[LinLinLin]

So we can get the folder and read the txt file in vpk.

[Silvers]

VPK_API (Reader and Writer) or you could try using OpenDirectory() and OpenFile() with the "use_valve_fs" option set to "true"

[LinLinLin]

i want to use vpk name as a key to store the mission, so it can show the vpk name instead the value of "Name" when showing the map list on menu.

[Forgetest]

Likely impossible to do it in your way, but it's possible to get a list of all VPK names.
Try saving the output of command show_addon_metadata with ServerCommandEx (make sure the buffer is big enough), or just use the attached plugin and the gamedata.

[LinLinLin]

i have made a plugin by myself, you can check it in this
only read vecAddonMetadata in address is suitable since we don't know how big the buffer of command "show_addon_metadata" will return.

the data struct is path[128], mission_name[128] and int( 8 ) type, so the offset is 264 after one of that.

There is still a problem when get all of the vpk, since dword_38EAB0 is not easy to get.
I use addonlist.txt to sum of addon list, but if a map is Multi-packet of vpk, it is not correct.