05-31-2008
send characters to current window
Before I re-invent the wheel...
I have written an on-screen keyboard & handwriting input client in Java (spare me please, I get paid to write Java and it will take some time to get back up to speed in C & X11).
In order to concentrate on the other bits, I took advantage of a hack that uses the '-text' facility of the estimable XVkbd package to actually send the recognized text to X11. My client does not accept the focus, so the text is sent to the focused window.
The Java client only sends a character, rather than the 'keydown-keyup' pair X11 uses, so Java latency isn't an issue, but I nevertheless get repeat characters - like a key was held down. I'm assuming this is from my misuse of XVkbd, spawned from the Java session.
I can rip up the XVkbd code to make something, but I will feel silly when someone points out that there is already an app or a library call that does this, or could easily be made to do this:
1) Accept a unicode character or string.
2) Put that to the X11 server definitively (little or no lag between 'keydown' and 'keyup').
An existing daemon or library call that can be wrapped with a daemon and spoken to over dbus would be good - something I can 'nice' to -5 perhaps, so that it just happens. User input on a tablet computer (what I'm writing for) isn't likely to be so rapid as to overwhelm the system.
I am aware of the Escher-X11 Java project, and that's no good - it doesn't avoid the possibility that the system will be too busy between times it gets around to running the JVM thread. Definitive at the system level is what's important here, so this aspect can be solved, and I/we can get on with writing Tablet support for Linux/Unix.
Thanks in advance for any help.
Cheers,
Bret
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LEARN ABOUT SUSE
dacs.java
DACS.JAVA(7) DACS Miscellaneous Information DACS.JAVA(7)
NAME
dacs.java - DACS Java support
DESCRIPTION
This document describes support for Java provided by DACS.
To enable Java support, DACS must be configured using the --enable-java flag. It may also be necessary to specify the location of the Java
commands and include files. See dacs.install(7)[1].
Note
Java support is currently very limited and should be considered experimental. It is currently only possible to call dacsauth(1)[2] and
dacscheck(1)[3] using the Java Native Interface (JNI) provided. The command line arguments to both of these commands are exactly as
documented in their manual pages. Each argument is passed as a String.
The code is not thread-safe and is probably not suitable for being called many times within a particular process due to assumptions it
makes about dynamic memory allocation.
There are no immediate plans to improve or extend Java support. Using the existing capability to build the JNI layer, however, it
should not be difficult for an experienced Java programmer to build upon the example Java code provided.
With Java support enabled, building DACS will copy the JNI shared library and a .jar file to the library directory (default:
/usr/local/dacs/lib), and the JNI include files to the include directory (default: /usr/local/dacs/include).
The tools/java/jni distribution directory contains a simple script called javarun that demonstrates how to run dacsauth or dacscheck as a
Java application. For example, to validate the Unix password for user somebody, run (as root):
./javarun dacsauth -m unix suff -user somebody -prompt
DIAGNOSTICS
The return codes are as documented in the command's manual page.
AUTHOR
Distributed Systems Software (www.dss.ca[4])
COPYING
Copyright2003-2012 Distributed Systems Software. See the LICENSE[5] file that accompanies the distribution for licensing information.
NOTES
1. dacs.install(7)
http://dacs.dss.ca/man/dacs.install.7.html
2. dacsauth(1)
http://dacs.dss.ca/man/dacsauth.1.html
3. dacscheck(1)
http://dacs.dss.ca/man/dacscheck.1.html
4. www.dss.ca
http://www.dss.ca
5. LICENSE
http://dacs.dss.ca/man/../misc/LICENSE
DACS 1.4.27b 10/22/2012 DACS.JAVA(7)