Resolve Windows device path to drive letter

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 ) );        }    }}

Maybe you could use GetVolumeNameForMountPoint and iterate through all mount points A:\ through Z:\, breaking when you find a match?

http://msdn.microsoft.com/en-us/library/aa364994(VS.85).aspx

(I haven't tried this)

Following function does the job using C only

BOOL GetWin32FileName(const TCHAR* pszNativeFileName, TCHAR *pszWin32FileName){    BOOL bFound = FALSE;    // Translate path with device name to drive letters.    TCHAR szTemp[MAX_PATH];    szTemp[0] = '\0';    if (GetLogicalDriveStrings(MAX_PATH - 1, szTemp))    {        TCHAR szName[MAX_PATH];        TCHAR szDrive[3] = TEXT(" :");        TCHAR* p = szTemp;        do        {            // Copy the drive letter to the template string            *szDrive = *p;            // Look up each device name            if (QueryDosDevice(szDrive, szName, MAX_PATH))            {                size_t uNameLen = _tcslen(szName);                if (uNameLen < MAX_PATH)                {                    bFound = _tcsnicmp(pszNativeFileName, szName, uNameLen) == 0                        && *(pszNativeFileName + uNameLen) == _T('\\');                    if (bFound)                    {                        // Replace device path with DOS path                        StringCchPrintf(pszWin32FileName,                            MAX_PATH,                            TEXT("%s%s"),                            szDrive,                            pszNativeFileName + uNameLen);                    }                }            }            // Go to the next NULL character.            while (*p++);        } while (!bFound && *p);    }    return(bFound);}