09-19-2007
Give some info
If you will help us !! We help you
Can you provide some more info with example and code as well
~~~Sanjay Tripathi~~~
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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.
If the info argument is provided and is non-empty, it is used to initialize the global variable errorInfo. errorInfo 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 errorInfo.
If the info argument is present, it is used to initialize errorInfo and the first increment of unwind information will not be added by the
Tcl interpreter. In other words, the command containing the error command will not appear in errorInfo; in its place will be info. This
feature is 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
If the code argument is present, then its value is stored in the errorCode global variable. This variable is intended to hold a machine-
readable description of the error in cases where such information is available; see the tclvars manual page for information on the proper
format for the variable. If the code argument is not present, then errorCode is automatically reset to ``NONE'' by the Tcl interpreter as
part of processing the error generated by the command.
SEE ALSO
catch(n), tclvars(n)
KEYWORDS
error, errorCode, errorInfo
Tcl error(n)