NAME

       Tcl_WrongNumArgs - generate standard error message for wrong number of arguments

SYNOPSIS

       #include <tcl.h>

       Tcl_WrongNumArgs(interp, objc, objv, message)

ARGUMENTS

       Tcl_Interp interp (in)                Interpreter  in  which error will be reported: error
                                             message gets stored in its result value.

       int objc (in)                         Number of leading arguments from objv to include  in
                                             error message.

       Tcl_Obj *const objv[] (in)            Arguments  to  command  that had the wrong number of
                                             arguments.

       const char *message (in)              Additional error information to print after  leading
                                             arguments  from  objv.   This  typically  gives  the
                                             acceptable syntax of the command.  This argument may
                                             be NULL.
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DESCRIPTION

       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 value 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 “fileName count” then
       interp's result value will be set to the following string:

              wrong # args: should be "foo fileName count"

       If objc is 2, the result will be set to the following string:

              wrong # args: should be "foo bar 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.

       Some  of  the values in the objv array may be abbreviations for a subcommand.  The command
       Tcl_GetIndexFromObj will convert the abbreviated string value 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 value 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"

SEE ALSO

       Tcl_GetIndexFromObj(3tcl)

KEYWORDS

       command, error message, wrong number of arguments