Tk_Name(3tk)

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NAME

       Tk_Name,  Tk_PathName, Tk_NameToWindow - convert between names and win-
       dow tokens

SYNOPSIS

       #include <tk.h>

       Tk_Uid
       Tk_Name(tkwin)

       char *
       Tk_PathName(tkwin)

       Tk_Window
       Tk_NameToWindow(interp, pathName, tkwin)

ARGUMENTS

       Tk_Window    tkwin       (in)      Token for window.

       Tcl_Interp   *interp     (out)     Interpreter to use for error report-
                                          ing.

       CONST char   *pathName   (in)      Character   string  containing  path
                                          name of window.
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DESCRIPTION

       Each window managed by Tk has two names, a short name that identifies a
       window  among children of the same parent, and a path name that identi-
       fies the window uniquely among all the windows belonging  to  the  same
       main  window.   The  path  name is used more often in Tk than the short
       name;  many commands, like bind, expect path names as arguments.

       The Tk_Name macro returns a window's short name, which is the  same  as
       the  name  argument  passed to Tk_CreateWindow when the window was cre-
       ated.  The value is returned as a Tk_Uid, which may be used just like a
       string  pointer but also has the properties of a unique identifier (see
       the manual entry for Tk_GetUid for details).

       The Tk_PathName macro returns a  hierarchical  name  for  tkwin.   Path
       names  have  a  structure  similar  to file names in Unix but with dots
       between elements instead of slashes:  the main window for  an  applica-
       tion  has the path name ``.'';  its children have names like ``.a'' and
       ``.b''; their children have names like ``.a.aa'' and ``.b.bb''; and  so
       on.  A window is considered to be be a child of another window for nam-
       ing purposes if the second window was named as the first window's  par-
       ent  when the first window was created.  This is not always the same as
       the X window hierarchy.  For example, a pop-up is created as a child of
       the root window, but its logical parent will usually be a window within
       the application.

       The procedure Tk_NameToWindow returns the token for a window given  its
       path  name  (the pathName argument) and another window belonging to the
       same main window (tkwin).  It normally returns a token  for  the  named
       window,  but  if  no such window exists Tk_NameToWindow leaves an error
       message in interp->result and returns  NULL.   The  tkwin  argument  to
       Tk_NameToWindow  is  needed because path names are only unique within a
       single application hierarchy.  If, for example, a  single  process  has
       opened two main windows, each will have a separate naming hierarchy and
       the same path name might appear in each of the  hierarchies.   Normally
       tkwin is the main window of the desired hierarchy, but this need not be
       the case:  any window in the desired hierarchy may be used.

KEYWORDS

       name, path name, token, window

Tk                                                                  Tk_Name(3)