Using DWGPREFIX to get a directory name.

[stanovb]

I've seen a couple of routines that are using "DWGPREFIX " to get the folder name in a network directory but then they have a couple of numbers after the substr. Here is an example:

(Setq dwgnm (substr (getvar "dwgprefix")5 2))
(Setq dwgnm1 (substr (getvar "dwgprefix")22 2))

Does anyone have any idea what this could be for? I've seen this in a couple of routines that have numbers as part of the substr but i dont know what it refers to.

[p_mcknight]

substr allows you to get substrings from anywhere in a string.  The first number is the index of where to start while the second is the string length to return.  Hence, (substr "ABCD" 2 2) would return "BC".  The examples you saw were probably getting a specific part of the path based off of a structured folder naming system.

[mid-awe · Accepted solution]

Yours is a substr question. Take a look at the documentation.

substr

[stanovb]

Thanks to you both. That makes perfect sense.