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Just if you have hundreds and thousands of array elements, with list you'd have to backslash-escape the newlines, while with bracing they need not. For example: set f [open "foo.dat" w] try { # Write various things to the file } finally { close $f } If an error occurs while writing, the finally clause Any "return", "break", or "continue" commands in the catchscript are handled as you'd expect. For example, the division example could be written as follows: proc div {a b} { try The trycatch package defines a general purpose exception-handling control structure on top of the standard "catch" command. have a peek here

An example for simple error handling is shown below − #!/usr/bin/tclsh proc Div {a b} { if {$b == 0} { error "Error generated by error" "Info String for error" 401 The onerr command is typically used within the catch clause of a try/catch statement to match and handle particular errors. For example, the above function could be rewritten as follows: proc div {a b} { try { return [expr {$a/$b}] } return "NaN" } If there's no error computing the quotient, DESCRIPTION Returns a TCL_ERROR code, which causes command interpretation to be unwound. http://wiki.tcl.tk/error

Tcl Error Handling

Or perhaps the code isn't being executed but rather is being analyzed by Nagelfar, which will surely take issue with the invalidity of the code. Getting Tcl/Tk Getting help Learning Tcl Tcl Dev Xchange About the Wiki Community Advocacy Conferences Chat, news, lists History Humor People Tcl websites Reference Companies Getting help Online books Online tutorials DESCRIPTION Most modern languages, from C++ to Java to Python, have some kind of exception-handling control structure, usually called something like "try". The syntax for each of these commands is shown below.

Electric car lease or buy? Menu Skip to content HomeMy Resume Tcl: How to Throw anException Leave a reply Many Tcl scripters know how to catch an exception, but not many know how to throw it. share|improve this answer answered Jan 21 '12 at 12:58 Donal Fellows 84.1k1294156 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Tcl Error Code If there's any doubt about the finality of the [return] (e.g.

If the problem is in your code, use error or throw. C++ Recursive variable declaration Life from a dead space whale more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile All rights reserved. Version 2.0 added the "try" and "try/finally" forms of the command, changed the syntax of the "catch" clause, and added the "throw" and "onerr" commands.

share|improve this answer edited Jun 21 '14 at 20:02 glenn jackman 125k1890168 answered Jun 21 '14 at 6:38 Donal Fellows 84.1k1294156 add a comment| up vote 1 down vote In TCL, Tcl Return Error Whether there is an error or not, however, the finallyscript is always executed. If it reaches the top level of script evaluation in tclsh, it will be printed on the console before, in the non-interactive case, causing an exit (the behavior in other programs If the "-info" option is given, its value is a variable name; the variable is set to that of the global "errorInfo" variable.

Tcl Throw Exception

Teh errorz iz atakkin! $msg" puts stderr $::errorInfo exit 1 } OK, if you're using 8.5 then a slightly better way to write that is: if {[catch {source realscript.tcl} msg resultdict]} The problem in that case is that the caller isn't obeying the interface contract, not that the implementation has gone wrong.RS 2001-11-21: In C, errors are something you loathe and try Tcl Error Handling instead of return -level 0 .... Tcl Error Command Typically the info value is supplied from the value left in $errorInfo when catch traps an error within the procedure.If -errorcode is specified, list provides a value for $errorCode.

If the "-code" option is given, its value is a variable name; the variable is set to that of the global "errorCode" variable. http://colinmeldrum.com/tcl-error/tcl-error-f5.html Have a poke around. The catch command returns 0 if there is no error, and 1 if there is an error. return -level 0 -code return has the same effect as return, as well as return -level 1 -code ok. (TCL_RETURN)3breakInstruct the next level up break out of the innermost nested loop Tcl Throw Example

The following three commands all effectively instruct the caller to return normally from the current procedure (level 1):return return -level 0 -code return return -level 1 -code okThe return value is What is Tk? If [return] is redefined, code following the [return] could certainly come into play. http://colinmeldrum.com/tcl-error/tcl-last-error.html throw {ARITH DIVZERO {divide by zero}} {divide by zero} SEE ALSO catch, error, errorCode, errorInfo, return, try KEYWORDS error, exception Copyright © 2008 Donal K.

Email check failed, please try again Sorry, your blog cannot share posts by email. %d bloggers like this: Tcl Warning Why are there no toilets on the starship 'Exciting Undertaking'? Python try: raise Exception("test") except Exception, e: print e What's the equivalent in expect? #!/usr/bin/expect package require Expect # raise and catch exception exception error-handling tcl expect share|improve this question edited

More importantly, return has the more general purpose of communicating information about some level to the interpreter.

How to properly localize numbers? return -level 0 -code error is the same as error. (TCL_ERROR)2returnInstruct the next level up to return. ex.what() changes in nested try-catch, C++ How many dimensions does electricity have? Tcl Catch Example Error syntax error message info code In the above error command syntax, message is the error message, info is set in the global variable errorInfo and code is set in the

Catch Syntax catch script resultVarName In the above catch command syntax, script is the code to be executed, resultVarName is variable that holds the error or the result. return can be considered a sort of restricted uplevel that provides a flexible mechanism for expressing various runtime conditions. error $errMsg $savedInfo If the code argument is present, then its value is stored in the errorCode global variable. http://colinmeldrum.com/tcl-error/tcl-tk-error.html If supplied, info is used to seed the errorInfo value, and code becomes the errorCode, which is otherwise NONE.error is short for return -level 0 -code error, which is not the

Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are Insert two pdf pages at the bottom Using US "chip & signature" Credit Cards abroad in "chip & PIN" countries What dice mechanic gives a bell curve distribution that narrows and Duquette. Use in pkgIndex.tcl editSee package index script interface guidelines for another use of return in source'd scripts: The main use for return outside procedures is in pkgIndex.tcl:if {![package vsatisfies [package provide

Description editGenerates an error with the specified message. A typical pattern might be for the first token to be the package name, and the second to be a code identifying the specific error. Is it possible to change the kernel in a UNIX/LINUX system?