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POProxing Python class to Objective-C
 

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  1. POProxing Python class to Objective-C
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    <p>I try to proxy existing Python class to Objective-C. I started from simple sample of Python class:</p> <p><strong>Test.py</strong></p> <pre><code> class Test: def __init__(self): self.text = "" def addText(self, _text): self.text = self.text + _text def addSomeText(self): self.addText("SomeText") </code></pre> <p>Then I wrote Objective-C class for it.</p> <p><strong>ITest.h</strong></p> <pre><code> #import &lt;Cocoa/Cocoa.h&gt; @interface ITest : NSObject - (void) addText: (NSString *)text; - (void) addSomeText; + newTest; @property (nonatomic, assign, getter = _text) NSString *text; @end </code></pre> <p><strong>ITest.m</strong></p> <pre><code> #import "ITest.h" #define ABSTRACT { return nil; } #define ABSTRACT_VOID { } @implementation ITest @dynamic text; - (void) addText: (NSString *)text ABSTRACT_VOID; - (void) addSomeText ABSTRACT_VOID; + newTest { return [[NSClassFromString(@"TestProxy") new] autorelease]; } @end </code></pre> <p>My proxy class (following some articles about PyObjC I subclassing Objective-C class and subclassing original class to access its instance variables):</p> <p><strong>TestProxy.py</strong></p> <pre><code> import Foundation import objc from Test import Test ITest = objc.lookUpClass("ITest") class TestProxy (ITest, Test): # getters/setters def setText_(self, _text): self.text = _text def _text(self): return self.text # methods def addText_(self, text): Test.addText(self, text) def addSomeText(self): Test.addSomeText(self) </code></pre> <p>Now, if I do</p> <p><code>ITest *test = [ITest newTest];</code></p> <p>I always get <code>nil</code> with no warnings or errors in the debug console.</p> <p>If I remove all imports and references to original <code>Test</code> class, I'll get working object. I noticed, that <code>nil</code> will be returned exactly as soon as I add <code>from Test import Test</code>.</p> <p>I think this happens because PyObjC trying to bridge the <code>Test</code> class and fails because its methods do not conform bridge naming rules.</p> <p>Is there a way to say PyObjC not to do so? Or, maybe, all stuff I did is wrong and there is a better way to translate existing Python stuff to Objective-C?</p>
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    1. COYou are doing a few strange things that I would expect to cause problems later, but as far as creating an instance of `ITest`, your code runs successfully for me. I assume you're checking the value immediately after `ITest *test = [ITest newTest];`? I.e., `NSLog(@"%@", test);` -- this prints `<TestProxy: 0x4290ca0>` when I do so on the very next line.
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      1. USJosh Caswell
    2. CO@josh-caswell Well, I'm pretty new to PyObjC and it isn't well documented. How do you incorporate python stuff? I created a framework target with all files mentioned above which depends on Python.framework and added .m file with function TestProxy_Init — ...skip PYTHONPATH stuff... Py_Initialize(); PyImport_ImportModule("TestProxy");. In my main app I call TestProxy_Init and creating ITest.
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      1. USasavartsov
    3. COYour experience is more Python than Obj-C, I take it? The docs for PyObjC are definitely not comprehensive. The important thing for figuring this problem out is: where are you checking the value of `test`? Could you post the code of this `TestProxy_Init` function, and the code that calls it?
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