If somebody cares, I have found the solution myself (thanks for reading anyway).
In this situation once has to call QueryInterface explicitly on the interfaces returned in the array, to 'cast' them to real interface requested. Sorry for bugging you guys and thanks :) "Denis Suhanov" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hello, > > I am pretty new to XPCOM, but I really enjoy working with it. However, I now > am facing problems that I am unable to solve. I got an interface that > returns an array of other interface pointers: > > void parse( in string fname, out unsigned long count, [retval, array, > size_is(count)]out nsIPlaylistEntry result ); > > The component implementing the interface, is written in Python and it just > returns Python list as a result of the call: > > def parse(self): > try: > # open XML file > f = open(self.fname, "r") > # create content handler and set it in expat > p = make_parser() > dh = content_handler() > p.setContentHandler() > # parse the XML > # white parsing, it will fill a list of Python classes that are > derived from nsIEntry interface > p.parse(f) > > # and return the list of entries (dh.entries is Python's list) > # and every entry in the list is Python class that implements > appropriate interface > # but is not a component. > return dh.entries > > catch Exception, error: > raise ServerException, nsError.NS_ERROR_FAILURE > > Now when I am trying to call this method from my C++ program, it is getting > really confusing: > > nsresult rv; > nsCOMPtr<nsIParamXMLParser> parser(do_CreateEntry(XML_PARSER_CONTRACT_ID, > &rv); > if ( NS_SUCCEEDED(rv) ) { > // parse the file and get the results > PRUint32 count; > nsIEntry **array; // I am using raw pointer because I do not know how to > use nsCOMPtr<> here > rv = parser->parse(fname.c_str(), &count, &array); > if ( NS_SUCCEEDED(rv) ) { > // here we should get the array with interface pointers > // !!! > } > } > > Now at the line with !!!, I have several problems. First, I do not know what > is the right way to call AddRef on the interfaces that are returned to me in > the array (getter_AddRefs<>() is not going to work with an array). I am > getting a valid pointer to an array of pointers (I can see the instances of > Python stubs in the debugger), but every time when I am trying to call > anythings except AddRef() on these pointers, the program crashes somewhere > in xpcom.dll. > > Please if you ever were in this or simular situation, let me know what am I > doing wrong and how I can modify my program to make it work. Oh, I have > forgotten one thing - I am using standalong xpcom, not mozilla. > > Thanks a lot in advance. > >
