Hi all, I'm new to Clojure and I'm playing around with Qt Jambi, which works as expected, until I started to use a self written macro. Now I don't know if this is just a problem I don't see (probably) or if it is a bug in Clojure. I have the following sample code (I hope this is readable when posted. Otherwise I'll use something like pastebin):
> (ns a.namespace.sample > (:gen-class) > (:import > (com.trolltech.qt.gui QApplication QMainWindow))) > > (defmacro RunQt [args & body] > `( > (try > (QApplication/initialize (into-array [~args])) > (catch RuntimeException e# (println e#))) > ~...@body > (QApplication/exec))) > > > (defn -main [args] > (RunQt args > (let [mainWindow (QMainWindow.)] > (.show mainWindow)))) > > (defn -main2 [args] > (try > (QApplication/initialize (into-array [args])) > (catch RuntimeException e (println e))) > (let [mainWindow (QMainWindow.)] > (.show mainWindow)) > (QApplication/exec)) > > > ; (-main "") > ; (-main2 "") Now both -main and -main2 work as expected, they show a simple Window with nothing in it. So far so good. But after I close the Window, - main throws the following exception: > Exception in thread "main" java.lang.NullPointerException (qtest.clj:0) > at clojure.lang.Compiler.eval(Compiler.java:4543) > at clojure.lang.Compiler.load(Compiler.java:4857) > at clojure.lang.Compiler.loadFile(Compiler.java:4824) > at clojure.main$load_script__5833.invoke(main.clj:206) > at clojure.main$script_opt__5864.invoke(main.clj:258) > at clojure.main$main__5888.doInvoke(main.clj:333) > at clojure.lang.RestFn.invoke(RestFn.java:413) > at clojure.lang.Var.invoke(Var.java:346) > at clojure.lang.AFn.applyToHelper(AFn.java:173) > at clojure.lang.Var.applyTo(Var.java:463) > at clojure.main.main(main.java:39) > Caused by: java.lang.NullPointerException > at a.namespace.sample$_main__8.invoke(qtest.clj:16) > at a.namespace.sample$eval__20.invoke(qtest.clj:29) > at clojure.lang.Compiler.eval(Compiler.java:4532) > ... 10 more whereas -main2 does not. Now they both look to my newbie eyes the same, except the code of -main is generated by a macro. This is the same if I compile the code. The uncompiled version I started with (paths omitted for better readability): > java -cp clojure.jar;qtjambi-4.5.2_01.jar;qtjambi-win32-msvc2005-4.5.2_01.jar > clojure.main qtest.clj I have this behavior under WinXP and 2k, with Java RE 1.5.x and with JDK 1.6.0_16, Clojure 1.0.0 and the latest Qt Jambi. Am I just missing something totally fundamental and this is expected behavior? I fiddled with this code for I don't know how long, tried this and that but cannot figure out where this NullPointerException is coming from. Any help would be appreciated. Thanks and greetings.... --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
