I've got an app that takes mag card swipes and barcode scans.

If a person gets "out of order", my QC logic will warn them and clear out the field. But if this is the result of an automatic scan, there still might be characters about to be sent to the field after I clear it out.

How do I drain the keyboard buffer?

And now I realize I'm working on the 1.1 framework, yet I'm releasing on 2.x.
Ow well - some to upgrade.

But I'm taking 2 mag swipes followed by a bar code on a production line.
Each field has a specific length that I stop at and validate the data (format, dupes, etc). I then jump to the next field.
After all three, I store into a database, log everything, clear out the fields, and prep for the next group.

The issue is when a person scans or swipes the wrong thing. Wrong length, bad validation, etc.

The goal is zero keyboard usage, but I can live with making them clear it out on error.