From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,d35f23bd2fe2deb X-Google-Attributes: gid103376,public From: stt@houdini.camb.inmet.com (Tucker Taft) Subject: Re: Ada-Java quick question Date: 1997/03/09 Message-ID: #1/1 X-Deja-AN: 224239007 Sender: news@inmet.camb.inmet.com (USENET news) X-Nntp-Posting-Host: houdini.camb.inmet.com References: <331EF1AE.6607@fn3.freenet.tlh.fl.us> Organization: Intermetrics, Inc. Newsgroups: comp.lang.ada Date: 1997-03-09T00:00:00+00:00 List-Id: Kendal Van Dyke (kendal@fn3.freenet.tlh.fl.us) wrote: : I'm working on an applet where I'd like to use a media tracker prevent : the applet from starting until all the images have been loaded, but I am : running into a slight problem. I don't quite know how to call : new_MediaTracker. Here's the code I have: : procedure init(obj : access tankwar_obj) is : tracker : mediatracker_ptr := new_mediatracker([something]); : begin : ...some code here..... : end init; : According to the Ada-Java API [something] has to be of type : component_ptr. In regular Java, it's usually called as : "new MediaTracker(this)". I know that in most cases in Ada-Java you can : use "null" in place of "this" and it will work, but it didn't in this : case. So, in this code, what would I use to fill in the [something] : part? What is a tankwar_obj? If it is derived directly or indirectly from java.awt.Component.Component_Obj then you can write: ... := new_mediatracker(Component_Ptr(obj)); Otherwise, you will need to pass an additional parameter to "init" which is some derivative of Component_Obj. Note that java.applet.Applet.Applet_Obj is derived from Component_Obj, so if tankwar_obj is the applet object, then you can use that. Ada 95 requires the explicit conversion to Component_Ptr, because its type checking model is "stronger" than Java's for access types (not necessarily helpfully stronger in cases like this). : *.........................................* : . |/ . : . |\ENDAL . : . WWW => http://www.cs.fsu.edu/~vandyke . : . EMail => vandyke@cs.fsu.edu . : . Pager => (904) 297-6658 . : . . : *.........................................* -Tucker Taft stt@inmet.com http://www.inmet.com/~stt/ Intermetrics, Inc. Burlington, MA USA