Question

How do you resolve an NT style device path, e.g. \Device\CdRom0, to its logical drive letter, e.g. G:\ ?

Edit: A Volume Name isn’t the same as a Device Path so unfortunately GetVolumePathNamesForVolumeName() won’t work.

Answer 1

Hopefully the following piece of code will give you enough to solve this – after you’ve initialised it, you just need to iterate through the collection to find your match. You may want to convert everything to upper/lower case before you insert into the collection to help with lookup performance.

typedef basic_string<TCHAR> tstring; typedef map<tstring, tstring> HardDiskCollection;  void Initialise( HardDiskCollection &_hardDiskCollection ) {     TCHAR tszLinkName[MAX_PATH] = { 0 };     TCHAR tszDevName[MAX_PATH] = { 0 };     TCHAR tcDrive = 0;      _tcscpy_s( tszLinkName, MAX_PATH, _T('a:') );     for ( tcDrive = _T('a'); tcDrive < _T('z'); ++tcDrive )     {         tszLinkName[0] = tcDrive;         if ( QueryDosDevice( tszLinkName, tszDevName, MAX_PATH ) )         {             _hardDiskCollection.insert( pair<tstring, tstring>( tszLinkName, tszDevName ) );         }     } }