#### Stream-Oriented HANDLEs

Asio contains classes to allow asynchronous read and write operations to be performed on Windows `HANDLE`s, such as named pipes.

For example, to perform asynchronous operations on a named pipe, the following object may be created:

    HANDLE handle = ::CreateFile(...);
    windows::stream_handle pipe(my_io_context, handle);

These are then used as synchronous or asynchronous read and write streams. This means the objects can be used with any of the read(), async_read(), write(), async_write(), read_until() or async_read_until() free functions.

The kernel object referred to by the `HANDLE` must support use with I/O completion ports (which means that named pipes are supported, but anonymous pipes and console streams are not).

###### See Also

windows::stream_handle.

###### Notes

Windows stream `HANDLE`s are only available at compile time when targeting Windows and only when the I/O completion port backend is used (which is the default). A program may test for the macro `ASIO_HAS_WINDOWS_STREAM_HANDLE` to determine whether they are supported.