public static extern int WNetGetUniversalName(string lpLocalPath,
int dwInfoLevel, ref UNIVERSAL_NAME_INFO lpBuffer, ref int lpBufferSize);
public static extern int WNetGetUniversalName(string lpLocalPath,
int dwInfoLevel, ref UNIVERSAL_NAME_INFO lpBuffer, ref int lpBufferSize);
/// <summary>
/// Returns the UNC path for a mapped drive or local share.
/// </summary>
/// <param name="fileName">The path to map</param>
/// <returns>The UNC path (if available)</returns>
public static string PathToUnc(string fileName)
{
if (null == fileName || 0 == fileName.Length) return string.Empty;
fileName = Path.GetFullPath(fileName);
if (!IsValidFilePath(fileName)) return fileName;
int nRet = 0;
UNIVERSAL_NAME_INFO rni = new UNIVERSAL_NAME_INFO();
int bufferSize = Marshal.SizeOf(rni);
nRet = UncUtilities.WNetGetUniversalName(
fileName, UncUtilities.UNIVERSAL_NAME_INFO_LEVEL,
ref rni, ref bufferSize);
if (UncUtilities.ERROR_MORE_DATA == nRet)
{
IntPtr pBuffer = Marshal.AllocHGlobal(bufferSize); ;
try
{
nRet = UncUtilities.WNetGetUniversalName(
fileName, UncUtilities.UNIVERSAL_NAME_INFO_LEVEL,
pBuffer, ref bufferSize);
if (UncUtilities.NO_ERROR == nRet)
{
rni = (UNIVERSAL_NAME_INFO)Marshal.PtrToStructure(pBuffer,
typeof(UNIVERSAL_NAME_INFO));
}
}
finally
{
Marshal.FreeHGlobal(pBuffer);
}
}
switch (nRet)
{
case UncUtilities.NO_ERROR:
return rni.lpUniversalName;
case UncUtilities.ERROR_NOT_CONNECTED:
//Local file-name
ShareCollection shi = LocalShares;
if (null != shi)
{
Share share = shi[fileName];
if (null != share)
{
string path = share.Path;
if (null != path && 0 != path.Length)
{
int index = path.Length;
if (Path.DirectorySeparatorChar != path[path.Length - 1])
index++;
if (index < fileName.Length)
fileName = fileName.Substring(index);
else
fileName = string.Empty;
fileName = Path.Combine(share.ToString(), fileName);
}
}
}
return fileName;
default:
Console.WriteLine("Unknown return value: {0}", nRet);
return string.Empty;
}
}
