public void SendRequest(ref IOUSBDeviceRequest request)
{
ThrowIfDisposed();
var result = Interface.DeviceRequest(InterfaceRef, ref request);
IOObject.ThrowIfError(result);
}
char[] GetStringDescriptor(byte index, int language)
{
// based on http://oroboro.com/usb-serial-number-osx/
const int maxUsbStringLength = 255;
var buffer = Marshal.AllocHGlobal(maxUsbStringLength);
try {
var request = new IOUSBDeviceRequest()
{
Direction = EndpointDirection.In,
DeviceRequestType = DeviceRequestType.Standard,
Recipient = DeviceRequestRecipient.Device,
RequestType = RequestType.GetDescriptor,
Value = (ushort)((byte)DescriptorType.String << 8 | index),
Index = (ushort)language,
DataLength = maxUsbStringLength,
Data = buffer
};
var result = Interface.DeviceRequest(InterfaceRef, ref request);
ThrowIfError(result);
var header = (IOUSBDescriptorHeader)Marshal.PtrToStructure(buffer, typeof(IOUSBDescriptorHeader));
var dataLength = (header.Length - 1) / 2;
var data = new char[dataLength];
Marshal.Copy(buffer + 2, data, 0, dataLength);
return(data);
} finally {
Marshal.FreeHGlobal(buffer);
}
}
public Task <int> SendRequestAsync(IOUSBDeviceRequest request)
{
ThrowIfDisposed();
var completionSource = new TaskCompletionSource <int> ();
GCHandle callbackHandle = new GCHandle();
IOAsyncCallback1 callback = (refCon, callbackResult, arg0) => {
callbackHandle.Free();
if (callbackResult == IOReturn.Success)
{
completionSource.TrySetResult((int)arg0);
}
else
{
completionSource.TrySetException(callbackResult.ToNSErrorException());
}
};
callbackHandle = GCHandle.Alloc(callback, GCHandleType.Pinned);
var result = Interface.DeviceRequestAsync(InterfaceRef, request, callback, IntPtr.Zero);
IOObject.ThrowIfError(result);
return(completionSource.Task);
}