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中国DOS联盟论坛 » DOS学习入门 & 精彩文章（教学室） » Question View 812　Replies 7

Original Poster Posted 2003-08-05 00:00　·　中国浙江杭州余杭区电信

hotdog

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@echo off
choice /c:dem defrag,mem,end
if errorlevel 3 goto defrag
if errorlevel 2 goto mem
if errorlevel 1 goto end
Can it be changed to
if errorlevel 1 goto defrag
if errorlevel 2 goto mem
if errorlevel 3 goto end
or if errorlevel 3 goto end
if errorlevel 2 goto mem
if errorlevel 1 goto defrag

Floor 2 Posted 2003-08-05 00:00　·　中国广东广州白云区电信

电吉入侵

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No.

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Floor 3 Posted 2003-08-05 00:00　·　中国浙江杭州余杭区电信

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Floor 4 Posted 2003-08-05 00:00　·　中国广东肇庆电信

sensen

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if errorlevel 1..... means that if the return value is greater than or equal to 1, it will execute the corresponding code.

Floor 5 Posted 2003-08-05 00:00　·　中国浙江杭州余杭区电信

hotdog

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How many return values does it have?

Floor 6 Posted 2003-08-05 00:00　·　中国广东肇庆电信

sensen

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That depends on what command the previous line of code is.

Floor 7 Posted 2003-08-05 00:00　·　中国浙江杭州余杭区电信

hotdog

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Could you give an example?

Floor 8 Posted 2003-08-06 00:00　·　中国广东肇庆电信

sensen

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FINDCD>NUL ;use FINDCD to look up the drive letter of the first CD-ROM
DREADY %CDROM% >NUL ;use DREADY to determine whether %CRDOM% is ready
IF ERRORLEVEL 2 FINDCD 2>NUL ;if it is not ready then use FINDCD to look up the drive letter of the second CD-ROM
IF ERRORLEVEL 0 IF NOT EXIST %CDROM%\QW\QW.EXE FINDCD 2>NUL;if it is ready but there is no qw.exe then use FINDCD to look up the drive letter of the second CD-ROM
DREADY has four values:
0：ready;
1:ready only;
2:not ready;
255:invalid

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