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Tcl Get Error Info


Please think of the fact, that the executable is not maintained by us, it's a company external executable! Don't be afraid to do something wrong - it will most often deliver a helpful error message. If no error occurred, var is set to contain the result of executing the script. 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 http://colinmeldrum.com/tcl-error/tcl-last-error.html

On Windows or Mac, you might need to add the command console show to get the substitute console Tcl creates for you, when no real one is present. error message ?info? ?code? Please wait..." } retry count 2 { ... The syntax for each of these commands is shown below. https://www.tcl.tk/man/tcl8.5/tutorial/Tcl36.html

Tcl Error Command

throw }There is no throw command in Tcl [editors note: Of course there is one nowadays], so it is handled by unknown, which tries to load it from auto_index, and if The Tcl command proc itself doesn't complain if it is called with an existing name. The formatted stack trace is meant to be read by a person. What is Tk?

Fix (some regsub magic on 'name') left as an exercise. The value of the -errorstack entry surfaces as info errorstack. If however you feed this file directly to a tclsh, that fact is detected, and the "e.g." calls are executed. Tcl Error Code For this you need catch: if [catch {open $file r} result] { # error!

If the info argument is provided and is non-empty, it is used to initialize the global variable errorInfo. It is possible to "catch" errors and exceptions with the catch command, which runs some code, and catches any errors that code happens to generate. You can resize the whole thing with console eval {wm geometry . $Wx$H+$X+$Y} where $W and $H are dimensions in character cells (default 80x24), but $X and $Y are in pixels. http://wiki.tcl.tk/error When the file is loaded as part of a library, just the proc definitions are executed.

The signal Command signal action siglist ?command? Tcl Catch Exec Three other standard exceptions are: The return condition, generated by the return command. Error in shell bracket test when string is a left-parenthesis more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile Errors Many Tcl commands generate an error condition when there is a problem (command invoked with invalid arguments, runtime error, etc).

Tcl Error Handling

You may want to be sure to be able to perform some cleanup actions upon receipt of these signals; assuming you have a proc called cleanup that does what's necessary, you http://stackoverflow.com/questions/2193731/stack-trace-info-in-errorinfo-in-tcl The continue condition, generated by the continue command. Tcl Error Command Other kinds of result (including user-defined exception codes) do not cause the backtrace to be built.Tcl syntaxCategory DebuggingCategory Internals HomeRecent changesHelpWhoAmI/LogoutCreate new pageRandom pagePrevious pageNext pageAdd commentsEditHistoryEdit summaryReferences Getting started What Tcl Catch Example In other words, the command containing the error command will not appear in errorInfo; in its place will be info.

Tcl defines the normal return code from script evaluation to be zero (0), or TCL_OK. navigate here Can a PC change Backgrounds mid-campaign? In either case, a message will be placed in errorInfo, and the proc will generate an error. When a Tcl command or procedure encounters an error during its execution, the global variable errorInfo is set, and an error condition is generated. Errorinfo Tcl

if ![regexp {^[0-9]+$} $num] { error "num must be numeric" } error takes two optional arguments which we will discuss later. Debugging and Errors - errorInfo errorCode catch error return Previous lesson | Index | Next lesson In previous lessons we discussed how the return command could be used to return a An example is shown below − #!/usr/bin/tclsh catch {set file [open myNonexistingfile.txt]} result puts "ErrorMsg: $result" puts "ErrorCode: $errorCode" puts "ErrorInfo:\n$errorInfo\n" When the above code is executed, it produces the following http://colinmeldrum.com/tcl-error/tcl-error-out.html Evaluates and executes script.

And more again: you can even add widgets to the console - try console eval {pack [button .b -text hello -command {puts hello}]} The button appears between the text widget and Tcl Throw Error Let's just create a valid one: % proc hello {} {puts Hi!} Silently acknowledged. console eval {winfo children .} tells you more about the console widget: it is a toplevel with children .menu, .console (text), and .sb (scrollbar).

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.

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed EXAMPLESThe catch command may be used in an if to branch based on the success of a script. go

NAME SYNOPSIS DESCRIPTION EXAMPLES SEE ALSO KEYWORDS Documentation generated from fossil trunk NAME catch - Evaluate script and trap exceptional returns SYNOPSIS catch script Tcl Try Catch Example What are the downsides to multi-classing?

The stack trace only containing the calls between the catch statement and the error - which (like my first example) consists only of the call to four. if { [catch {open $someFile w} fid] } { puts stderr "Could not open $someFile for writing\n$fid" exit 1 } There are more complex examples of catch usage in the documentation Remote debugging[edit] Here's a simple experiment on how to connect two Tcl processes so that one (call it "debugger") can inspect and control the other ("debuggee"). this contact form If at some time you want to see details of what your program does, and at others not, you can define and redefine a dputs command that either calls puts or

Use at your own risk, of course...:^) The "debuggee" contains in my experiments the following code, in addition to its own: proc remo_server {{port 3456}} { set sock [socket -server remo_accept The body argument to catch is a Tcl script, which catch executes. If there is an error, default is returned (or the empty string, if default isn't specified). Here's a file that implements and demonstrates "e.g.": # PROLOG -- self-test: if this file is sourced at top level: if {[info exists argv0]&&[file tail [info script]] eq [file tail $argv0]}

Most useful knowledge from the 30's to understand current state of computers & networking? Feb 4 '10 at 4:18 ls's new answer (which should be an update to the original question) just confirms what I'm saying - catching close to the error site 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 Similarly, it is possible to catch the error generated by Tcl.

catch {return hey!} => 2 For most purposes, you can simply treat any non-zero exception as an error condition; the only time you need to worry about the distinction is when If seconds is 0.0, any previous alarm request is cancelled. Here is one way to add this functionality. By using this site, you agree to the Terms of Use and Privacy Policy.

This is meant to be in a format that is easy to parse with a script, so that Tcl scripts can examine the contents of this variable, and decide what to code must be one of: ok - Normal status return error - Proc returns error status return - Normal return break - Proc returns break status continue - Proc returns continue A tiny testing framework[edit] Bugs happen. In addition the standard exceptions, Tcl lets you define your own.

See below for examples. This command takes one mandatory argument, the error message; when invoked, it generates an error condition and terminates execution. Tcl packages may provide commands that set other entries in the dictionary of return options, and the return command may be used by scripts to set return options in addition to timeout is often useful in network programming, where long delays can occur.

return ?-code code? ?-errorinfo info? ?-errorcode errorcode? ?value?