Extra code

Extra code can be enabled using the Select Scan Devices widget. It is inserted in the scan macros when the scan is started. Figure 7.18 shows an example. The code is stored in the files
~/prog/Code_before.pl,
~/prog/Code_before_during.pl,
~/prog/Code_after_during.pl,
~/prog/Code_after.pl.

The ~/prog directory stores also the file versions, e.g.: ~/prog/Code_before_00001.pl.

Figure 7.18: An Extra Code Example

The treatment of the extra code files is very similar compared to virtual counters (see section 7.2.2):

• The extra code is read from a disk file and inserted into the scan macros when the scan is started.

• Apply overwrite the file and creates a new file version, e.g.: ~/prog/Code_before_00007.pl.

• Extra code is executed by an eval Perl statement. If the return code is 0, Online terminates the scan.