Hello, I'm experiencing a difficulty using write callbacks and I'd like to ask how/whether is possible to do what I have to do. I outline the scenario briefly below:
* The callback I want to use is a public member function of class A. The reasoning behind this is that I'd like to update some state in this class (e.g. a member variable that holds bytes read so far), each time the callback is called. * The code that performs the curl read operations is in member function of another class (class B), say B::readData( ). * The way I'm implementing the above now (and is not working) is to boost::bind the callback to the instance of A, pass the boost::function object that bind returns to B::readData( ), and there do the appropriate reinterpret_cast-ing to produce a C-style function pointer that libcurl expects. My question is whether libcurl supports/will support a different kind of signature for the callback function, one with an extra (void *) argument, where we can pass in some state (and thus make it a truer sort-of-speak callback). Right now, there's no way to pass any state to the callback from what I understand. If there were such an extra argument, we could pass a pointer to an A object to the callback and use it appropriately there. I hope this was not very confusing. Thanks Alex ------------------------------------------------------------------- List admin: http://cool.haxx.se/list/listinfo/curl-library Etiquette: http://curl.haxx.se/mail/etiquette.html
