80 lines
2.8 KiB
Groff
80 lines
2.8 KiB
Groff
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'\"
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'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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.TH Tcl_WrongNumArgs 3 8.0 Tcl "Tcl Library Procedures"
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.so man.macros
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.BS
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.SH NAME
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Tcl_WrongNumArgs \- generate standard error message for wrong number of arguments
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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\fBTcl_WrongNumArgs\fR(\fIinterp, objc, objv, message\fR)
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.SH ARGUMENTS
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.AS "Tcl_Obj *const" *message
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.AP Tcl_Interp interp in
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Interpreter in which error will be reported: error message gets stored
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in its result value.
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.AP int objc in
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Number of leading arguments from \fIobjv\fR to include in error
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message.
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.AP "Tcl_Obj *const" objv[] in
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Arguments to command that had the wrong number of arguments.
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.AP "const char" *message in
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Additional error information to print after leading arguments
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from \fIobjv\fR. This typically gives the acceptable syntax
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of the command. This argument may be NULL.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTcl_WrongNumArgs\fR is a utility procedure that is invoked by
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command procedures when they discover that they have received the
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wrong number of arguments. \fBTcl_WrongNumArgs\fR generates a
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standard error message and stores it in the result value of
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\fIinterp\fR. The message includes the \fIobjc\fR initial
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elements of \fIobjv\fR plus \fImessage\fR. For example, if
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\fIobjv\fR consists of the values \fBfoo\fR and \fBbar\fR,
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\fIobjc\fR is 1, and \fImessage\fR is
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.QW "\fBfileName count\fR"
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then \fIinterp\fR's result value will be set to the following
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string:
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.PP
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.CS
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wrong # args: should be "foo fileName count"
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.CE
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.PP
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If \fIobjc\fR is 2, the result will be set to the following string:
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.PP
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.CS
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wrong # args: should be "foo bar fileName count"
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.CE
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.PP
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\fIObjc\fR is usually 1, but may be 2 or more for commands like
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\fBstring\fR and the Tk widget commands, which use the first argument
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as a subcommand.
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.PP
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Some of the values in the \fIobjv\fR array may be abbreviations for
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a subcommand. The command
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\fBTcl_GetIndexFromObj\fR will convert the abbreviated string value
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into an \fIindexObject\fR. If an error occurs in the parsing of the
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subcommand we would like to use the full subcommand name rather than
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the abbreviation. If the \fBTcl_WrongNumArgs\fR command finds any
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\fIindexObjects\fR in the \fIobjv\fR array it will use the full subcommand
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name in the error message instead of the abbreviated name that was
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originally passed in. Using the above example, let us assume that
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\fIbar\fR is actually an abbreviation for \fIbarfly\fR and the value
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is now an \fIindexObject\fR because it was passed to
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\fBTcl_GetIndexFromObj\fR. In this case the error message would be:
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.PP
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.CS
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wrong # args: should be "foo barfly fileName count"
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.CE
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.SH "SEE ALSO"
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Tcl_GetIndexFromObj(3)
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.SH KEYWORDS
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command, error message, wrong number of arguments
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