public static bool PathFileExists(string path)
{
// PathFileExists()
// 2013-01-13: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
return(!Utils.IsNullOrWhiteSpace(path) && NativeMethods.PathFileExists(Path.GetFullPathCore(null, path, GetFullPathOptions.AsLongPath | GetFullPathOptions.FullCheck | GetFullPathOptions.ContinueOnNonExist)));
}
public static bool PathFileExists(string path)
{
// PathFileExists()
// In the ANSI version of this function, the name is limited to 248 characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
return(!Utils.IsNullOrWhiteSpace(path) && NativeMethods.PathFileExists(Path.GetFullPathCore(null, path, GetFullPathOptions.AsLongPath | GetFullPathOptions.FullCheck | GetFullPathOptions.ContinueOnNonExist)));
}
public static string GetVolumeGuid(string volumeMountPoint)
{
if (Utils.IsNullOrWhiteSpace(volumeMountPoint))
{
throw new ArgumentNullException("volumeMountPoint");
}
// The string must end with a trailing backslash ('\').
volumeMountPoint = Path.GetFullPathCore(null, volumeMountPoint, GetFullPathOptions.AsLongPath | GetFullPathOptions.AddTrailingDirectorySeparator | GetFullPathOptions.FullCheck);
var volumeGuid = new StringBuilder(100);
var uniqueName = new StringBuilder(100);
try
{
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
{
// GetVolumeNameForVolumeMountPoint()
// 2013-07-18: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
return(NativeMethods.GetVolumeNameForVolumeMountPoint(volumeMountPoint, volumeGuid, (uint)volumeGuid.Capacity)
// The string must end with a trailing backslash.
? NativeMethods.GetVolumeNameForVolumeMountPoint(Path.AddTrailingDirectorySeparator(volumeGuid.ToString(), false), uniqueName, (uint)uniqueName.Capacity)
? uniqueName.ToString()
: null
: null);
}
}
finally
{
var lastError = (uint)Marshal.GetLastWin32Error();
switch (lastError)
{
case Win32Errors.ERROR_INVALID_NAME:
NativeError.ThrowException(lastError, volumeMountPoint);
break;
case Win32Errors.ERROR_MORE_DATA:
// (1) When GetVolumeNameForVolumeMountPoint() succeeds, lastError is set to Win32Errors.ERROR_MORE_DATA.
break;
default:
// (2) When volumeMountPoint is a network drive mapping or UNC path, lastError is set to Win32Errors.ERROR_INVALID_PARAMETER.
// Throw IOException.
NativeError.ThrowException(lastError, volumeMountPoint);
break;
}
}
}
public static void SetVolumeMountPoint(string volumeMountPoint, string volumeGuid)
{
if (Utils.IsNullOrWhiteSpace(volumeMountPoint))
{
throw new ArgumentNullException("volumeMountPoint");
}
if (Utils.IsNullOrWhiteSpace(volumeGuid))
{
throw new ArgumentNullException("volumeGuid");
}
if (!volumeGuid.StartsWith(Path.VolumePrefix + "{", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(Resources.Not_A_Valid_Guid, "volumeGuid");
}
volumeMountPoint = Path.GetFullPathCore(null, volumeMountPoint, GetFullPathOptions.AsLongPath | GetFullPathOptions.AddTrailingDirectorySeparator | GetFullPathOptions.FullCheck);
// This string must be of the form "\\?\Volume{GUID}\"
volumeGuid = Path.AddTrailingDirectorySeparator(volumeGuid, false);
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
{
// SetVolumeMountPoint()
// 2014-01-29: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
// The string must end with a trailing backslash.
var success = NativeMethods.SetVolumeMountPoint(volumeMountPoint, volumeGuid);
var lastError = Marshal.GetLastWin32Error();
if (!success)
{
// If the lpszVolumeMountPoint parameter contains a path to a mounted folder,
// GetLastError returns ERROR_DIR_NOT_EMPTY, even if the directory is empty.
if (lastError != Win32Errors.ERROR_DIR_NOT_EMPTY)
{
NativeError.ThrowException(lastError, volumeGuid);
}
}
}
}
public static string GetVolumePathName(string path)
{
if (Utils.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException("path");
}
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
{
var volumeRootPath = new StringBuilder(NativeMethods.MaxPathUnicode / 32);
var pathLp = Path.GetFullPathCore(null, path, GetFullPathOptions.AsLongPath | GetFullPathOptions.FullCheck);
// GetVolumePathName()
// 2013-07-18: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
var success = NativeMethods.GetVolumePathName(pathLp, volumeRootPath, (uint)volumeRootPath.Capacity);
var lastError = Marshal.GetLastWin32Error();
if (success)
{
return(Path.GetRegularPathCore(volumeRootPath.ToString(), GetFullPathOptions.None, false));
}
switch ((uint)lastError)
{
// Don't throw exception on these errors.
case Win32Errors.ERROR_NO_MORE_FILES:
case Win32Errors.ERROR_INVALID_PARAMETER:
case Win32Errors.ERROR_INVALID_NAME:
break;
default:
NativeError.ThrowException(lastError, path);
break;
}
// Return original path.
return(path);
}
}
