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Tcl_WrongNumArgs(3)                        Tcl Library Procedures                        Tcl_WrongNumArgs(3)



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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 object.

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

       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  mes-sage message
       sage 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 "fileName count" then interp's result object 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 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"


SEE ALSO
       Tcl_GetIndexFromObj


KEYWORDS
       command, error message, wrong number of arguments



Tcl                                                  8.0                                 Tcl_WrongNumArgs(3)