GWBASIC User's Manual

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GW-BASIC <strong>User's</strong> Guide UNLOCK Statement Purpose: To release locks that have been applied to an opened file. This is used in a multi-device environment, often referred to as a network or network environment. Syntax: UNLOCK [#]n [,[record number] [TO record number]] Comments: n is the number that was assigned the file as it was originally numbered in the program. record number is the number of the individual record that is to be unlocked. Or, if a range of records are to be unlocked, record number designates the beginning and ending record of the specified range. The range of legal record numbers is 1 to 2 32-1. The limit on record size is 32767 bytes. The record range specified must be from lower to (the same or) higher record numbers. If a starting record number is not specified, the record number 1 is assumed. If an ending record number is not specified, then only the specified record is unlocked. The following are legal UNLOCK statements: UNLOCK #n unlocks the entire file n UNLOCK #n, X unlocks record X only UNLOCK #n, TO Y unlocks records 1 through Y UNLOCK #n, X TO Y unlocks records X through Y The locked file or record range should be unlocked before the file is closed. Failure to execute the UNLOCK statement can jeopardize future access to that file in a network environment. In the case of files opened in random mode, if a range of record numbers is specified, this range must match exactly the record number range given in the LOCK statement. The "Permission denied" message will appear if a syntactically correct UNLOCK request cannot be granted. The UNLOCK statement must match exactly the paired LOCK statement. It is expected that the time in which files or regions within files are locked will be short, and thus the suggested usage of the LOCK statement is within shortterm paired LOCK/UNLOCK statements. file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/UNLOCK.html (1 of 2)28/03/2004 21.29.40
GW-BASIC <strong>User's</strong> Guide Examples: The following demonstrates how the LOCK/UNLOCK statements should be used: LOCK #1, 1 TO 4 LOCK #1, 5 TO 8 UNLOCK #1, 1 TO 4 UNLOCK #1, 5 TO 8 The following example is illegal: LOCK #1, 1 TO 4 LOCK #1, 5 TO 8 UNLOCK #1, 1 TO 8 file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/UNLOCK.html (2 of 2)28/03/2004 21.29.40
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GWBASIC User's Manual User's Guide
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GWBASIC User's Manual FILES Command
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GWBASIC User's Manual PSET Statemen
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GW-BASIC User's Guide Chapter 1 Wel
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GW-BASIC User's Guide The Glossary
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GW-BASIC User's Guide 2.2.2 Indirec
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GW-BASIC User's Guide Sample GW-BAS
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GW-BASIC User's Guide system assume
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GW-BASIC User's Guide Note Reuse of
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GW-BASIC User's Guide moves the cha
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GW-BASIC User's Guide CTRL-G Causes
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GW-BASIC User's Guide BASIC User's
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GW-BASIC User's Guide Note ↵ (arr
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GW-BASIC User's Guide Appendix H Ke
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GW-BASIC User's Guide KEY(n) n is a
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GW-BASIC User's Guide STRIG Trappin
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GW-BASIC User's Guide KEY(n) Statem
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GW-BASIC User's Guide LOC(x) Return
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GW-BASIC User's Guide 15 KEY OFF:CL
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GW-BASIC User's Guide and check the
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GW-BASIC User's Guide Chapter 3 Rev
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GW-BASIC User's Guide until the RUN
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GW-BASIC User's Guide To save a fil
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GW-BASIC User's Guide Hexadecimal H
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GW-BASIC User's Guide The GW-BASIC
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GW-BASIC User's Guide The arithmeti
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GW-BASIC User's Guide Modulus arith
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GW-BASIC User's Guide EQV X Y X EQV
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GW-BASIC User's Guide RUN FILENAME
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GW-BASIC User's Guide OPTION BASE S
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GW-BASIC User's Guide LET Statement
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GW-BASIC User's Guide . . 400 R=1:
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GW-BASIC User's Guide ● Sequentia
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GW-BASIC User's Guide The program i
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GW-BASIC User's Guide PUT #1, CODE%
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GW-BASIC User's Guide number. Lines
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GW-BASIC User's Guide Appendix A Er
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GW-BASIC User's Guide 18 Undefined
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GW-BASIC User's Guide 59-60Unprinta
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GW-BASIC User's Guide 75 Path/File
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GW-BASIC User's Guide Appendix C AS
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GW-BASIC User's Guide Appendix D As
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GW-BASIC User's Guide moved the cur
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GW-BASIC User's Guide that the code
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GW-BASIC User's Guide DEF USR State
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GW-BASIC User's Guide USR Function
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GW-BASIC User's Guide E.3 Multiple
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GW-BASIC User's Guide 8 8 18 24 90
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GW-BASIC User's Guide _ Underscore.
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GW-BASIC User's Guide Data represen
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GW-BASIC User's Guide binary system
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GW-BASIC User's Guide computers or
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GW-BASIC User's Guide double-precis
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GW-BASIC User's Guide graphics A ha
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GW-BASIC User's Guide An extra-bit
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GW-BASIC User's Guide single-densit
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GW-BASIC User's Guide ABS Function
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GW-BASIC User's Guide CHR$ Function
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GW-BASIC User's Guide AUTO Command
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GW-BASIC User's Guide BLOAD Command
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GW-BASIC User's Guide BSAVE Command
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GW-BASIC User's Guide Note ● Valu
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GW-BASIC User's Guide CDBL Function
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GW-BASIC User's Guide INT Function
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GW-BASIC User's Guide CHAIN Stateme
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GW-BASIC User's Guide MERGE Command
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GW-BASIC User's Guide CIRCLE Statem
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GW-BASIC User's Guide COLOR Stateme
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GW-BASIC User's Guide For more info
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GW-BASIC User's Guide EGA with Enha
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GW-BASIC User's Guide SCREEN 10 ●
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GW-BASIC User's Guide For various s
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GW-BASIC User's Guide PALETTE, PALE
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GW-BASIC User's Guide Enhanced d EG
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GW-BASIC User's Guide N Move, but r
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GW-BASIC User's Guide LINE Statemen
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GW-BASIC User's Guide LINE (0,0)-(1
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GW-BASIC User's Guide tile_length i
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GW-BASIC User's Guide PRESET and PS
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GW-BASIC User's Guide CLEAR Command
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GW-BASIC User's Guide CLOSE Stateme
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GW-BASIC User's Guide COM(n) Statem
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GW-BASIC User's Guide CONT Command
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GW-BASIC User's Guide CSRLIN Variab
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GW-BASIC User's Guide CVI, CVS, CVD
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GW-BASIC User's Guide DATA Statemen
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GW-BASIC User's Guide RESTORE State
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GW-BASIC User's Guide the value of
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GW-BASIC User's Guide DEFINT/SNG/DB
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GW-BASIC User's Guide DEF and SEG m
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GW-BASIC User's Guide POKE Statemen
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GW-BASIC User's Guide EDIT Command
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GW-BASIC User's Guide ENVIRON State
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GW-BASIC User's Guide ENVIRON$ Func
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GW-BASIC User's Guide SHELL Stateme
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GW-BASIC User's Guide EOF Function
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GW-BASIC User's Guide ERDEV and ERD
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GW-BASIC User's Guide ERROR Stateme
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GW-BASIC User's Guide EXP Function
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GW-BASIC User's Guide FIELD Stateme
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GW-BASIC User's Guide GET Statement
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GW-BASIC User's Guide FOR ... NEXT
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GW-BASIC User's Guide FRE Function
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GW-BASIC User's Guide The number of
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GW-BASIC User's Guide GOTO Statemen
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GW-BASIC User's Guide OCT$ Function
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GW-BASIC User's Guide Testing Equal
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Page 221 and 222: GW-BASIC User's Guide INPUT Stateme
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Page 237 and 238: GW-BASIC User's Guide IOCTL Stateme
Page 239 and 240: GW-BASIC User's Guide KILL Command
Page 241 and 242: GW-BASIC User's Guide MID$ Function
Page 243 and 244: GW-BASIC User's Guide LEN FUNCTION
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Page 301 and 302: GW-BASIC User's Guide SGN Function
Page 303 and 304: GW-BASIC User's Guide SOUND Stateme
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Page 307 and 308: GW-BASIC User's Guide SQR Function
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GW-BASIC User's Guide WRITE Stateme
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