On Apache/2.4.6 (CentOS)
Under GNU General Public License
2025-06-23 22:06 @127.0.0.1 CrawledBy Wget/1.21.2
error(n) Tcl Built-In Commands error(n)
_________________________________________________________________________________________________
NAME
error - Generate an error
SYNOPSIS
error message ?info? ?code?
_________________________________________________________________
DESCRIPTION
Returns a TCL_ERROR code, which causes command interpretation to be unwound. Message is a
string that is returned to the application to indicate what went wrong.
The -errorinfo return option of an interpreter is used to accumulate a stack trace of what
was in progress when an error occurred; as nested commands unwind, the Tcl interpreter
adds information to the -errorinfo return option. If the info argument is present, it is
used to initialize the -errorinfo return options and the first increment of unwind infor-
mation will not be added by the Tcl interpreter. In other words, the command containing
the error command will not appear in the stack trace; in its place will be info. Histori-
cally, this feature had been most useful in conjunction with the catch command: if a
caught error cannot be handled successfully, info can be used to return a stack trace
reflecting the original point of occurrence of the error:
catch {...} errMsg
set savedInfo $::errorInfo
...
error $errMsg $savedInfo
When working with Tcl 8.5 or later, the following code should be used instead:
catch {...} errMsg options
...
return -options $options $errMsg
If the code argument is present, then its value is stored in the -errorcode return option.
The -errorcode return option is intended to hold a machine-readable description of the
error in cases where such information is available; see the return manual page for infor-
mation on the proper format for this option's value.
EXAMPLE
Generate an error if a basic mathematical operation fails:
if {1+2 != 3} {
error "something is very wrong with addition"
}
SEE ALSO
catch(n), return(n)
KEYWORDS
error
Tcl error(n)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/2.4.6 (CentOS)
Under GNU General Public License
2025-06-23 22:06 @127.0.0.1 CrawledBy Wget/1.21.2