IBM Tivoli NetView for z/OS Programming: Pipes - IBM notice

Full-Screen Automation
332 Programming: Pipes
and processing continues. If BNH150I was not returned, an error was
detected. No further processing is done on the main menu panel.
▌4▐ If the timeout message DWO369I is generated, an error has occurred
during CORRWAIT. In this simple example, the error is captured.
▌5▐ Messages not selected by LOCATE 1.7 /DWO369I/ are passed as an input
stream to the connector A:. The messages are then written to the variable
npdamsg. HALERT terminates if messages are contained in the npdamsg
variable.
▌6▐ The VET command is used to type /ALH/ on the NPDA command line.
The default action key, ENTER, is passed to NPDA. NPDA responds as
though the command ALH was entered on a terminal by a NetView
operator.
▌7▐ There can be many pages of alert history. The last page of alert history is
determined by finding PAGE x OF x on the NPDA panel, where x is the
total number of alert history pages.
▌8▐ VET NEXT ROWS collected a screen image from NPDA. This time we
want to examine the screen image. Messages, other than BNH150I, are
handled by the simple pipe connected with the SC: connector.
▌9▐ After the data from this panel is reported to the caller of the example
procedure, one line is reserved to trigger a command.
▌10▐ A VET command ignores the line used to trigger it. /FORWARD/ is
passed to NPDA with an Enter action key. If VET is coded as a stage,
instead of a command, it is a subsequent stage and attempts to write the
data line passed from TAKE 1 to the NPDA screen.