HPlogo Accessing Files Programmer's Guide > Chapter 7 Record Selection and Data Transfer

Chapter 7 Record Selection and Data Transfer

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E0300 Edition 6 ♥
E0692 Edition 5

Table of Contents
Record Pointers
Record Selection
Sequential access
Random access
Update access
RIO access
Multiple Record Transfers
Control Operations
Spacing
Pointing
Rewinding
Magnetic Tape Considerations
The chief activities of the file system involve the transfer of data. In this chapter we will examine how this is accomplished. As you read this chapter, keep these considerations in mind:

  • How are records selected for transfer?

  • What intrinsics are used for data transfer?

  • How is the record pointer affected by intrinsics?

The last section of this chapter discusses the major points presented in this chapter as they pertain to magnetic tape files.



Closing a Magnetic Tape File

Record Pointers