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| Syntax |
errortraptrap) |
| See Also | error , help , halt , stop |
errortrap function enables a program written in
O-Matrix to translate an O-Matrix error message to
something more useful to the person running a particular O-Matrix program.
errortrap
errortrap, error trapping is turned off and the normal
O-Matrix error dialog is used.
errortrap(function )
Sets up the function trap as the transfer point
if and when an error occurs.
If an error occurs after a call of this form,
all active function calls are aborted,
all active include
files are aborted,
and the trap function is called with the
parameters described below:
(topic, msg)
The argument topic is a character row vector containing the
O-Matrix help topic that corresponds to the help button in the
normal error dialog.
The argument msg is a character matrix containing the
message that the normal dialog would display.
clear
ExtraInformation = novalue
function trap(topic, msg) begin
global ExtraInformation
print ExtraInformation
print msg
end
errortrap(function trap)
Suppose that the file TEMP.DAT contains the following text
1 2 3 4
5 6 ; 8
If you enter the error handler above and then enter
ExtraInformation = "Reading input data file:"
read("TEMP.DAT", "int", 2, 4)
O-Matrix will print the following in the Command window
Reading input data file:
read: invalid character for int type
Line 2 File C:\OMWIN\TEMP.DAT
Executing at or below line 22 in file
command line
19 end
20 errortrap(function trap)
21 ExtraInformation = "Reading input data file:"
-> read("TEMP.DAT", "int", 2, 4)
23
(the line numbers will be different).
You can restore normal error processing by entering:
errortrap