to create X window(X11) in java swing and to get its id

Question

Can anyone help me in creating an X11 window in java swing using eclipse?And also the function to get the x11 id also.What are the basic requirement for creating an X11 window in java.

Answer 1

Tom answered the first part of your question. The second part of the answer is: to get the id of an X11 window you are going to have to use native code (code written in C or C++) and access it through the JNI interface.

You may have to run a search by title through all existing windows to get the one you desire.

Here is a recursive function that will search (starting from the root window) for a window with the desired name

Window windowWithName(Display *dpy, Window top, char *name)
{
    Window *children, dummy;
    unsigned int nchildren;
    unsigned int i;
    Window w = 0;
    char *window_name;

    if (XFetchName(dpy, top, &window_name) && !strcmp(window_name, name))
        return (top);

    if (!XQueryTree(dpy, top, &dummy, &dummy, &children, &nchildren))
        return (0);

    for (i = 0; i < nchildren; i++)
    {
        w = windowWithName(dpy, children[i], name);
        if (w)
            break;
    }
    if (children)
        XFree((char *) children);
    return (w);
}

Note: **unfortunately there is a well documented memory leak in the XFetchName function implemented in X11 that was never fixed. If you run valgrind and have minor memory leak issues this is whats causing them.