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Tk_Name(3)                                  Tk Library Procedures                                 Tk_Name(3)



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NAME
       Tk_Name, Tk_PathName, Tk_NameToWindow - convert between names and window 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 reporting.

       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 identifies 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 created.  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  appli-cation application
       cation  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 a child of another window for nam-ing naming
       ing  purposes  if  the second window was named as the first window's parent 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 argu-ment) argument)
       ment) 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)