@subst

[samintz]

Here is a simple function to tell if a drive has been subst'ed. It works akin to @cdrom and @remote.

[C:\] function subst=`%@if[%@index["%@winapi[kernel32.dll,QueryDosDeviceW,"%1",BUFFER,1024]",\??\] != -1,1,0]`

[C:\] echo %@subst[c:]
0

[C:\] echo %@subst[p:]
1

 

[TimButterfield]

Here is a simple function to tell if a drive has been subst'ed. It works akin to @cdrom and @remote.

[C:\] function subst=`%@if[%@index["%@winapi[kernel32.dll,QueryDosDeviceW,"%1",BUFFER,1024]",\??\] != -1,1,0]`

[C:\] echo %@subst[c:]
0

[C:\] echo %@subst[p:]
1

Another, simpler option for this may be to compare the results of @truename with the @subst arg.

 

[Charles Dye]

Be advised that TCC has a built-in function @SUBST (which does something completely different).

 

[samintz]

I forgot about that. Well, in keeping with my Persistent Subst command, I'll rename it to @psubst and add in support for whether a drive is SUBST'ed, Persistently SUBST'ed, or neither.
IsSubst.btm

@echo off
iff %@index["%@winapi[kernel32.dll,QueryDosDeviceW,"%1",BUFFER,1024]",\??\] != -1 then
    iff %@regquery["HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices\%1"] != -1 then
        echos 2
    else
        echos 1
    endiff
else
    echos 0
endiff

and the new function is:

function psubst=`%@execstr[IsSubst.btm %1]`
echo %@psubst[c:] %@psubst[p:] %@psubst[y:]
0 2 1

 

[vefatica]

Scott, do you use persistent SUBSTs? And do they give you any problems? I used them for a while after discovering the technique but backed off trying to solve a problem (XPS writer not working on one machine). That turned out to be unrelated to the SUBSTs (owner of %TEMP was from a previous install of the OS) but I never reinstated them.

 

[samintz]

Yes. I use them all the time. Very handy. And I've never experienced any issues with them.
Here's my original post: https://jpsoft.com/forums/threads/psubst-persistent-subst-command.6495/#post-37443