public static bool Exists(string path)
{
#if DOTNET5_4
string longFilePath = path;
if (Interop.CrossPlatformHelpers.IsWindows)
{
longFilePath = LongPath.ToUncPath(longFilePath);
}
return(File.Exists(longFilePath));
#else
try
{
if (String.IsNullOrEmpty(path))
{
return(false);
}
path = LongPath.ToUncPath(path);
bool success = NativeMethods.PathFileExistsW(path);
if (!success)
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] { 0, NativeMethods.ERROR_DIRECTORY_NOT_FOUND, NativeMethods.ERROR_FILE_NOT_FOUND });
}
var fileAttributes = GetAttributes(path);
return(success && (FileAttributes.Directory != (fileAttributes & FileAttributes.Directory)));
}
catch (ArgumentException) { }
catch (NotSupportedException) { } // Security can throw this on ":"
catch (System.Security.SecurityException) { }
catch (IOException) { }
catch (UnauthorizedAccessException) { }
return(false);
#endif
}
public static FileStream Open(string filePath, FileMode mode, FileAccess access, FileShare share)
{
#if DOTNET5_4
return(new FileStream(filePath, mode, access, share));
#else
filePath = LongPath.ToUncPath(filePath);
SafeFileHandle fileHandle = GetFileHandle(filePath, mode, access, share);
return(new FileStream(fileHandle, access));
#endif
}
/// <summary>
/// Creates all directories and subdirectories in the specified path unless they already exist.
/// </summary>
/// <param name="path">The directory to create.</param>
public static void CreateDirectory(string path)
{
#if DOTNET5_4
Directory.CreateDirectory(path);
#else
var dir = LongPath.GetDirectoryName(path);
if (!string.IsNullOrEmpty(dir) && !LongPathDirectory.Exists(dir))
{
LongPathDirectory.CreateDirectory(dir);
}
path = LongPath.ToUncPath(path);
if (!NativeMethods.CreateDirectoryW(path, IntPtr.Zero))
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_ALREADY_EXISTS
});
}
#endif
}
public static IEnumerable <string> EnumerateFileSystemEntries(string path, string searchPattern, SearchOption searchOption, FilesOrDirectory filter)
{
#if DOTNET5_4
return(Directory.EnumerateFileSystemEntries(path, searchPattern, searchOption));
#else
NativeMethods.WIN32_FIND_DATA findData;
NativeMethods.SafeFindHandle findHandle;
string currentPath = null;
int errorCode = 0;
Queue <string> folders = new Queue <string>();
String searchPath = LongPath.Combine(path, searchPattern);
path = LongPath.GetDirectoryName(searchPath);
searchPattern = LongPath.GetFileName(searchPath);
folders.Enqueue(path);
while (folders.Count > 0)
{
currentPath = folders.Dequeue();
if (searchOption == SearchOption.AllDirectories)
{
findHandle = NativeMethods.FindFirstFileW(LongPath.Combine(LongPath.ToUncPath(currentPath), "*"), out findData);
if (!findHandle.IsInvalid)
{
do
{
if (findData.FileName != "." &&
findData.FileName != "..")
{
if (findData.FileAttributes == FileAttributes.Directory)
{
folders.Enqueue(LongPath.Combine(currentPath, findData.FileName));
}
}
}while (NativeMethods.FindNextFileW(findHandle, out findData));
// Get last Win32 error right after native calls.
// Dispose SafeFindHandle will call native methods, it is possible to set last Win32 error.
errorCode = Marshal.GetLastWin32Error();
if (findHandle != null &&
!findHandle.IsInvalid)
{
findHandle.Dispose();
}
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(errorCode,
new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
else
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
}
findHandle = NativeMethods.FindFirstFileW(LongPath.Combine(LongPath.ToUncPath(currentPath), searchPattern), out findData);
if (!findHandle.IsInvalid)
{
do
{
if (findData.FileName != "." &&
findData.FileName != "..")
{
if ((filter == FilesOrDirectory.All) ||
(filter == FilesOrDirectory.Directory && findData.FileAttributes == FileAttributes.Directory) ||
(filter == FilesOrDirectory.File && findData.FileAttributes != FileAttributes.Directory))
{
yield return(LongPath.Combine(currentPath, findData.FileName));
}
}
}while (NativeMethods.FindNextFileW(findHandle, out findData));
// Get last Win32 error right after native calls.
// Dispose SafeFindHandle will call native methods, it is possible to set last Win32 error.
errorCode = Marshal.GetLastWin32Error();
if (findHandle != null &&
!findHandle.IsInvalid)
{
findHandle.Dispose();
}
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(errorCode,
new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
else
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
}
#endif
}
