HP 3000 Manuals HP 3000 Manuals
Chapter 8 Writing to a File
This chapter describes, through program examples, various ways that you
can use file system intrinsics to transfer data from your program to a
disk file or a device file. This chapter is intended to illustrate
topics introduced in chapter 7, "Record Selection and Data Transfer".
This chapter is divided into the following topics:
* "Sequential Access and Random Access" discusses two common methods
of record selection and data transfer, and uses examples to
illustrate the use of the FWRITE and FWRITEDIR intrinsics.
* "Writing to $STDLIST" discusses how your program can use the PRINT
and FWRITE intrinsics to write data from your program to the
job/session standard list device, $STDLIST. An example illustrates
the use of the PRINT intrinsic to write a character string to
$STDLIST.
* "Writing Messages to the system console" discusses how your
program can send messages from your program to the system console,
and request a reply from the operator. Examples illustrate the
use of the PRINTOP and PRINTOPREPLY intrinsics.
* "Writing to a Magnetic Tape File" discusses how you can write data
to two kinds of magnetic tape files: unlabeled tape files and
labeled tape files. Examples illustrate the use of the FWRITE
intrinsic to write data to both types of tape files.
* "Writing a File Label to a Labeled Tape File" provides an example
of using the FWRITELABEL intrinsic to write a user-defined file
label to a labeled magnetic tape file.