64 lines
2.6 KiB
HTML
64 lines
2.6 KiB
HTML
<HTML>
|
|
<HEAD><TITLE>QuickBASIC 3.0 - Long Entry</TITLE></HEAD>
|
|
<BODY>
|
|
|
|
<A HREF="ng10e75.html">[<<Previous Entry]</A>
|
|
<A HREF="ng320.html">[^^Up^^]</A>
|
|
<A HREF="ng11727.html">[Next Entry>>]</A>
|
|
<A HREF="menu.html" >[Menu]</A>
|
|
<A HREF="info.html">[About The Guide]</A>
|
|
<HR>
|
|
<PRE>
|
|
<B>FIELD Allocate Space for Random File Variables</B>
|
|
|
|
<B>FIELD</B> [#]<U>filenum</U>, <U>fieldwidth</U> <B>AS</B> <U>stringvar</U> [,<U>fieldwidth</U> AS <U>stringvar</U>]...
|
|
|
|
Allocates storage for any number of string variables, each of
|
|
specified character width, to be used in conjunction with a specified
|
|
random file buffer.
|
|
|
|
<U>filenum</U> The number under which the file was OPENed.
|
|
|
|
<U>fieldwidth</U> The number of character positions to be allotted to
|
|
<U>stringvar</U>.
|
|
|
|
<U>stringvar</U> A string variable to be used for random access.
|
|
|
|
----------------------------------------------------------------------
|
|
|
|
<B>Notes:</B> Once the random file has been FIELDed, data may be
|
|
extracted from the random file buffer after a GET
|
|
statement or placed into the buffer in preparation for a
|
|
PUT statement.
|
|
|
|
A string variable defined by means of the FIELD statement
|
|
points to a specified position in the random file buffer.
|
|
It should not thereafter be used as an INPUT variable or
|
|
on the left side of an assignment statement. Doing either
|
|
of these things will point the variable name into the
|
|
string space and remove it from the file buffer.
|
|
|
|
Multiple field definitions for a given random file buffer
|
|
are permitted. Each new FIELD statement starts again at
|
|
the first character position of the buffer, and all FIELD
|
|
statements for a given random file are in effect
|
|
simultaneously. All FIELD definitions are removed when a
|
|
file is CLOSEd.
|
|
|
|
QuickBASIC resets all FIELDed variables to null when the
|
|
associated file is CLOSEd or RESET. (In interpreted BASIC,
|
|
such variables retain their last assigned values.)
|
|
</PRE>
|
|
<HR>
|
|
<B>See Also:</B>
|
|
<A HREF="ng127c8.html">GET (File I/O)</A>
|
|
<A HREF="ng1b48a.html">LSET</A>
|
|
<A HREF="ng298af.html">PUT (File I/O)</A>
|
|
<A HREF="ng2bce4.html">RSET</A>
|
|
<HR>
|
|
This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
|
|
Written by <A HREF="http://www.acemake.com/hagbard">Dave Pearson</A>
|
|
<HR>
|
|
</BODY>
|
|
</HTML>
|