[Swig-user] A callback function with arguments causes error

[Bruce W. <bru...@gm...>]

Hi, all

I have some callback functions in my .cpp files and I want to wrap
them into python scripts with swig. So I have tried this example
first: swigwin-1.3.31/Examples/python/callback. This example compiles
and runs well. But this callback function takes no arguments, so I
changed it a little:

// example.h
class Callback {
public:
	virtual ~Callback() { std::cout << "Callback::~Callback()" << std:: endl; }
	// XXX this is the original statement
	// virtual void run() { std::cout << "Callback::run()" << std::endl; }
	virtual void run(int* pn) { std::cout << "Callback::run()" << (*pn)
<< std::endl; }
};


class Caller {
private:
	Callback *_callback;
public:
	Caller(): _callback(0) {}
	~Caller() { delCallback(); }
	void delCallback() { delete _callback; _callback = 0; }
	void setCallback(Callback *cb) { delCallback(); _callback = cb; }
	// XXX void call() { if (_callback) _callback->run(); }
	void call()
	{
		if (_callback)
        	{
        	    int i = 90;
        	    // XXX _callback->run(i);
        	    _callback->run(&i);
        	}
    	}
};


As you see, I just add a int* argument to this callback. It compiles
but it cause python.exe to crash while running. Could anybody tell me
how to solve this? Any help would be appreciated!


Bruce