Thanks for the clue it was not exactly what you said but it gave me
the right idea (namely instead of rebroadcasting I use normal method
calling to make a callback in Java for the keystroke)
On Fri, Dec 23, 2011 at 4:58 AM, Sam Spilsbury <smspil...@gmail.com> wrote:
> On Thu, Dec 22, 2011 at 9:20 AM, Aryeh Friedman
> <aryeh.fried...@gmail.com> wrote:
>> I have a Java program that calls the following code but somehow the
>> events are not rebroadcasted... from my very limited knowledge of X (I
>> have known C for years but never used it for GUI work) I highly
>> suspect I some how got the second arg wrong (it seems that the JAWT
>> window ID is not the same as the Xorg one)... since this is a high
>> priority project my client is willing to pay for 1 to 2 hours of
>> consulting on how to adjust the code to make it work... the final goal
>> is we want to block all keystrokes not meant for the actual app
>> (alt-f1:f9, ctl-alt-del, etc.)... namely the client is making a
>> application to apply standardized tests to distance learning students
>> and we need to enable a "kiosk" like mode (the user can not break out
>> the app [or as much as is possible]... the reason is we want to
>> prevent the test taker of using this as a work around the "closed
>> book" restriction on a "closed book" test)... I can either have no
>> event filtering (all events go their intended targets) or filtering
>> and no forwarding (namely if a invert the test of which process to
>> terminate on fork(2)).
>>
>> Note: I tried both InputFocus and PointerFocus for the target win of
>> the event but that doesn't work nor does key->win. Also I can handle
>> all the coding except the actual XLib/XCB calls.
>>
>> // src/c/KioskJNI.c
>>
>> /**
>> * Any C needed to make Kiosk Mode work as expected
>> *
>> * Copyright (C) 2010-2011. Friedman-Nixon-Wong Enterprises, LLC.
>> *
>> * @author aryeh
>> * @version Mon Dec 5 03:47:46 2011
>> */
>> #include <signal.h>
>> #include <X11/Xlib.h>
>> #include "jawt_md.h"
>> #include "client_kiosk_core_KioskJNI.h"
>>
>> /**
>> * Block all OS signals (param's ignored)
>> */
>> JNIEXPORT void JNICALL
>> Java_client_kiosk_core_KioskJNI_blockSigs(JNIEnv *env, jclass cls,
>> jobject comp)
>> {
>> Display *dpy=XOpenDisplay(0);
>> int i=0;
>>
>> for(i=0;i<256;i++)
>> signal(i,SIG_IGN);
>>
>> JAWT awt;
>>
>> printf("fart\n");
>>
>> // Get the AWT
>> awt.version = JAWT_VERSION_1_4;
>> jboolean result = JAWT_GetAWT(env, &awt);
>>
>> JAWT_DrawingSurface* ds=awt.GetDrawingSurface(env, comp);
>> ds->Lock(ds);
>> JAWT_DrawingSurfaceInfo* dsi=ds->GetDrawingSurfaceInfo(ds);
>> JAWT_X11DrawingSurfaceInfo* dsi_win =
>> (JAWT_X11DrawingSurfaceInfo*)dsi->platformInfo;
>>
>> printf("dsi %p\n",dsi);
>> printf("ds %p\n",ds);
>> jlong win=dsi_win->visualID;
>
> I don't know AWT very well, but I would assume that if it were using
> similar naming terminology to the rest of xlib, then I think that
> dsi_win->visualID; is probably not the correct
>
>> printf("dsi_win %p\n",win);
>>
>
> Have you tried using the result of this in xwininfo -id ?
>
>> // Free the drawing surface info
>> ds->FreeDrawingSurfaceInfo(dsi);
>>
>> // Unlock the drawing surface
>> ds->Unlock(ds);
>>
>> // Free the drawing surface
>> awt.FreeDrawingSurface(ds);
>>
>> XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
>> GrabModeAsync, CurrentTime);
>>
>> int pid=fork();
>>
>> if(!pid) {
>> return;
>> }
>>
>> printf("%d\n",pid);
>>
>> XEvent ev;
>>
>> while(1) {
>> XNextEvent(dpy,&ev);
>> XKeyEvent *key=(XKeyEvent *) &ev;
>>
>> printf("You typed a %d\n",key->keycode);
>>
>>
>> XSendEvent(dpy,win, True, (KeyPressMask | KeyReleaseMask),
>> &ev);
>
> Have you ensured that the receiving client has selected for
> KeyPressMask and KeyReleaseMask ?
>
> Check with xwininfo -id client_id -all
>
>> XFlush(dpy);
>> }
>>
>> XCloseDisplay(dpy);
>> }
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>
>
>
> --
> Sam Spilsbury
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