SNGCHCFLD/MLTCHCFLD DSPF Keywords
The question asked was "How can I use the keywords SNGCHCFLD/MLTCHCFLD in protected mode?"
I had never used these pseudo graphical 5250 features, so all I could initially do was point to the IBM documentation for SNGCHCFLD (Single-Choice Selection Field) and MLTCHCFLD (Multiple-Choice Selection Field) keywords.
Another user pointed to the CHCCTL documentation.
I remembered that the late Booth Martin had extensive DSPF examples at his website.
Based on what Booth had done, I created this program to demonstrate what could be done to hide and protect single choice selections fields.
When program BOOTH is called, the display looks like this, with Choice 7 already selected by default:
Select a choice with your mouse, or using the down and up arrow keys and the space bar.
Selecting Choice 2 and pressing enter show this:
Every other time you press enter Choice 6 appears or disappears, by flipping *IN01.
If you clear the default selection and make no selection, then zero is returned for that choice:
Booth.DSPF
The display file.
Booth.RPGLE
A minimal program to drive the display file, deliberatly kept short.