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5 messages in net.java.dev.jna.usersRe: [jna-users] Callback repeatedly c...| From | Sent On | Attachments |
|---|---|---|
| Paul Gifford | Sep 12, 2008 7:48 am | |
| Timothy Wall | Sep 12, 2008 8:14 am | |
| Paul Gifford | Sep 12, 2008 8:46 am | |
| Timothy Wall | Sep 12, 2008 8:50 am | |
| Paul Gifford | Sep 12, 2008 9:27 am |
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| Subject: | Re: [jna-users] Callback repeatedly called | Actions... |
|---|---|---|
| From: | Timothy Wall (twal...@dev.java.net) | |
| Date: | Sep 12, 2008 8:14:57 am | |
| List: | net.java.dev.jna.users | |
On Sep 12, 2008, at 10:49 AM, Paul Gifford wrote:
Hi,
I've got my callback installed and it seems to be working, except it gets called repeatedly. I've duplicated C++ code that uses callbacks - C++ Builder and Visual C++ samples that work fine. Is it possible I've done something wrong with JNA to cause this?
In my callback I have a couple of system.outs and after a while I get this exception:
java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.jna.CallbackReference $DefaultCallbackProxy.callback_inner(CallbackReference.java:274) at com.sun.jna.CallbackReference $DefaultCallbackProxy.callback(CallbackReference.java:296) Caused by: java.lang.StackOverflowError at sun.nio.cs.SingleByteEncoder.encodeArrayLoop(SingleByteEncoder.java: 91) at sun.nio.cs.SingleByteEncoder.encodeLoop(SingleByteEncoder.java:130) at java.nio.charset.CharsetEncoder.encode(CharsetEncoder.java:544) at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:252) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:106) at java.io.OutputStreamWriter.write(OutputStreamWriter.java: 190) at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:111) at java.io.PrintStream.newLine(PrintStream.java:495) at java.io.PrintStream.println(PrintStream.java:757) at footietest.RunMe$4.callback(RunMe.java:210) ... 5 more
If I remove the system.outs, when I close the application I get this message:
JNA: uncaught exception in callback, continuing
Any ideas on what I might be doing wrong?
Your callback is overflowing the stack with whatever it is sending to PrintStream.println.
The callback_inner stuff is a wrapper around your callback code to catch exceptions that you don't catch.
Your callback apparently doesn't return until you close the application. Is that expected? Do you catch any exceptions which might be thrown by your callback? What's your callback method signature?