IBM Mainframe Forum

Sorry if there's a better place to post this, but I couldn't find a forum for EHLLAPI, and this looked as a close as any other on this site.

My EHLLAPI program occasionally appears to return a partial PRESENTATION SPACE when "Copy Presentation Space (5)" function is called after sending "ENTER" to the mainframe screen. It looks like it's just not waiting for the mainframe screen to completely refresh before it tries to get the presentation space, so sometimes I get either the previous screen buffer or part of the next screen.

How can I ensure PCOM has completed processing and fully loaded the next mainframe screen?

Hello and welcome to the forum,

This is as close as we have, i believe
If you'd like to have this moved later, just post a reply and it can be relocated.

Suggest you check the PCOM documentation for a way to delay using the "screen data" until the mainframe replies (rather than while the transaction is still "in flight"). None of my current clients uses PCOM.

If the documentation helped, I wouldn't ask.

Is there no EHLLAPI forum?

Hello,

Is there no EHLLAPI forum?

None that i'm aware of.

We do have a section for "Simulators & Emulators", but i see no topics about EHLLAPI posted there.

What does PCOM support have to say?

Too bad! I've usually found the user community to be very helpful with such issues, whereas the vendor is likely to deny the problem exists even in the face of the facts.

Thanks!

We can only help if we have experienced the problem you describe. I did not even know what EHLLAPI was until I googled just now and I have worked in a number of places that use PCOMM. There is a lot of reading there and I do not intend to go through it as I have no way to test any solutions I could come up with. I know that this does not help you but it does, perhaps, explain why there has been no help for your problem.

RonNoSpam wrote:Sorry if there's a better place to post this, but I couldn't find a forum for EHLLAPI, and this looked as a close as any other on this site.

My EHLLAPI program occasionally appears to return a partial PRESENTATION SPACE when "Copy Presentation Space (5)" function is called after sending "ENTER" to the mainframe screen. It looks like it's just not waiting for the mainframe screen to completely refresh before it tries to get the presentation space, so sometimes I get either the previous screen buffer or part of the next screen.

How can I ensure PCOM has completed processing and fully loaded the next mainframe screen?

Take a look at the EHLLAPI Wait function. From the reference site (http://publib.boulder.ibm.com/infocenter/pcomhelp/v5r9/index.jsp?topic=/com.ibm.pcomm.doc/books/html/emulator_programming08.htm, a direct link to the function doesn't work. Click on "EHLLAPI Functions", then on "Wait (4)"):

"The Wait function checks the status of the host-connected presentation space. If the session is waiting for a host response (indicated by XCLOCK (X []) or XSYSTEM), the Wait function causes EHLLAPI to wait up to 1 minute to see if the condition clears."

Basically, this function will wait until the system is ready for input. So, I'd write a loop that runs until the Wait function returns 0 (The system is ready for input).