| 1 | '\" |
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| 2 | '\" Copyright (c) 1994-1997 Sun Microsystems, Inc. |
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| 3 | '\" |
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| 4 | '\" See the file "license.terms" for information on usage and redistribution |
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| 5 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 6 | '\" |
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| 7 | '\" RCS: @(#) $Id: WrongNumArgs.3,v 1.12 2007/12/13 15:22:32 dgp Exp $ |
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| 8 | '\" |
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| 9 | .so man.macros |
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| 10 | .TH Tcl_WrongNumArgs 3 8.0 Tcl "Tcl Library Procedures" |
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| 11 | .BS |
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| 12 | .SH NAME |
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| 13 | Tcl_WrongNumArgs \- generate standard error message for wrong number of arguments |
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| 14 | .SH SYNOPSIS |
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| 15 | .nf |
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| 16 | \fB#include <tcl.h>\fR |
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| 17 | .sp |
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| 18 | \fBTcl_WrongNumArgs\fR(\fIinterp, objc, objv, message\fR) |
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| 19 | .SH ARGUMENTS |
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| 20 | .AS "Tcl_Obj *const" *message |
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| 21 | .AP Tcl_Interp interp in |
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| 22 | Interpreter in which error will be reported: error message gets stored |
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| 23 | in its result object. |
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| 24 | .AP int objc in |
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| 25 | Number of leading arguments from \fIobjv\fR to include in error |
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| 26 | message. |
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| 27 | .AP "Tcl_Obj *const" objv[] in |
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| 28 | Arguments to command that had the wrong number of arguments. |
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| 29 | .AP "const char" *message in |
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| 30 | Additional error information to print after leading arguments |
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| 31 | from \fIobjv\fR. This typically gives the acceptable syntax |
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| 32 | of the command. This argument may be NULL. |
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| 33 | .BE |
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| 34 | |
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| 35 | .SH DESCRIPTION |
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| 36 | .PP |
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| 37 | \fBTcl_WrongNumArgs\fR is a utility procedure that is invoked by |
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| 38 | command procedures when they discover that they have received the |
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| 39 | wrong number of arguments. \fBTcl_WrongNumArgs\fR generates a |
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| 40 | standard error message and stores it in the result object of |
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| 41 | \fIinterp\fR. The message includes the \fIobjc\fR initial |
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| 42 | elements of \fIobjv\fR plus \fImessage\fR. For example, if |
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| 43 | \fIobjv\fR consists of the values \fBfoo\fR and \fBbar\fR, |
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| 44 | \fIobjc\fR is 1, and \fImessage\fR is |
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| 45 | .QW "\fBfileName count\fR" |
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| 46 | then \fIinterp\fR's result object will be set to the following |
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| 47 | string: |
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| 48 | .CS |
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| 49 | wrong # args: should be "foo fileName count" |
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| 50 | .CE |
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| 51 | If \fIobjc\fR is 2, the result will be set to the following string: |
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| 52 | .CS |
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| 53 | wrong # args: should be "foo bar fileName count" |
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| 54 | .CE |
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| 55 | \fIObjc\fR is usually 1, but may be 2 or more for commands like |
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| 56 | \fBstring\fR and the Tk widget commands, which use the first argument |
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| 57 | as a subcommand. |
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| 58 | .PP |
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| 59 | Some of the objects in the \fIobjv\fR array may be abbreviations for |
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| 60 | a subcommand. The command |
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| 61 | \fBTcl_GetIndexFromObj\fR will convert the abbreviated string object |
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| 62 | into an \fIindexObject\fR. If an error occurs in the parsing of the |
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| 63 | subcommand we would like to use the full subcommand name rather than |
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| 64 | the abbreviation. If the \fBTcl_WrongNumArgs\fR command finds any |
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| 65 | \fIindexObjects\fR in the \fIobjv\fR array it will use the full subcommand |
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| 66 | name in the error message instead of the abbreviated name that was |
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| 67 | originally passed in. Using the above example, let us assume that |
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| 68 | \fIbar\fR is actually an abbreviation for \fIbarfly\fR and the object |
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| 69 | is now an indexObject because it was passed to |
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| 70 | \fBTcl_GetIndexFromObj\fR. In this case the error message would be: |
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| 71 | .CS |
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| 72 | wrong # args: should be "foo barfly fileName count" |
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| 73 | .CE |
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| 74 | |
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| 75 | .SH "SEE ALSO" |
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| 76 | Tcl_GetIndexFromObj |
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| 77 | |
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| 78 | .SH KEYWORDS |
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| 79 | command, error message, wrong number of arguments |
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