public static unsafe extern bool WinUsb_WritePipe(
SafeUsbHandle interfaceHandle,
byte pipeID,
[Friendly(FriendlyFlags.In | FriendlyFlags.Array)] byte *buffer,
int bufferLength,
out int lengthTransferred,
[Friendly(FriendlyFlags.In | FriendlyFlags.Optional)] NativeOverlapped *overlapped);
/// <summary>
/// Initializes a new instance of the <see cref="WinUsbOverlapped"/> class.
/// </summary>
/// <param name="handle">
/// A handle to the WinUSB device on which the I/O is being performed.
/// </param>
/// <param name="pipeID">
/// The ID of the pipe on which the I/O is being performed.
/// </param>
/// <param name="buffer">
/// The buffer which is used by the I/O operation. This buffer will be pinned for the duration of
/// the operation.
/// </param>
/// <param name="cancellationToken">
/// A <see cref="CancellationToken"/> which can be used to cancel the overlapped I/O.
/// </param>
public WinUsbOverlapped(SafeUsbHandle handle, byte pipeID, Memory <byte> buffer, CancellationToken cancellationToken)
{
this.handle = handle ?? throw new ArgumentNullException(nameof(handle));
this.pipeID = pipeID;
this.buffer = buffer;
this.cancellationToken = cancellationToken;
}
/// <summary>
/// Asynchronously reads data from the specified pipe.
/// </summary>
/// <param name="interfaceHandle">
/// An opaque handle to the interface that contains the endpoint with which the pipe is associated.
/// </param>
/// <param name="pipeID">
/// <paramref name="pipeID"/> corresponds to the bEndpointAddress field in the endpoint descriptor.
/// </param>
/// <param name="buffer">
/// A caller-allocated buffer that receives the data that is read.
/// </param>
/// <param name="cancellationToken">
/// A <see cref="CancellationToken"/> which can be used to cancel the asynchronous operation.
/// </param>
/// <returns>
/// A <see cref="ValueTask"/> which represents the asynchronous operation, and returns the number of bytes transferred.
/// </returns>
public static unsafe ValueTask <int> WinUsb_ReadPipeAsync(SafeUsbHandle interfaceHandle, byte pipeID, Memory <byte> buffer, CancellationToken cancellationToken)
{
var overlapped = new WinUsbOverlapped(interfaceHandle, pipeID, buffer, cancellationToken);
var nativeOverlapped = overlapped.Pack();
if (WinUsb_ReadPipe(
interfaceHandle,
pipeID,
(byte *)overlapped.BufferHandle.Pointer,
buffer.Length,
out int lengthTransferred,
nativeOverlapped))
{
overlapped.Unpack();
return(new ValueTask <int>(lengthTransferred));
}
public static unsafe extern bool WinUsb_QueryPipe(
SafeUsbHandle interfaceHandle,
byte alternateInterfaceNumber,
byte pipeIndex,
[Friendly(FriendlyFlags.Out)] WINUSB_PIPE_INFORMATION *pipeInformation);
public static extern bool WinUsb_Initialize(Kernel32.SafeObjectHandle deviceHandle, out SafeUsbHandle interfaceHandle);
public static extern bool WinUsb_AbortPipe(SafeUsbHandle handle, byte pipeID);