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POPyObjC and method_exchangeImplementations: crash. correct usage?
 

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  1. POPyObjC and method_exchangeImplementations: crash. correct usage?
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    <p>I'm using PyObjC. PyObjC doesn't provide an interface to <code>method_exchangeImplementations</code> so I was trying to use the function via ctypes. I was trying to overwrite <code>windowShouldClose:</code> from some window controller class.</p> <p>My code:</p> <pre><code>import objc BrowserWindowController = objc.lookUpClass("BrowserWindowController") class BrowserWindowController(objc.Category(BrowserWindowController)): def myWindowShouldClose_(self, sender): print "myWindowShouldClose", self, sender return self.myWindowShouldClose_(sender) from ctypes import * capi = pythonapi # id objc_getClass(const char *name) capi.objc_getClass.restype = c_void_p capi.objc_getClass.argtypes = [c_char_p] # SEL sel_registerName(const char *str) capi.sel_registerName.restype = c_void_p capi.sel_registerName.argtypes = [c_char_p] def capi_get_selector(name): return c_void_p(capi.sel_registerName(name)) # Method class_getInstanceMethod(Class aClass, SEL aSelector) # Will also search superclass for implementations. capi.class_getInstanceMethod.restype = c_void_p capi.class_getInstanceMethod.argtypes = [c_void_p, c_void_p] # void method_exchangeImplementations(Method m1, Method m2) capi.method_exchangeImplementations.restype = None capi.method_exchangeImplementations.argtypes = [c_void_p, c_void_p] def hook_into_close(): clazz = capi.objc_getClass("BrowserWindowController") origClose = capi.class_getInstanceMethod(clazz, capi_get_selector("windowShouldClose:")) newClose = capi.class_getInstanceMethod(clazz, capi_get_selector("myWindowShouldClose:")) capi.method_exchangeImplementations(origClose, newClose) </code></pre> <p>This crashes. With some strange backtrace in <code>[NSWindow _close]</code>.</p> <p>Is the code basically right?</p> <p>What is the problem?</p>
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    1. USAlbert
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    1. COIs BrowserWindowController your class? If so, why are you exchanging its implementation for a different one rather than just doing what you need to do in its own implementation?
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      1. USPeter Hosey
    2. CO@Peter: No, it's coming from another framework where I cannot change the implementation.
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