|
|||
Download User Info New User FAQ Tutorials Demos Commands Variables Troubleshooting Sysop Info Sysop FAQ Theory Installation Management Tests Troubleshooting Feedback Resources Release Notes Credits Disclaimer |
Synopsis * Description * Keywords Generate an error
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:
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.
error, errorCode, errorInfo
|
||
Copyright © 1995-1999 NeoSoft Inc., 1770 St. James Place, Suite 500, Houston, TX 77056 USA. All Rights Reserved |