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The HPFOPEN intrinsic is the recommended intrinsic for creating and
opening files on an MPE/iX-based computer system. HPFOPEN is designed
to be more flexible and extendible than the FOPEN intrinsic. In
addition, HPFOPEN's available options are a superset of the options
available through FOPEN. For example, mapped access is available
through HPFOPEN but not through FOPEN.
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NOTE: One HPFOPEN option, the
file privilege option, when used to set a new file's privilege
level to other than 3 (least-privileged, or user level), disallows all
subsequent access of that file by the FOPEN intrinsic. (For
compatibility reasons, FOPEN can only access a file whose file
privilege level is three.)
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You should use the FOPEN intrinsic only if you are planning to migrate
your application between MPE/iX-based systems and MPE V/E-based systems.
HPFOPEN is not supported on an MPE V/E-based system.
The examples in this chapter illustrate the use of the HPFOPEN
intrinsic. The HPFOPEN intrinsic uses an itemnum, item
pair convention for optional parameter passing. The itemnum and
item parameters are paired, where the nth
itemnum is immediately followed in the parameter list by the
nth item. The itemnum parameter
passes by value an integer that the intrinsic uses to define the meaning and
expected data type of the value passed by reference in the corresponding
item parameter.
For details on HPFOPEN and FOPEN parameters, refer to the
respective intrinsics descriptions in the MPE/iX Intrinsics Reference
Manual.
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