Got atoms?

This is a piece of useful code I forgot to save a while back so I had to take some time to research it again. It's for getting Xlib window property information. Change the XA_STRING to fit your needs based on the types in X11/Xatom.h.

  Atom* atoms;
  int num_prop_return = 0;
  atoms = XListProperties(m_display, window, &num_prop_return);
  
  for(int i = 0; i < num_prop_return; i++) {
    Atom atom = *atoms;
    QString name = XGetAtomName(m_display, atom);
    atoms++;
  
    Atom type;
    int format;
    long offset = 0;
    long length = 8192;
    unsigned long nitems, after;
    unsigned char *data = 0;
    XGetWindowProperty(m_display,
                       window,
                       atom,
                       offset,
                       length,
                       False,
                       XA_STRING,
                       &type,
                       &format,
                       &nitems,
                       &after,
                       &data);
    qDebug() << name << QString::fromLatin1((const char*) data);
  }

  XFree(atoms);

References:
Xlib Properties and Atoms
qapplication_x11.cpp