Argox PA-20 Programming Guide Bedienungsanleitung PDF herunterladen (Seite 63)

PT-20 Programming Guide

argument

description

_DBMS* F_Search

The file’s searching structure that has been

initialized.

char* multi_field

String data wanted to match.

The string form is “field string 0, field

number 0; field string 1, field number 1;...”.

Each field string and field number use

separate symbol ”,”, behind the field number

use separate symbol ”;”, last field number

don’t use any separate symbol.

int recordno

Begin to search from which data.

int get_field_no

After contrasting success, acquiring the data

of appointed field in this record.

char* F_Buffer

After contrast success, it will write record

which included this field into buffer.

int flag

FORWARD => Search from forward to

backward

BACKWARD => Search from backward to

forward

As success of searching, the file index will

stay in successful record front. When search

defeat, the file index will not be moved.

Returns：

When “F _ Buffer = NULL”, pass back – 1: Search defeat; Pass other

value back: That is the size of space for buffer.

When “F _ Buffer ≠ NULL”, pass back – 1: Search defeat; Pass other

value back: That is the record position which confirm to contrast data.

SeekRecord

Purpose：

Move the searching index to the appointed record.

Syntax：

long SeekRecord(_DBMS* F_Search,int recordno);

Example call：

SeekRecord(&fsearch,10);//move file index to eleventh record。

Includes：

#include “DBMS.h”

Description：

Use this function can move the search index to appointed record. The

number of first record is 0. The number of second record is 1.

Returns：

-1: The index move is defeated.

Other value: the present address of searching index

GetRecordNum

Purpose：

Use this function can read the total amount of records storing in the file at

present. .

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 129 130

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