Tcl_WrongNumArgs(interp, objc, objv, message)
Tcl_WrongNumArgs is a utility procedure that is invoked by
command procedures when they discover that they have received the
wrong number of arguments. Tcl_WrongNumArgs generates a
standard error message and stores it in the result object of
interp. The message includes the objc initial
elements of objv plus message. For example, if
objv consists of the values foo and bar,
objc is 1, and message is
then interps result object will be set to the following
If objc is 2, the result will be set to the following string:
wrong # args: should be "foo fileName count"
Objc is usually 1, but may be 2 or more for commands like
string and the Tk widget commands, which use the first argument
as a subcommand.
wrong # args: should be "foo bar fileName count"
Some of the objects in the objv array may be abbreviations for
a subcommand. The command
Tcl_GetIndexFromObj will convert the abbreviated string object
into an indexObject. If an error occurs in the parsing of the
subcommand we would like to use the full subcommand name rather than
the abbreviation. If the Tcl_WrongNumArgs command finds any
indexObjects in the objv array it will use the full subcommand
name in the error message instead of the abbreviated name that was
originally passed in. Using the above example, let us assume that
bar is actually an abbreviation for barfly and the object
is now an indexObject because it was passed to
Tcl_GetIndexFromObj. In this case the error message would be:
wrong # args: should be "foo barfly fileName count"