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中国DOS联盟论坛 » DOS学习入门 & 精彩文章（教学室） » View 1,000　Replies 2

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

hotdog

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What determines the number after if errorlevel?
I can't figure it out.
If it means every line that runs has a number
.........
copy xxcopy.exe %RAMD%:\ > NUL
rem copy extract.exe %RAMD%:\ > NUL
set comspec=%RAMD%:\command.com
LH MSCDEX.EXE /D:MSCD000 /L:%CDROM%

CDA %CDROM% > NUL
IF errorlevel 1 GOTO NEXTCD
then why is it 1 here?

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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CDA %CDROM% > NUL ;use CDA %cdrom% to check whether the cdrom is ready; if it is ready it returns 1,
IF errorlevel 1 GOTO NEXTCD;if it returns 1 then goto nextcd, otherwise execute the next line.

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Floor 3 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 can it have?

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