方法是：

w.setReleasedWhenClosed_(False)

另一種可能的解決辦法是不保留任何的Python參考NSWindow對象。然後，在setupWindow()，而不是設置mainWindow並返回窗口，只是做：

w.retain()

來源

2012-09-06 02:55:06 Albert

崩潰_class_getName在applicationOpenUntitledFile

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