private async Task MoveDirectoryAsync(string sourceFullPath, string destFullPath)
{
StorageFolder sourceFolder = await StorageFolder.GetFolderFromPathAsync(sourceFullPath).TranslateWinRTTask(sourceFullPath, isDirectory: true);
// WinRT doesn't support move, only rename
// If parents are the same, just rename.
string sourceParent, sourceFolderName, destParent, destFolderName;
PathHelpers.SplitDirectoryFile(sourceFullPath, out sourceParent, out sourceFolderName);
PathHelpers.SplitDirectoryFile(destFullPath, out destParent, out destFolderName);
// same parent folder
if (String.Equals(sourceParent, destParent, StringComparison.OrdinalIgnoreCase))
{
// not the same subfolder
if (!String.Equals(sourceFolderName, destFolderName, StringComparison.OrdinalIgnoreCase))
{
await sourceFolder.RenameAsync(destFolderName).TranslateWinRTTask(destFullPath, isDirectory: true);
}
// else : nothing to do
}
else
{
// Otherwise, create the destination and move each item recursively.
// We could do a copy, which would be safer in case of a failure
// We do a move because it has the perf characteristics that match the win32 move
StorageFolder destFolder = await CreateDirectoryAsync(destFullPath, failIfExists : true).ConfigureAwait(false);
await MoveDirectoryAsync(sourceFolder, destFolder).ConfigureAwait(false);
}
}
private async Task <StorageFolder> CreateDirectoryAsync(string fullPath, bool failIfExists)
{
if (fullPath.Length >= Interop.Kernel32.MAX_DIRECTORY_PATH)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
Stack <string> stackDir = new Stack <string>();
StorageFolder workingFolder = null;
string workingPath = fullPath;
// walk up the path until we can get a directory
while (workingFolder == null)
{
try
{
workingFolder = await StorageFolder.GetFolderFromPathAsync(workingPath).TranslateWinRTTask(workingPath, isDirectory: true);
}
catch (IOException) { }
catch (UnauthorizedAccessException) { }
if (workingFolder == null)
{
// we couldn't get the directory, we'll need to create it
string folderName = null;
PathHelpers.SplitDirectoryFile(workingPath, out workingPath, out folderName);
if (String.IsNullOrEmpty(folderName))
{
// we reached the root and it did not exist. we can't create roots.
throw Win32Marshal.GetExceptionForWin32Error(Interop.Errors.ERROR_PATH_NOT_FOUND, workingPath);
}
stackDir.Push(folderName);
Debug.Assert(!String.IsNullOrEmpty(workingPath));
}
}
Debug.Assert(workingFolder != null);
if (failIfExists && (stackDir.Count == 0))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.Errors.ERROR_ALREADY_EXISTS, fullPath);
}
// we have work to do. if stackDir is empty it means we were passed a path to an existing directory.
while (stackDir.Count > 0)
{
// use CreationCollisionOption.OpenIfExists to address a race conditions when creating directories
workingFolder = await workingFolder.CreateFolderAsync(stackDir.Pop(), CreationCollisionOption.OpenIfExists).TranslateWinRTTask(fullPath, isDirectory: true);
}
return(workingFolder);
}
private async Task CopyFileAsync(string sourceFullPath, string destFullPath, bool overwrite)
{
StorageFile file = await StorageFile.GetFileFromPathAsync(sourceFullPath).TranslateWinRTTask(sourceFullPath);
string destDirectory, destFileName;
PathHelpers.SplitDirectoryFile(destFullPath, out destDirectory, out destFileName);
StorageFolder destFolder = await StorageFolder.GetFolderFromPathAsync(destDirectory).TranslateWinRTTask(destDirectory, isDirectory: true);
await file.CopyAsync(destFolder, destFileName, overwrite?NameCollisionOption.ReplaceExisting : NameCollisionOption.FailIfExists).TranslateWinRTTask(sourceFullPath);
}
private static async Task <IStorageItem> GetStorageItemAsync(string fullPath)
{
string directoryPath, itemName;
PathHelpers.SplitDirectoryFile(fullPath, out directoryPath, out itemName);
StorageFolder parent = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath, isDirectory: true);
if (String.IsNullOrEmpty(itemName))
{
return(parent);
}
return(await parent.GetItemAsync(itemName).TranslateWinRTTask(fullPath));
}
private async Task <bool> DirectoryExistsAsync(string fullPath)
{
string directoryPath = null, fileName = null;
PathHelpers.SplitDirectoryFile(fullPath, out directoryPath, out fileName);
// Rather than call await StorageFolder.GetFolderFromPathAsync(fullPath); and catch FileNotFoundException
// we try to avoid the exception by calling TryGetItemAsync.
// We can still hit an exception if the parent directory doesn't exist but it does provide better performance
// for the existing parent/non-existing directory case and avoids a first chance exception which is a developer
// pain point.
StorageFolder parent = null;
try
{
parent = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath, isDirectory: true);
}
catch (IOException) { }
catch (UnauthorizedAccessException) { }
if (String.IsNullOrEmpty(fileName))
{
// we were given a root
return(parent != null);
}
if (parent != null)
{
StorageFolder folder = await parent.TryGetItemAsync(fileName).TranslateWinRTTask(fullPath, isDirectory: true) as StorageFolder;
return(folder != null);
}
else
{
// it's possible we don't have access to the parent but do have access to this folder
try
{
StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(fullPath).TranslateWinRTTask(fullPath, isDirectory: true);
return(folder != null);
}
catch (IOException) { }
catch (UnauthorizedAccessException) { }
}
return(false);
}
private async Task <bool> FileExistsAsync(string fullPath)
{
string directoryPath = null, fileName = null;
PathHelpers.SplitDirectoryFile(fullPath, out directoryPath, out fileName);
if (String.IsNullOrEmpty(fileName))
{
// No filename was provided
return(false);
}
// Rather than call await StorageFile.GetFileFromPathAsync(fullPath); and catch FileNotFoundException
// we try to avoid the exception by calling TryGetItemAsync.
// We can still hit an exception if the directory doesn't exist but it does provide better performance
// for the existing folder/non-existing file case and avoids a first chance exception which is a developer
// pain point.
StorageFolder parent = null;
try
{
parent = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath);
}
catch (IOException) { }
catch (UnauthorizedAccessException) { }
StorageFile file = null;
if (parent != null)
{
// The expectation is that this API will never throw, thus it is missing TranslateWinRTTask
file = await parent.TryGetItemAsync(fileName).TranslateWinRTTask(fullPath) as StorageFile;
}
else
{
// it's possible we don't have access to the parent but do have access to this file
try
{
file = await StorageFile.GetFileFromPathAsync(fullPath).TranslateWinRTTask(fullPath);
}
catch (IOException) { }
catch (UnauthorizedAccessException) { }
}
return((file != null) ? file.IsAvailable : false);
}
private async Task MoveFileAsync(string sourceFullPath, string destFullPath)
{
StorageFile file = await StorageFile.GetFileFromPathAsync(sourceFullPath).TranslateWinRTTask(sourceFullPath);
string destDirectory, destFileName;
PathHelpers.SplitDirectoryFile(destFullPath, out destDirectory, out destFileName);
// Win32 MoveFileEx will return success if source and destination are the same.
// Comparison is safe here as the caller has normalized both paths.
if (!sourceFullPath.Equals(destFullPath, StringComparison.OrdinalIgnoreCase))
{
StorageFolder destFolder = await StorageFolder.GetFolderFromPathAsync(destDirectory).TranslateWinRTTask(destDirectory, isDirectory: true);
await file.MoveAsync(destFolder, destFileName, NameCollisionOption.FailIfExists).TranslateWinRTTask(sourceFullPath);
}
}
// Similar to WinRTFileSystem.TryGetStorageItemAsync but we only
// want to capture exceptions that are not related to file not
// found. This matches the behavior of the Win32 implementation.
private async Task RefreshAsync()
{
string directoryPath, itemName;
_item = null;
_initializationException = null;
try
{
PathHelpers.SplitDirectoryFile(_fullPath, out directoryPath, out itemName);
StorageFolder parent = null;
try
{
parent = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath, isDirectory: true);
}
catch (DirectoryNotFoundException)
{
// Ignore DirectoryNotFound, in this case we just return null;
}
if (String.IsNullOrEmpty(itemName) || null == parent)
{
_item = parent;
}
else
{
_item = await parent.TryGetItemAsync(itemName).TranslateWinRTTask(_fullPath);
}
}
catch (Exception e)
{
_initializationException = ExceptionDispatchInfo.Capture(e);
}
}
private async Task <FileStreamBase> OpenAsync(string fullPath, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, FileStream parent)
{
// When trying to open the root directory, we need to throw an Access Denied
if (PathInternal.GetRootLength(fullPath) == fullPath.Length)
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.Errors.ERROR_ACCESS_DENIED, fullPath);
}
// Win32 CreateFile returns ERROR_PATH_NOT_FOUND when given a path that ends with '\'
if (PathHelpers.EndsInDirectorySeparator(fullPath))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.Errors.ERROR_PATH_NOT_FOUND, fullPath);
}
StorageFile file = null;
// FileMode
if (mode == FileMode.Open || mode == FileMode.Truncate)
{
file = await StorageFile.GetFileFromPathAsync(fullPath).TranslateWinRTTask(fullPath);
}
else
{
CreationCollisionOption collisionOptions;
switch (mode)
{
case FileMode.Create:
collisionOptions = CreationCollisionOption.ReplaceExisting;
break;
case FileMode.CreateNew:
collisionOptions = CreationCollisionOption.FailIfExists;
break;
case FileMode.Append:
case FileMode.OpenOrCreate:
default:
collisionOptions = CreationCollisionOption.OpenIfExists;
break;
}
string directoryPath, fileName;
PathHelpers.SplitDirectoryFile(fullPath, out directoryPath, out fileName);
StorageFolder directory = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath, isDirectory: true);
file = await directory.CreateFileAsync(fileName, collisionOptions).TranslateWinRTTask(fullPath);
}
// FileAccess: WinRT doesn't support FileAccessMode.Write so we upgrade to ReadWrite
FileAccessMode accessMode = ((access & FileAccess.Write) != 0) ? FileAccessMode.ReadWrite : FileAccessMode.Read;
// FileShare: cannot translate StorageFile uses a different sharing model (oplocks) that is controlled via FileAccessMode
// FileOptions: ignore most values of FileOptions as they are hints and are not supported by WinRT.
// FileOptions.Encrypted is not a hint, and not supported by WinRT, but there is precedent for ignoring this (FAT).
// FileOptions.DeleteOnClose should result in an UnauthorizedAccessException when
// opening a file that can only be read, but we cannot safely reproduce that behavior
// in WinRT without actually deleting the file.
// Instead the failure will occur in the finalizer for WinRTFileStream and be ignored.
// open our stream
Stream stream = (await file.OpenAsync(accessMode).TranslateWinRTTask(fullPath)).AsStream(bufferSize);
if (mode == FileMode.Append)
{
// seek to end.
stream.Seek(0, SeekOrigin.End);
}
else if (mode == FileMode.Truncate)
{
// truncate stream to 0
stream.SetLength(0);
}
return(new WinRTFileStream(stream, file, access, options, parent));
}
