linux - Java /dev/input/eventX -


currently have n-trig multitouch panel hooked event file /dev/input/event4, , trying this access it. have included of natives , such in java.library.path getting error when superuser. exception:

java.io.ioexception: invalid argument     @ sun.nio.ch.filedispatcherimpl.read0(native method)     @ sun.nio.ch.filedispatcherimpl.read(filedispatcherimpl.java:46)     @ sun.nio.ch.ioutil.readintonativebuffer(ioutil.java:223)     @ sun.nio.ch.ioutil.read(ioutil.java:197)     @ sun.nio.ch.filechannelimpl.read(filechannelimpl.java:149)     @ com.dgis.input.evdev.eventdevice.readevent(eventdevice.java:269)     @ com.dgis.input.evdev.eventdevice.access$1(eventdevice.java:265)     @ com.dgis.input.evdev.eventdevice$1.run(eventdevice.java:200) event:  null exception in thread "thread-0" java.lang.nullpointerexception     @ com.asdev.t3.bootstrap$1.event(bootstrap.java:41)     @ com.dgis.input.evdev.eventdevice.distributeevent(eventdevice.java:256)     @ com.dgis.input.evdev.eventdevice.access$2(eventdevice.java:253)     @ com.dgis.input.evdev.eventdevice$1.run(eventdevice.java:201)

does know why happens? thanks

i answered question on project's issues page.

by attilapara
hi, tried use library on raspberry pi , got same exception, figured out source of problem , managed work. basically, problem library written 64 bit cpu/os only. explanation:

the input_event structure looks (source):

struct input_event {     struct timeval time;     unsigned short type;     unsigned short code;     unsigned int value; };

here have timeval, has following members (source):

time_t         tv_sec      seconds suseconds_t    tv_usec     microseconds

these 2 types represented differently on 32 bit , 64 bit system.

the solution:

  1. change size of input_event 24 16 bytes:

change line 34 of source file evdev-java/src/com/dgis/input/evdev/inputevent.java this:

    public static final int struct_size_bytes = 24; this:      public static final int struct_size_bytes = 16; change parse function in same source file follows:  public static inputevent parse(shortbuffer shortbuffer, string source) throws ioexception {     inputevent e = new inputevent();     short a,b,c,d;      a=shortbuffer.get();     b=shortbuffer.get();     //c=shortbuffer.get();     //d=shortbuffer.get();     e.time_sec = (b<<16) | a; //(d<<48) | (c<<32) | (b<<16) | a;     a=shortbuffer.get();     b=shortbuffer.get();     //c=shortbuffer.get();     //d=shortbuffer.get();     e.time_usec = (b<<16) | a; //(d<<48) | (c<<32) | (b<<16) | a;     e.type = shortbuffer.get();     e.code = shortbuffer.get();     c=shortbuffer.get();     d=shortbuffer.get();     e.value = (d<<16) | c;     e.source = source;      return e; }

Comments

Post a Comment

Popular posts from this blog

cakephp - simple blog with croogo -

i not problem, made simple blog in croogo, problem is not adding or modifying or delete, because arabic language ?? function add in controller `public function admin_add() { $this->set('title_for_layout', __('add part')); if (!empty($this->request->data)) { $this->part->create(); if ($this->part->save($this->request->data)) { $this->session->setflash(__('the part has been saved'), 'default', array('class' => 'success')); $this->redirect(array('action' => 'index'));//, $this->part->id)); } else { $this->session->setflash(__('the part not saved. please, try again.'), 'default', array('class' => 'error')); } } }` => model `class part extends appmodel { public $name = 'part'; var $belongst...
Read more

How to group boxplot outliers in gnuplot -

i have large set of data points. try plot them boxplot, of outliers exact same value , represented on line beside each other. found how set horizontal distance between outliers in gnuplot boxplot , doesn't much, apparently not possible. is possible group outliers together, print 1 point , print number in brackets beside indicate how many points there are? think make more readable in graph. for information, have 3 boxplots 1 x value , times 6 in 1 graph. using gnuplot 5 , played around pointsize, doesn't reduce distance anymore. hope can help! edit: set terminal pdf set output 'dat.pdf' file0 = 'dat1.dat' file1 = 'dat2.dat' file2 = 'dat3.dat' set pointsize 0.2 set notitle set xlabel 'x' set ylabel 'y' header = system('head -1 '.file0); n = words(header) set xtics ('' 1) set [i=1:n] xtics add (word(header, i) i) set style data boxplot plot file0 using (1-0.25):1:(0.2) boxplot lw 2 lc rgb '#8b0000...
Read more

bash - Performing variable substitution in a string -

i have string contains use of variable, , i'd substitute variable's value string. right best have is #!/bin/bash foo='$name; echo bar' name="the name" expanded="$(eval echo "$foo")" echo "$expanded" which has obvious defects: prints the name bar while i'd print the name; echo bar instead of eval can bash's regex matching bash's string replacement: foo='$name; echo bar' name="the name" [[ "$foo" =~ \$([[:alnum:]]+) ]] && s="${!bash_rematch[1]}" && expanded="${foo/\$${bash_rematch[1]}/$s}" echo "$expanded" name; echo bar
Read more