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tkerror(n) [osx man page]

tkerror(n)						       Tk Built-In Commands							tkerror(n)


tkerror - Command invoked to process background errors SYNOPSIS
tkerror message _________________________________________________________________ DESCRIPTION
Note: as of Tk 4.1 the tkerror command has been renamed to bgerror because the event loop (which is what usually invokes it) is now part of Tcl. For backward compatibility the bgerror provided by the current Tk version still tries to call tkerror if there is one (or an auto loadable one), so old script defining that error handler should still work, but you should anyhow modify your scripts to use bgerror instead of tkerror because that support for the old name might vanish in the near future. If that call fails, bgerror posts a dialog show- ing the error and offering to see the stack trace to the user. If you want your own error management you should directly override bgerror instead of tkerror. Documentation for bgerror is available as part of Tcl's documentation. KEYWORDS
background error, reporting Tk 4.1 tkerror(n)

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bgerror(n)						       Tcl Built-In Commands							bgerror(n)


bgerror - Command invoked to process background errors SYNOPSIS
bgerror message _________________________________________________________________ DESCRIPTION
The bgerror command doesn't exist as built-in part of Tcl. Instead, individual applications or users can define a bgerror command (e.g. as a Tcl procedure) if they wish to handle background errors. A background error is one that occurs in an event handler or some other command that didn't originate with the application. For example, if an error occurs while executing a command specified with the after command, then it is a background error. For a non-background error, the error can simply be returned up through nested Tcl command evaluations until it reaches the top-level code in the application; then the application can report the error in whatever way it wishes. When a background error occurs, the unwinding ends in the Tcl library and there is no obvious way for Tcl to report the error. When Tcl detects a background error, it saves information about the error and invokes the bgerror command later as an idle event handler. Before invoking bgerror, Tcl restores the errorInfo and errorCode variables to their values at the time the error occurred, then it invokes bgerror with the error message as its only argument. Tcl assumes that the application has implemented the bgerror command, and that the command will report the error in a way that makes sense for the application. Tcl will ignore any result returned by the bgerror command as long as no error is generated. If another Tcl error occurs within the bgerror command (for example, because no bgerror command has been defined) then Tcl reports the error itself by writing a message to stderr. If several background errors accumulate before bgerror is invoked to process them, bgerror will be invoked once for each error, in the order they occurred. However, if bgerror returns with a break exception, then any remaining errors are skipped without calling bgerror. Tcl has no default implementation for bgerror. However, in applications using Tk there is a default bgerror procedure which posts a dialog box containing the error message and offers the user a chance to see a stack trace showing where the error occurred. In addition to allow- ing the user to view the stack trace, the dialog provides an additional application configurable button which may be used, for example, to save the stack trace to a file. By default, this is the behavior associated with that button. This behavior can be redefined by setting the option database values *ErrorDialog.function.text, to specify the caption for the function button, and *ErrorDialog.function.command, to specify the command to be run. The text of the stack trace is appended to the command when it is evaluated. If either of these options is set to the empty string, then the additional button will not be displayed in the dialog. SEE ALSO
after(n), tclvars(n) KEYWORDS
background error, reporting Tcl 7.5 bgerror(n)
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