A New Method to Judge the CD-ROM Drive - China DOS Union Forum

According to the idea of 26933062, I made one

@echo off&setlocal EnableDelayedExpansion
for /f "usebackq skip=1 tokens=2 delims==" %%a in (`findcd /s`) do (
  set "str=%%a"
  set "str=!str:~0,1!"
  dir !str!: >nul 2>nul
chcp 936>nul
  if !ERRORLEVEL! equ 0 (echo.&echo The CD is drive !str! and there is a CD inside) else (
     echo.&echo The CD is drive !str! and there is no CD
))
echo.&pause&exit

Explanation: findcd.exe is a third-party program, only 3.11K

If this program findcd is added with the /s parameter, it will list multiple CDs, and the result is as in the following example:

CDROM=2
CDROM1=H:
CDROM2=I:

Under old DOS, these variables will be assigned, saving a lot of trouble, but under XP, it can't! And it will change the codepage, so I added a line CHCP 936.

The actual running result is as follows:

The CD is drive 2 and there is a CD inside

The CD is drive H and there is a CD inside

The CD is drive I and there is a CD inside

Press any key to continue...

Why is there an extra line, it seems that skip=1 is useless, I don't understand.

Why can't I insert an attachment? I want to attach the program of findcd. Download here

[ Last edited by quya on 2008-5-28 at 11:29 PM ]

Floor16　quya	Posted 2008-05-28 22:13
高级用户　Posts 172　Credits 558　From 江苏
There are still some questions to ask. It is said that the fsutil command can only be restricted to be used by administrators, and only the XP Pro version can be used. The dir [drive] >nul 2>nul is too useful. But do we have to go back to the old way of for %%i in (C: D: E: F: G: H: I: J: K: L: M: N: O: P: Q: R: S: T: U: V: W: X: Y: Z:) do if exist %%i\WIN51 set CDROM=%%i? There is a defect in this old way, that is, it is necessary to judge a specific file. Is there a better way?

Floor17　quya	Posted 2008-05-28 23:08
高级用户　Posts 172　Credits 558　From 江苏
According to the idea of 26933062, I made one @echo off&setlocal EnableDelayedExpansion for /f "usebackq skip=1 tokens=2 delims==" %%a in (`findcd /s`) do ( set "str=%%a" set "str=!str:~0,1!" dir !str!: >nul 2>nul chcp 936>nul if !ERRORLEVEL! equ 0 (echo.&echo The CD is drive !str! and there is a CD inside) else ( echo.&echo The CD is drive !str! and there is no CD )) echo.&pause&exit Explanation: findcd.exe is a third-party program, only 3.11K If this program findcd is added with the /s parameter, it will list multiple CDs, and the result is as in the following example: CDROM=2 CDROM1=H: CDROM2=I: Under old DOS, these variables will be assigned, saving a lot of trouble, but under XP, it can't! And it will change the codepage, so I added a line CHCP 936. The actual running result is as follows: The CD is drive 2 and there is a CD inside The CD is drive H and there is a CD inside The CD is drive I and there is a CD inside Press any key to continue... Why is there an extra line, it seems that skip=1 is useless, I don't understand. Why can't I insert an attachment? I want to attach the program of findcd. Download here [ Last edited by quya on 2008-5-28 at 11:29 PM ]

Floor18　WANKOILZ	Posted 2008-05-29 19:34
初级用户　Posts 89　Credits 198　From 重庆
%var1%^\|more %var2% %%a: This trick in floor 11 looks very neat! [ Last edited by WANKOILZ on 2008-5-29 at 07:38 PM ]