183 lines
6.9 KiB
HTML
183 lines
6.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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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="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Using Session I/O APIs</title>
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<!-- Begin Header Records ========================================= -->
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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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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!-- DSMMST1 SCRIPT A converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 29 Jan 1999 at 16:05:09 -->
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<!-- File Edited November 2001 -->
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<!-- End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>Using Session I/O APIs</h2>
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<h3><a name="HDRSSPERF">Performance Considerations</a></h3>
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<p>Specifying EBCDIC control-character options on the session description can
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incur overhead. Additional processing is required to handle these. Specifying
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the scroller line and character display as immediate can incur additional
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overhead. An output operation will occur for each line or group of characters
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written. If you need to write multiple lines to the scroller, you can achieve
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better performance by delaying line display until all the lines are written.
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Then you can use the Display Scroller Bottom (QsnDspSclB) API to display the
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data on the screen.</p>
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<br>
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<h3><a name="HDRSSEX">Create Session and Read Data--Example</a></h3>
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<p>The sample program in Figure 1 shows how to create and read data from a
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session. The resulting screen output is shown in <a href="#FIGSSEX1A">Figure 2</a>.</p>
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<p><strong><a name="FIGSSEX1">Figure 1. Program for Creating a Session and
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Reading Data</a></strong></p>
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<pre>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "qsnapi.h"
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#define TRUE 1
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#define FALSE 0
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#define PF1 "PF4 - Move PF5 - Resize"
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#define PF2 "PF6 - Print"
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typedef struct {
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Qsn_Ssn_Desc_T sess_desc;
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char buffer[100];
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} storage_t;
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int main (void)
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{
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Qsn_Inp_Buf_T ibuf = 0;
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char *fld_dta;
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int i;
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char text[100];
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storage_t storage;
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Qsn_Ssn_T session1;
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Qsn_Ssn_Desc_T *sess_desc = (Qsn_Ssn_Desc_T *) &storage;
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Qsn_Win_Desc_T win_desc;
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Q_Bin4 win_desc_length = sizeof(win_desc);
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char *pf1 = PF1;
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Q_Bin4 pf1_len = sizeof(PF1) - 1;
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char *pf2 = PF2;
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Q_Bin4 pf2_len = sizeof(PF2) - 1;
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Q_Bin4 sess_desc_length = sizeof(Qsn_Ssn_Desc_T) + pf1_len +
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pf2_len;
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/* initialize and set up session and window descriptions */
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QsnInzSsnD( sess_desc, sess_desc_length, NULL);
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QsnInzWinD( &win_desc, win_desc_length, NULL);
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sess_desc->cmd_key_desc_line_1_offset = sizeof(Qsn_Ssn_Desc_T);
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sess_desc->cmd_key_desc_line_1_len = pf1_len;
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memcpy( storage.buffer, pf1, pf1_len );
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sess_desc->cmd_key_desc_line_2_offset = sizeof(Qsn_Ssn_Desc_T) +
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pf1_len;
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sess_desc->cmd_key_desc_line_2_len = pf2_len;
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memcpy( storage.buffer + pf1_len, pf2, pf2_len );
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sess_desc->scl_line_dsp = '1';
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sess_desc->scl_chr_dsp = '1';
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sess_desc->num_input_line_rows = 2;
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sess_desc->wrap = '0';
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QsnCrtSsn( sess_desc, sess_desc_length, NULL, 0, '1',
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&win_desc, win_desc_length, NULL, 0,
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&session1, NULL);
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if (ibuf == 0)
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ibuf = QsnCrtInpBuf(100, 50, 0, NULL, NULL);
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while ( TRUE ) {
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QsnReadSsnDta( session1, ibuf, NULL, NULL);
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/* check if any data read, then end if exit entered */
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if ( (fld_dta=QsnRtvFldDta(ibuf, NULL, NULL)) != NULL) {
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if (strncmp(fld_dta, "exit", 4) == 0)
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break;
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}
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}
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}
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</pre>
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<br>
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<br>
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<p><strong><a name="FIGSSEX1A">Figure 2. Screen Output from Create Session
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Program</a></strong></p>
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<table border>
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<tr>
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<td>
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<pre>
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+--------------------------------------------------------------------------------+
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| ..............................................................................|
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| : ===> __________________________________________________________________:|
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| : ________________________________________________________________________ :|
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| : F4=Move F5=Resize :|
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| : F6=Print :|
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| : :|
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| :............................................................................:|
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+--------------------------------------------------------------------------------+
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</pre>
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<br>
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</td>
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</tr>
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</table>
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<br>
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<br>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center">
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<a href="#Top_Of_Page">Top</a> |
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<a href="dsm.htm">Dynamic Screen Manager APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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