Trapping errors

This page describes a simple error trapping scheme to allow you to trap error before a report is printed on paper.

You are free to develop your own methods for trapping error messages.

General

Our Superbase bar code function library references two global variables;

GLOBAL ErrorMsg$

GLOBAL HideErrors%%

If HideErrors%% <> 1 then bar code functions will output error messages (to window Bar code errors).

If HideErrors%% = 1 then bar code functions will hide error messages (no error messages are output).

If ErrorMsg$ = "" then bar code functions will set ErrorMsg$ to the error messages.

If ErrorMsg$ <> "" then bar code functions will not set ErrorMsg$.

Trapping errors in Superbase reports

Before you run the report, set HideErrors%% and set ErrorMsg$ to "".

    HideErrors%% = 1

    ErrorMsg$ = ""

When the report is running no error will be displayed.

When the report is complete, ErrorMsg$ will contain the first error found.

TIP: You can output a report to a window or temporary file, before you print the report on paper. In your code, if ErrorMsg$ is empty then the report will complete successfully when printed.

Trapping errors in Superbase programs

    ...

    HideErrors%% = 1

    ErrorMsg$ = ""


    REM This is the data to bar code

    B$ = "82402348"

    A$ = CIA_ITF$( B$ )


    REM If there is an error, display it

    IF ErrorMsg$ <> "" THEN
        ? ErrorMsg$
    END IF

    ...

Before you run the report, set ErrorMsg$ to "" and set HideErrors%% to 1.