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This chapter provides an introduction to HLLAPI. The following topics are included:
What is HLLAPI?
How HLLAPI works
Typical uses of HLLAPI
HLLAPI (High-Level Language Application Programming Interface) enables you to write C language application programs that use the 3270 emulation program to communicate with a mainframe computer. HLLAPI and the Host Application, shows the relationship between the HLLAPI application program, the 3270 emulation program, and the host 3270 application.
The screen and keyboard are not necessarily required; the HLLAPI application may perform all interaction with the host application without the need for intervention by a 3270 user, or may provide a user interface to the host application. This means that users of a HLLAPI application interact only with that application and need not be aware that the application is making use of host facilities. In general, a HLLAPI application will lock the 3270 session to prevent any user input direct to the 3270 session, and all communications with the 3270 emulation program will be by means of the HLLAPI application.
Data can be sent to a host application and accessed later by applications both on the host and on the Solaris computer. For example, data sent to a host for storage can be retrieved as needed and used in spreadsheet software or word-processing packages. Application programs can use HLLAPI functions to monitor the host computer to determine when the host is not available.
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