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Windows Dev Center

RandomAccessStream.CopyAsync(IInputStream, IOutputStream, UInt64) | copyAsync(IInputStream, IOutputStream, UInt64) method

Copies the specified number of bytes from a source stream to a destination stream.

Syntax


Windows.Storage.Streams.RandomAccessStream.copyAsync(source, destination, bytesToCopy).done( /* Your success and error handlers */ );

public static IAsyncOperationWithProgress<UInt64, UInt64> CopyAsync(
  IInputStream source, 
  IOutputStream destination, 
  ulong bytesToCopy
)

Public Shared Function CopyAsync(
  source As IInputStream,  
  destination As IOutputStream,  
  bytesToCopy As ULong 
) As IAsyncOperationWithProgress(Of UInt64, UInt64)

public:
static IAsyncOperationWithProgress<UInt64, UInt64>^ CopyAsync(
  IInputStream^ source, 
  IOutputStream^ destination, 
  unsigned long long bytesToCopy
)

Parameters

source

Type: IInputStream

The stream to copy data from.

destination

Type: IOutputStream

The stream to copy data to.

bytesToCopy

Type: Number [JavaScript] | System.UInt64 [.NET] | uint64 [C++]

The number of bytes to copy.

Return value

Type: IAsyncOperationWithProgress<UInt64, UInt64>

The asynchronous operation.

Requirements (Windows 10 device family)

Device family

Universal

API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0

Namespace

Windows.Storage.Streams
Windows::Storage::Streams [C++]

Metadata

Windows.Foundation.UniversalApiContract.winmd

Requirements (Windows 8.x and Windows Phone 8.x)

Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8

Namespace

Windows.Storage.Streams
Windows::Storage::Streams [C++]

Metadata

Windows.winmd

See also

RandomAccessStream
CopyAsync(IInputStream, IOutputStream)