1Tk_Name(3) Tk Library Procedures Tk_Name(3)
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6
8 Tk_Name, Tk_PathName, Tk_NameToWindow - convert between names and win‐
9 dow tokens
10
12 #include <tk.h>
13 Tk_Uid
15 Tk_Name(tkwin)
16 char *
18 Tk_PathName(tkwin)
19 Tk_Window
21 Tk_NameToWindow(interp, pathName, tkwin)
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24 Tk_Window tkwin (in) Token for window.
25 Tcl_Interp *interp (out) Interpreter to use for error report‐
27 ing.
28 const char *pathName (in) Character string containing path
30 name of window.
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34 Each window managed by Tk has two names, a short name that identifies a
35 window among children of the same parent, and a path name that identi‐
36 fies the window uniquely among all the windows belonging to the same
37 main window. The path name is used more often in Tk than the short
38 name; many commands, like bind, expect path names as arguments.
39 The Tk_Name macro returns a window's short name, which is the same as
41 the name argument passed to Tk_CreateWindow when the window was cre‐
42 ated. The value is returned as a Tk_Uid, which may be used just like a
43 string pointer but also has the properties of a unique identifier (see
44 the manual entry for Tk_GetUid for details).
45 The Tk_PathName macro returns a hierarchical name for tkwin. Path
47 names have a structure similar to file names in Unix but with dots be‐
48 tween elements instead of slashes: the main window for an application
49 has the path name “.”; its children have names like “.a” and “.b”;
50 their children have names like “.a.aa” and “.b.bb”; and so on. A win‐
51 dow is considered to be a child of another window for naming purposes
52 if the second window was named as the first window's parent when the
53 first window was created. This is not always the same as the X window
54 hierarchy. For example, a pop-up is created as a child of the root
55 window, but its logical parent will usually be a window within the ap‐
56 plication.
57 The procedure Tk_NameToWindow returns the token for a window given its
59 path name (the pathName argument) and another window belonging to the
60 same main window (tkwin). It normally returns a token for the named
61 window, but if no such window exists Tk_NameToWindow leaves an error
62 message in interpreter interp's result and returns NULL. The tkwin ar‐
63 gument to Tk_NameToWindow is needed because path names are only unique
64 within a single application hierarchy. If, for example, a single
65 process has opened two main windows, each will have a separate naming
66 hierarchy and the same path name might appear in each of the hierar‐
67 chies. Normally tkwin is the main window of the desired hierarchy, but
68 this need not be the case: any window in the desired hierarchy may be
69 used.
70
72 name, path name, token, window
73Tk Tk_Name(3)