Problem:

This project illustrates how to use Byte-stream File Routines to access and traverse an indexed file and summarize the records in the file by record code.

Routines used: CBL_OPEN_FILE, CBL_CLOSE_FILE, CBL_READ_FILE, CBL_START_FILE

Resolution:

INTRODUCTION

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This project illustrates how to use Byte-stream File Routines to access and traverse an indexed file and summarize the records in the file by record code.

SOURCE FILES:

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Program Files          Description

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XCreateFIDX.cbl     This program creates an indexed file (FLIndex.dat/.idx) containing thirteen

                                records. You can edit this file with the Data File Editor.

GetDeletes.cbl        This program handles the command line, verifies that the file to be processed

                                exists, handles error conditions and reports the record code summary. It calls

                                FileHDR.cbl to process the indexed file.

FileHDR.cbl             This program uses Byte-stream File Routines to read the indexed file header

                               and then read through the file summarizing the records in the file by record

                               code.

Copy Files:

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StandardFileHeader.cpy     This copy book defines the structure of the Standard File Header

                                            record that is  the first record of any indexed file. It also documents

                                            the potential values for each of the fields in the header.

REQUIREMENTS:

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Net Express 3.1 with Service Pack 1 was used to create this example.

OPERATION:

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The programs have all been compiled and tested. Animate the GetDeletes.cbl program to determine exactly how the file processing is accomplished.

REFERENCES:

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Documentation on Byte-stream File Routines can be found in Net Express Help by clicking on the Index tab and typing in "Byte-stream Routine", selecting the article with the same name in window 2 and clicking the Display button.

Documentation on Indexed File Formats and Structures can be found in Net Express Help by clicking on the Contents tab and opening these books: Reference> File Handling > File Structures > Files with Headers

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Keywords: demonstration, sample, example, demo, retrieve.zip

demo.ex

demo.me

demo.ne

demo.se

Attachments:

Retrieve.zip