HP 3000 Manuals HP 3000 Manuals
An Example Application A sample of the application interrupt capability is as follows: A user signs on to HP Desk and runs an application program. The application program generates a report into an MPE file. It then sets the JCW HPDESKPROCCONTROL to the value of 4--which is the number of the Interrupt Mode being requested. After this, it writes some data to the HP Desk XDS. The filename of the report file is written to the filename parameter, a subject is written to the subject parameter and a flag called text_type is set to 1. The application then uses the ACTIVATE intrinsic to suspend itself (in the MPE sense) and reactivates its other process--HP Desk. HP Desk becomes active and checks the JCW HPDESKPROCCONTROL to find out what it is supposed to do. In this example, the JCW is set to 4 which is the Interrupt Mode that will copy an MPE file to the user's Work Area. HP Desk obtains the filename to copy from the XDS and notes that the report file should be treated as a text file (due to the text_type flag being set). HP Desk then copies the file into the Work Area using the subject provided in the XDS (since that is what Interrupt Mode 4 commands it to do). When it has done this HP Desk sets the JCW HPDESKERR to 0 if everything worked correctly, or to an error value if not. Finally HP Desk reactivates the application and suspends itself. The application program then becomes active and checks the value of the HPDESKERR JCW. If it is non-zero, the application should report this and attempt error handling, otherwise it terminates. Finally control returns to HP Desk. When the user enters the Work Area (unless already there) the report will be found ready for use in HP Desk.