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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_200
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263_01
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dbupdate.c
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1990-02-14
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#include <stdio.h>
#include <c_wndw.h>
#include <c_ndx.h>
struct MAP {int field, col;};
void setup (int, struct DBF_DEF*, struct MAP*);
void record_display (int, struct MAP*, int);
int record_accept (int, struct MAP*, int);
/*
* Copyright 1989, Marietta Systems, Inc.
* All rights reserved
*/
/*
* * * * * * * * * * * * *
* This function builds the entry control map array for the entry
* of the fields.
*/
void setup (int fh, struct DBF_DEF *dict, struct MAP *map)
{
int col = 1, i;
/* get the field numbers from data dictionary */
map[0].field = dbffield (fh, "FIRSTNAME");
map[1].field = dbffield (fh, "INITIAL");
map[2].field = dbffield (fh, "LASTNAME");
map[3].field = dbffield (fh, "NICKNAME");
map[4].field = dbffield (fh, "INCOME");
map[5].field = -1;
/* setup starting field locations on the screen */
for (i = 0 ; i < 5 ; i++)
{
map[i].col = col;
col += dict[map[i].field].dbf_len + 1;
}
display ("Firstname Init Lastname \
Nickname Income", 1, 1, alt_low);
}
/*
* * * * * * * * * * * * *
* This function displays the current record from the dBASE file
*/
void record_display (int fh, struct MAP *map, int row)
{
int i;
for (i = 0 ; i < 5 ; i++)
dispdbf (fh, map[i].field, row, map[i].col, reverse);
}
/*
* * * * * * * * * * * * *
* This function accepts a record for the dBASE file
* It returns 1 if the record is completely entered, o/w zero
*/
int record_accept (int fh, struct MAP *map, int row)
{
int i, ret;
for (i = 0; i < 5 && i >= 0 ; )
{
set_crsr (row, map[i].col); /* set cursor */
ret = acptdbf (fh, map[i].field, alt_high);
if (ret < 0) return 0; /* error */
switch (ret)
{
case QUIT: case ESC: return 0;
case 0: case ENTER: case CRS_RT: i++; break;
case CRS_LT: i--; break;
default: shortbeep(ret); break;
}
}
return (i < 0 ? 0 : 1);
}
/*
* * * * * * * * * * * * * * * *
* This program reads opens a dBASE file and its associated index file.
* Then reads sequentially through the file to allow the operator to
* modify the INCOME field.
* This continues until the end of the file or the F10 key is pressed.
*/
void main ()
{
int fh, ndx, ret, x, action = 1;
struct DBF_DEF *dict;
struct MAP map[6];
/* initialize */
clr_scrn ("Test dBASE screen I/O");
set_keys (3, ESC, CRS_RT, CRS_LT);
fh = fileopen ("MARIETTA\\FRIENDS.DBF", dbase3, update);
if (!fh) goodbye (err_wndw (" Cannot find FRIENDS.DBF file ", 0, 0));
dict = FN[fh].fnext; /* dBASE data dictionary */
ndx = ndxopen (fh, "MARIETTA\\FRIENDS.NDX"); /* index file */
if (ndx <= 0) goodbye (10);
setup (fh, dict, map);
/* read and display the first record */
ret = ndxread (ndx, firstrec);
record_display (fh, map, (x = 2));
/* read and update file */
for (;;)
{
flt_wndw (5, 20, "Select action");
action = menu ("Next record&Previous record&Modify record&\
Add a record&Quit (or press ESC)&", 20, action, 1);
rm_wndw(); /* remove menu window */
switch (action)
{
case 1: /* next record */
ret = ndxread (ndx, nextrec);
if (ret <= 0) err_wndw (" End of file reached ", 0, 9);
else record_display (fh, map, ++x);
break;
case 2: /* previous record */
ret = ndxread (ndx, previous);
if (ret <= 0) err_wndw (" End of file reached ", 0, 9);
else record_display (fh, map, ++x);
break;
case 3: /* modify record */
ret = record_accept (fh, map, x);
if (ret) ndxwrite (ndx); /* rewrite modified record */
break;
case 4: /* add new record */
memset (FN[fh].record, 32, FN[fh].rec_len); /* clear record */
*FN[fh].record = IN_USE;
ret = record_accept (fh, map, ++x);
if (ret) ndxappend (ndx); /* write new record */
break;
default: /* end with F10 or Esc */
fileclos (fh);
goodbye (0);
}
}
}