231 lines
9.5 KiB
HTML
231 lines
9.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Working with stream files" />
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<meta name="abstract" content="This ILE C program opens an existing stream file, creates or replaces a database file, reads from the stream file and writes to the database file until end-of-file, and closes both files." />
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<meta name="description" content="This ILE C program opens an existing stream file, creates or replaces a database file, reads from the stream file and writes to the database file until end-of-file, and closes both files." />
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<meta name="DC.Relation" scheme="URI" content="apiexmp.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="apiexwofil" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Working with stream files</title>
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</head>
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<body id="apiexwofil"><a name="apiexwofil"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Working with stream files</h1>
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<div><p>This ILE C program opens an existing stream file, creates or replaces
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a database file, reads from the stream file and writes to the database file
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until end-of-file, and closes both files.</p>
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<div class="section"><p>The program uses the following hierarchical file system (HFS)
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APIs:</p>
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<ul><li>Create Directory (QHFCRTDR) </li>
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<li>Open Stream File (QHFOPNSF) </li>
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<li>Read from Stream File (QHFRDSF) </li>
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<li>Close Stream File (QHFCLOSF)</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code license and disclaimer information</a> for important
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legal information.</div>
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<pre>/********************************************************************/
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/* Program Name: HFSCOPY */
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/* Language : ILE C */
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/* Description : This program will do the following: */
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/* -- Create or replace a stream file */
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/* -- Create or replace a database file */
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/* -- Read from the stream file and write to the */
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/* database file until EOF */
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/* -- Close both files when done */
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/* APIs Used : QHFCRTDR, QHFOPNSF, QHFRDSF, QHFCLOSF */
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/********************************************************************/
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/********************************************************************/
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/* Include files */
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/********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <qhfopnsf.h>
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#include <qhfrdsf.h>
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#include <qhfclosf.h>
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#include <qhfcrtdr.h>
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#include <qusec.h>
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/********************************************************************/
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/* Structure and variable definitions */
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/********************************************************************/
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#define ON 1
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#define OFF 0
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typedef struct error_code_struct {
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Qus_EC_t EC;
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char exception_data[256];
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}error_code_struct;
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error_code_struct error_code;
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char file_handle[16];
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char path_name[30];
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char open_info[10];
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char attrib_info;
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char action;
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char read_buffer[80];
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int path_length;
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int attrib_length = 0;
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int bytes_to_read;
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int bytes_read = 0;
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int end_file;
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int cmpgood;
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FILE *FP;
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/*********************************************************************/
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/*printErrCode: Routine to print the error code structure */
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/*********************************************************************/
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void printErrCode(error_code_struct *theErrCode)
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{
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int i;
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char *tempptr = theErrCode->EC.Exception_Id;
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printf("Bytes Provided -> %d\n",theErrCode->EC.Bytes_Provided);
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printf("Bytes Available -> %d\n",theErrCode->EC.Bytes_Available);
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printf("Exception ID -> ");
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for (i=0;i<7 ;i++,tempptr++ )
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{
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putchar(*tempptr);
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}
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putchar('\n');
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}
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/********************************************************************/
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/* Start of code */
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/********************************************************************/
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main()
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{
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error_code.EC.Bytes_Provided = 116;
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/********************************************************************/
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/* Create the directory */
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/********************************************************************/
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strcpy(path_name,"/QDLS/HFSFLR");
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path_length = strlen(path_name);
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QHFCRTDR(path_name,path_length,&attrib_info,attrib_length,&error_code);
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if ( error_code.EC.Bytes_Available != 0 )
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{
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if (!memcmp(error_code.EC.Exception_Id,"CPF1F04",7))
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printf("Directory HFSFLR already created.\n");
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else
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{
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printErrCode(&error_code);
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exit(1);
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}
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}
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/********************************************************************/
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/* Open the stream file */
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/********************************************************************/
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strcpy(open_info,"210 120 "); /* Create or replace the file */
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strcpy(path_name,"/QDLS/HFSFLR/SAMPLE.HFS");
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path_length = strlen(path_name);
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printf("OPEN STREAM FILE:\n ");
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QHFOPNSF(&file_handle,
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path_name,
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path_length,
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open_info,
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&attrib_info,
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attrib_length,
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&action,
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&error_code);
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if (error_code.EC.Bytes_Available != 0)
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{
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printErrCode(&error_code);
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exit(1);
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}
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/********************************************************************/
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/* Open a database file */
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/********************************************************************/
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system("CRTLIB LIB(HFSLIB)");
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if (( FP = fopen("HFSLIB/HFSFILE(SAMPLE)","wb")) == NULL)
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{
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printf("Cannot open HFSLIB/HFSFILE(SAMPLE)\n");
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exit(1);
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}
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/********************************************************************/
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/* Loop through reading from the stream file and writing to the */
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/* database file. */
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/********************************************************************/
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end_file = OFF;
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while (end_file == OFF)
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{
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/*************************************************************/
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/* Read 80 bytes from the stream file */
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/*************************************************************/
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bytes_to_read = 80;
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printf("READ STREAM FILE:\n ");
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QHFRDSF(&file_handle,
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read_buffer,
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bytes_to_read,
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&bytes_read,
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&error_code);
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if (error_code.EC.Bytes_Available != 0)
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{
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cmpgood = strncmp("CPF1F33",error_code.EC.Exception_Id,7);
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if (cmpgood != 0)
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printErrCode(&error_code);
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end_file = ON;
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}
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else
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{
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printf("BYTES READ: %d\n ",bytes_read);
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printf("READ BUFFER: %s\n",read_buffer);
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if (bytes_read < bytes_to_read)
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{
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end_file = ON;
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/*******************************************************/
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/* Write remaining bytes to the database file */
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/*******************************************************/
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if (bytes_read > 0)
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fwrite(read_buffer,1,bytes_read,FP);
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}
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}
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}
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/********************************************************************/
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/* Close the stream file */
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/********************************************************************/
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printf("CLOSE STREAM FILE:\n ");
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QHFCLOSF(&file_handle,
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&error_code);
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if (error_code.EC.Bytes_Available != 0)
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printErrCode(&error_code);
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/********************************************************************/
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/* Close the database file */
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/********************************************************************/
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fclose(FP);
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}</pre>
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<p>To create the program using ILE C, specify the following:</p>
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<pre>CRTBNDC PGM(QGPL/HFSCOPY) SRCFILE(QGPL/QCSRC)</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="apiexmp.htm" title="Contains example programs that use APIs and exit programs.">Examples: APIs</a></div>
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</div>
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</div>
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</body>
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</html>
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