[JNI] get the window ID

Question

Hi,
I'd like to get the window ID of a frame. I'm runing java on Linux.
I've seen on a web site that I can get it from the JAWT_X11DrawingSurfaceInfo.
So I did this to get the JAWT_X11DrawingSurfaceInfo :
JNIEXPORT jlong JNICALL Java_MyFrame_getWindowID(JNIEnv *env, jclass cls, jobject comp) {
  JAWT awt;
  JAWT_DrawingSurface *ds;
  JAWT_DrawingSurfaceInfo *dsi;
  JAWT_X11DrawingSurfaceInfo *dsi_X11;
  jint lock;
  jlong windowID;
  jboolean result;
  /* get the awt */
  awt.version = JAWT_VERSION_1_3;
  result = JAWT_GetAWT(env, &awt);
  assert(result != JNI_FALSE);
  /* get the drawing surface */
  ds = awt.GetDrawingSurface(env, comp);
  assert(ds != NULL);
  /* lock the drawing surface */
  lock = ds->Lock(ds);
  assert((lock & JAWT_LOCK_ERROR) == 0);
  /* get the drawing surface info */
  dsi = ds->GetDrawingSurfaceInfo(ds);
  /* get the X11 drawing surface info */
  dsi_X11 = (JAWT_X11DrawingSurfaceInfo*)dsi->platformInfo;
  windowID = (jlong)dsi_X11->visualID;
  /* resource cleanup */
  ds->FreeDrawingSurfaceInfo(dsi);
  ds->Unlock(ds);
  awt.FreeDrawingSurface(ds);
  return windowID;
}My pb is that I can't lock my frame. It always crash here : assert((lock & JAWT_LOCK_ERROR) == 0);
I'm completly lost at the moment, any help will be welcome.
Thank you for your answers.
Nicolas

Answer 1

Linux_Java wrote:
How do i get the Window Id / handle to java frame.You can't get it from within Java, that much I know, and in fact since it is an OS construct it is meaningless in java. If you are working with MS Windows, I'm guessing that your best bet is to play with some of the functions in the User32 library, such as enumerateWindows and such, and by doing this you'll find out how to get a handle on the JFrame. If it's unix/linux (and given your name, that is a reasonable assumption) then I have no idea.
If I am giving any actionlistener to my frame that has to be reflected in C windowNo idea what you mean here.
Anybody can send me the full source code too.Doesn't this kind of go against the philosophy of these forums?
Also, consider posting this sort of question in the JNI forum where you will have a much better chance of getting a JNI guru who actually knows what he's talking about instead of, well, me.