private void ProcessConcreteCompletedOperation(IAsyncOperationWithProgress <IBuffer, uint> completedOperation, out long bytesCompleted)
{
IBuffer resultBuffer = completedOperation.GetResults();
Debug.Assert(resultBuffer != null);
WinRtIOHelper.EnsureResultsInUserBuffer(_userBuffer, resultBuffer);
bytesCompleted = _userBuffer.Length;
}
private static async Task <Stream> OpenStreamForWriteAsyncCore(this IStorageFolder rootDirectory, String relativePath,
CreationCollisionOption creationCollisionOption)
{
Contract.Requires(rootDirectory != null);
Contract.Requires(!String.IsNullOrWhiteSpace(relativePath));
Contract.Requires(creationCollisionOption == CreationCollisionOption.FailIfExists ||
creationCollisionOption == CreationCollisionOption.GenerateUniqueName ||
creationCollisionOption == CreationCollisionOption.OpenIfExists ||
creationCollisionOption == CreationCollisionOption.ReplaceExisting,
"The specified creationCollisionOption has a value that is not a value we considered when devising the"
+ " policy about Append-On-OpenIfExists used in this method. Apparently a new enum value was added to the"
+ " CreationCollisionOption type and we need to make sure that the policy still makes sense.");
Contract.Ensures(Contract.Result <Task <Stream> >() != null);
Contract.EndContractBlock();
try
{
// Open file and set up default options for opening it:
IStorageFile windowsRuntimeFile = await rootDirectory.CreateFileAsync(relativePath, creationCollisionOption)
.AsTask().ConfigureAwait(continueOnCapturedContext: false);
Int64 offset = 0;
// If the specified creationCollisionOption was OpenIfExists, then we will try to APPEND, otherwise we will OVERWRITE:
if (creationCollisionOption == CreationCollisionOption.OpenIfExists)
{
BasicProperties fileProperties = await windowsRuntimeFile.GetBasicPropertiesAsync()
.AsTask().ConfigureAwait(continueOnCapturedContext: false);
UInt64 fileSize = fileProperties.Size;
Debug.Assert(fileSize <= Int64.MaxValue, ".NET streams assume that file sizes are not larger than Int64.MaxValue,"
+ " so we are not supporting the situation where this is not the case.");
offset = checked ((Int64)fileSize);
}
// Now open a file with the correct options:
Stream managedStream = await OpenStreamForWriteAsyncCore(windowsRuntimeFile, offset).ConfigureAwait(continueOnCapturedContext: false);
return(managedStream);
}
catch (Exception ex)
{
// From this API, managed dev expect IO exceptions for "something wrong":
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ex).Throw();
return(null);
}
}
// Moved it to the end while using Dev10 VS because it does not understand async and everything that follows looses intellisense.
// Should move this code into the Reading regios once using Dev11 VS becomes the norm.
private async Task <Int32> ReadAsyncInternal(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
{
Debug.Assert(buffer != null);
Debug.Assert(offset >= 0);
Debug.Assert(count >= 0);
Debug.Assert(buffer.Length - offset >= count);
Debug.Assert(_canRead);
IInputStream wrtStr = EnsureNotDisposed <IInputStream>();
#if DEBUG
AssertValidStream(wrtStr);
#endif // DEBUG
try
{
IBuffer userBuffer = buffer.AsBuffer(offset, count);
IAsyncOperationWithProgress <IBuffer, UInt32> asyncReadOperation = wrtStr.ReadAsync(userBuffer,
unchecked ((UInt32)count),
InputStreamOptions.Partial);
IBuffer resultBuffer = await asyncReadOperation.AsTask(cancellationToken).ConfigureAwait(continueOnCapturedContext: false);
// If cancellationToken was cancelled until now, then we are currently propagating the corresponding cancellation exception.
// (It will be correctly rethrown by the catch block below and overall we will return a cancelled task.)
// But if the underlying operation managed to complete before it was cancelled, we want
// the entire task to complete as well. This is ok as the continuation is very lightweight:
if (resultBuffer == null)
{
return(0);
}
WinRtIOHelper.EnsureResultsInUserBuffer(userBuffer, resultBuffer);
Debug.Assert(resultBuffer.Length <= unchecked ((UInt32)Int32.MaxValue));
return((Int32)resultBuffer.Length);
}
catch (Exception ex)
{
// If the interop layer gave us an Exception, we assume that it hit a general/unknown case and wrap it into
// an IOException as this is what Stream users expect.
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ex).Throw();
return(0);
}
}
private static async Task <Stream> OpenStreamForReadAsyncCore(this IStorageFile windowsRuntimeFile)
{
Debug.Assert(windowsRuntimeFile != null);
try
{
IRandomAccessStream windowsRuntimeStream = await windowsRuntimeFile.OpenAsync(FileAccessMode.Read)
.AsTask().ConfigureAwait(continueOnCapturedContext: false);
Stream managedStream = windowsRuntimeStream.AsStreamForRead();
return(managedStream);
}
catch (Exception ex)
{
// From this API, managed dev expect IO exceptions for "something wrong":
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ex).Throw();
return(null);
}
}
private static async Task <Stream> OpenStreamForReadAsyncCore(this IStorageFolder rootDirectory, string relativePath)
{
Debug.Assert(rootDirectory != null);
Debug.Assert(!string.IsNullOrWhiteSpace(relativePath));
try
{
IStorageFile windowsRuntimeFile = await rootDirectory.GetFileAsync(relativePath)
.AsTask().ConfigureAwait(continueOnCapturedContext: false);
Stream managedStream = await windowsRuntimeFile.OpenStreamForReadAsync()
.ConfigureAwait(continueOnCapturedContext: false);
return(managedStream);
}
catch (Exception ex)
{
// From this API, managed dev expect IO exceptions for "something wrong":
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ex).Throw();
return(null);
}
}
private static async Task <Stream> OpenStreamForWriteAsyncCore(this IStorageFile windowsRuntimeFile, Int64 offset)
{
Contract.Requires(windowsRuntimeFile != null);
Contract.Requires(offset >= 0);
Contract.Ensures(Contract.Result <Task <Stream> >() != null);
Contract.EndContractBlock();
try
{
IRandomAccessStream windowsRuntimeStream = await windowsRuntimeFile.OpenAsync(FileAccessMode.ReadWrite)
.AsTask().ConfigureAwait(continueOnCapturedContext: false);
Stream managedStream = windowsRuntimeStream.AsStreamForWrite();
managedStream.Position = offset;
return(managedStream);
}
catch (Exception ex)
{
// From this API, managed dev expect IO exceptions for "something wrong":
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ex).Throw();
return(null);
}
}
private void ThrowWithIOExceptionDispatchInfo(Exception e)
{
WinRtIOHelper.NativeExceptionToIOExceptionInfo(ExceptionSupport.AttachRestrictedErrorInfo(_completedOperation.ErrorCode)).Throw();
}
