Xlib search window by his name Post: 302932168

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Top Forums Programming Xlib search window by his name Post 302932168 by Loustak on Monday 19th of January 2015 03:16:45 PM

01-19-2015

Registered User

Xlib search window by his name

Hello,
I just try to get the control of a Window by searching his name. I curretly do that :

Code:

Window CMD::window_from_name_search(Display *display, Window current, char const *needle)
{
    Window retval, root, parent, *children;
    unsigned children_count;
    char *name = NULL;

    /* Check if this window has the name we seek */
    if(XFetchName(display, current, &name) > 0) {
        int r = strcmp(needle, name);
        XFree(name);
        if(r == 0) {
            return current;
        }
    }

    retval = 0;

    /* If it does not: check all subwindows recursively. */
    if(0 != XQueryTree(display, current, &root, &parent, &children, &children_count)) {
        unsigned i;
        for(i = 0; i < children_count; ++i) {
            Window win = window_from_name_search(display, children[i], needle);

            if(win != 0) {
                    retval = win;
                break;
            }
        }
        XFree(children);
    }
    return retval;
}

void CMD::window_from_name(char const *name)
{
    m_display = XOpenDisplay(NULL);
    m_root_win = XDefaultRootWindow(m_display);
    m_screen = DefaultScreenOfDisplay(m_display);
    m_window_terminal = window_from_name_search(m_display, m_root_win, name);
}

That previous code should let me play with the window, no ?
But I get an error, a bad window value. I don't Know why. Ps: I'm closing the connection with the X server in the destructor of my class CMD, and I think the problem is here.
Thanks for helping.

EDIT: After some search the m_window_terminal is set to NULL if I don't add a std::cout << "" << std::endl; in the previous function. WHY ?

Last edited by Loustak; 01-19-2015 at 04:22 PM..

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xsetwmname

XSetWMName(3X11)						     MIT X11R4							  XSetWMName(3X11)

Name
       XSetWMName, XGetWMName, XStoreName, XFetchName - set or read a window's WM_NAME property

Syntax
       void XSetWMName(display, w, text_prop)
	  Display *display;
	  Window w;
	  XTextProperty *text_prop;

       Status XGetWMName(display, w, text_prop_return)
	  Display *display;
	  Window w;
	  XTextProperty *text_prop_return;

       XStoreName(display, w, window_name)
	  Display *display;
	  Window w;
	  char *window_name;

       Status XFetchName(display, w, window_name_return)
	  Display *display;
	  Window w;
	  char **window_name_return;

Arguments
       display	 Specifies the connection to the X server.

       text_prop Specifies the structure to be used.

       text_prop_return
		 Returns the structure.

       w	 Specifies the window.

       window_name
		 Specifies the window name, which should be a null-terminated string.

       window_name_return
		 Returns a pointer to the window name, which is a null-terminated string.

Description
       The convenience function performs a on the WM_NAME property.

       The convenience function performs an on the WM_NAME property.

       The function assigns the name passed to window_name to the specified window.  A window manager can display the window name in some promi-
       nent place, such as the title bar, to allow users to identify windows easily.  Some window managers may display a window's name in the win-
       dow's icon, although they are encouraged to use the window's icon name if one is provided by the application.

       can generate and errors.

       The function returns the name of the specified window.  If it succeeds, it returns nonzero; otherwise, no name has been set for the window,
       and it returns zero.  If the WM_NAME property has not been set for this window, sets window_name_return to NULL.  When finished with it, a
       client must free the window name string using

       can generate a error.

Properties
       WM_NAME	 Name of the application.

Diagnostics
       The server failed to allocate the requested resource or server memory.

       A value for a Window argument does not name a defined Window.

See Also
       XAllocClassHint(3X11), XAllocIconSize(3X11), XAllocSizeHints(3X11), XAllocWMHints(3X11), XFree(3X11), XSetCommand(3X11), XSetTransient-
       ForHint(3X11), XSetTextProperty(3X11), XSetWMClientMachine(3X11), XSetWMColormapWindows(3X11), XSetWMIconName(3X11), XSetWMProper-
       ties(3X11), XSetWMProtocols(3X11), XStringListToTextProperty(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

																  XSetWMName(3X11)