2 messages in net.java.dev.jna.usersRe: [jna-users] InputOnly window to m...
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Kim EikNov 21, 2007 7:14 pm 
Timothy WallNov 21, 2007 9:01 pm 
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Subject:Re: [jna-users] InputOnly window to manage read events.Actions...
From:Timothy Wall (twal@dev.java.net)
Date:Nov 21, 2007 9:01:49 pm
List:net.java.dev.jna.users

If you're not sure what you're doing, I'd recommend getting the thing to work in a simple C program first. Then you can worry about mapping into Java.

On Nov 21, 2007, at 10:15 PM, Kim Eik wrote:

I implemented this javacode, and crossed my fingers. But no, i encountered several issues trying to make this work.

1. There is a structure X11.XSetWindowAttributes which cant be passed along the method XCreateWindow as i recieve this error:

Exception in thread "main" java.lang.IllegalArgumentException: The type "boolean" is not supported as a Structure field at com.sun.jna.Structure.getNativeSize(Structure.java:738) at com.sun.jna.Structure.getNativeSize(Structure.java:758) at com.sun.jna.Structure.calculateSize(Structure.java:640) at com.sun.jna.Structure.allocateMemory(Structure.java:173) at com.sun.jna.Structure.<init>(Structure.java:96) at com.sun.jna.Structure.<init>(Structure.java:90) at com.sun.jna.Structure.<init>(Structure.java:86) at com.sun.jna.examples.unix.X11$XSetWindowAttributes.<init> (X11.java:291) at teste2.main(teste2.java:22)

"boolean" should auto-map to native "int", but if it doesn't, you can just use what's appropriate for the native size. "boolean" isn't a C type, and varies depending on the library (sometimes "char", sometimes "int").

So i progressed with creating my own structure, but since im extending com.sun.jna.examples.unix.X11 from my X11 interface it will use the X11.XSetWindowAttributes by default instead of XSetWindowAttributes.

i then just set the arguments required to null and hoped for the best. which didnt turn out well :) it seems i create the window, but i dont recieve any events. and if i try to get window information through XGetWMName i recieve segfaults.

Passing null arguments to a library will more often than not result in a crash. Especially if the argument is used to return a value, as in XGetWMName. Again, I'd recommend getting a simple C program to work first (it's easier to run it under a debugger like "gdb" to see what's wrong).

im fresh out of ideas on where to go now. Can anyone help me?

import java.awt.Dimension; import java.awt.Toolkit;

import com.sun.jna.Native; import com.sun.jna.NativeLong; import com.sun.jna.examples.unix.X11.Display; import com.sun.jna.examples.unix.X11.Window;

public class teste2 extends Thread {

final static X11 INSTANCE = (X11)Native.loadLibrary("/usr/lib/ libX11.so", X11.class); final static Display d = INSTANCE.XOpenDisplay(":0.0");

public static void main(String[] args) throws InterruptedException, InstantiationException, IllegalAccessException {

Window rootWin = INSTANCE.XDefaultRootWindow(d); Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); System.out.println(dim.width+"x"+dim.height); Window n = INSTANCE.XCreateWindow(d, rootWin, 0, 0, dim.width, dim.height, 0, 0, 0, null,0,null); System.out.println(INSTANCE.XSelectInput(d, n, new NativeLong (X11.PointerMotionMask))); System.out.println(INSTANCE.XMapWindow(d, n)); INSTANCE.XRaiseWindow(d, n);

System.out.println(n.toNative());

/*XTextProperty t = null; INSTANCE.XGetWMName(d, n, t); System.out.println(t.value);*/

XEvent e = null; while(true){ INSTANCE.XNextEvent(d,e); System.out.println(e); } } }

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