Re: From UNC pathname to driveletter

Hi RAN,

I've never tried it in reverse and it would mean you'd have to have a mapped
drive for the network share of course, but this code does the opposite of
what you want (turns a local mapped drive into a share) so perhaps you could
look through this to see where the info is stored in the registry. I don't
know of any direct calls in the API to get this information:

Tom

// Returns the sharename of the local drive/path
// call: localpath = c:\ etc
// returns original path if no share name is found
//
CString GetLocalShareName(const TCHAR *localpath)
{
 // first let's see if they are trying to trick us with a UNC
 if (localpath[1]!=_T(':') || _tcslen(localpath)<3)
  return localpath;

 // lets strip off any path or filename and save for later
 CString csRest, csLocalPath = localpath, csResourceName, csLanPath,
csResourcePath, csCurrentString, csRetPath;
 TCHAR pathData[500];
 DWORD pathType;
 DWORD pathDataSize;
 bool bMatch = false;

 HKEY mainKey;
 OSVERSIONINFO verinfo;
 verinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 GetVersionEx(&verinfo);
 BOOL isNT = verinfo.dwPlatformId==VER_PLATFORM_WIN32_NT;
 long result = RegOpenKeyEx(
  HKEY_LOCAL_MACHINE,
  isNT?
   _T("SYSTEM\\CurrentControlSet\\Services\\LanmanServer\\Shares"):
   _T("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Network\\LanMan"),
  0,
  KEY_READ,
  &mainKey
 );

 if (result == ERROR_SUCCESS) {
  TCHAR lanName[100];
  unsigned long sizeName = _countof(lanName);
  FILETIME time;
  if (isNT) {
   CString NTPathVar = _T("Path=");
   TCHAR data[500];
   DWORD datasize = sizeof data;
   DWORD type;
   // Walk through all the share variables
   for (int i=0 ; !bMatch &&
     RegEnumValue(mainKey, i, lanName, &sizeName, NULL, &type, (unsigned
char*)data, &datasize) == ERROR_SUCCESS ;
     sizeName=_countof(lanName), datasize=sizeof data, ++i) {
    // See if the path string is in there
    for (int j=0 ; data[j] ; j+= (int) _tcslen(&data[j])+1) {
     csCurrentString = CString(&data[j]);
     if (csCurrentString.Left(NTPathVar.GetLength()) == NTPathVar) {
      csCurrentString = csCurrentString.Mid(NTPathVar.GetLength());
      // put a \ on the end to avoid false matches to shorter paths
      if (csCurrentString.Right(1) != _T('\\'))
       csCurrentString += _T('\\');
      csLanPath = csLocalPath.Left(csCurrentString.GetLength());//+1);
      // Add \ on the end of this one so they will compare
      if (csLanPath.Right(1) != _T('\\'))
       csLanPath += _T('\\');
      if (csCurrentString.CompareNoCase(csLanPath) == 0) {
       csResourceName = lanName;
       csResourcePath = csLanPath;
       // we're done, let's go
       bMatch = true;
       break;
      }
     }
    }
   }
  }
  else {
   // walk through all the share folders and check for the path variable
   for (int i=0 ;
     RegEnumKeyEx(mainKey, i, lanName, &sizeName, NULL, NULL, NULL, &time)
== ERROR_SUCCESS ;
     sizeName=_countof(lanName), ++i) {
    HKEY lankey;
    // open up a temp key
    result = RegOpenKeyEx(mainKey, NULL, 0, KEY_READ, &lankey);
    // now open up the key that might be a drive
    result = RegOpenKeyEx(lankey, lanName, sizeName, KEY_READ, &lankey);
    // look for Path variable
    pathDataSize = sizeof pathData;
    LONG ret = RegQueryValueEx(lankey, _T("Path"), NULL, &pathType,
(unsigned char *)pathData, &pathDataSize);
    csCurrentString = pathData;
    // put a \ on the end to avoid false matches to shorter paths
    if (csCurrentString.Right(1) != _T('\\'))
     csCurrentString += _T('\\');
    csLanPath = csLocalPath.Left(csCurrentString.GetLength());
    RegCloseKey(lankey);
    if (ret==ERROR_SUCCESS && pathType==REG_SZ &&
csLanPath.CompareNoCase(csCurrentString) == 0) {
     csResourceName = lanName;
     csResourcePath = csLanPath;
     // we found it, let's go
     bMatch = true;
     break;
    }
   }
  }
  RegCloseKey(mainKey);
 }
 if (bMatch) {
  csRest = csLocalPath.Mid(csResourcePath.GetLength());
  csRetPath = BACK_SLASH + csResourceName;
  if(!csRest.IsEmpty()) {
   RemoveSlash(csRest);
   if(csRest.Left(1) == BACK_SLASH)
    csRetPath += csRest;
   else
    csRetPath += BACK_SLASH + csRest;
  }
 }
 else
  csRetPath = localpath; // it wasn't found, so put back the original
 // make sure we leave the trailing \ on if there was one at the start
 if (csLocalPath.Right(1)==_T('\\') && csRetPath.Right(1)!=_T('\\'))
  csRetPath += _T('\\');
 return csRetPath;
}

"RAN" <nijenhuis@wish.nl> wrote in message
news:c39b88bd-85a2-4a46-91a9-a5c56e580012@p25g2000hsf.googlegroups.com...