【发布时间】：2010-11-24 13:55:59
【问题描述】：
如何在C#中访问USB端口，发送数据流和接收其他数据？
【问题讨论】：
【发布时间】：2010-11-24 13:55:59
【问题描述】：
有一个 .net 库：SharpUSBLib
http://www.icsharpcode.net/OpenSource/SharpUSBLib/default.aspx
【讨论】：
有许多库可以完成这项工作。这是来自 Usb.Net (https://github.com/MelbourneDeveloper/Device.Net) 的三个平台的示例代码
Windows (WinUSB)
public override Task InitializeAsync()
{
Dispose();
int errorCode;
if (string.IsNullOrEmpty(DeviceId))
{
throw new WindowsException($"{nameof(DeviceDefinition)} must be specified before {nameof(InitializeAsync)} can be called.");
}
_DeviceHandle = APICalls.CreateFile(DeviceId, (APICalls.GenericWrite | APICalls.GenericRead), APICalls.FileShareRead | APICalls.FileShareWrite, IntPtr.Zero, APICalls.OpenExisting, APICalls.FileAttributeNormal | APICalls.FileFlagOverlapped, IntPtr.Zero);
if (_DeviceHandle.IsInvalid)
{
//TODO: is error code useful here?
errorCode = Marshal.GetLastWin32Error();
if (errorCode > 0) throw new Exception($"Device handle no good. Error code: {errorCode}");
}
var isSuccess = WinUsbApiCalls.WinUsb_Initialize(_DeviceHandle, out var defaultInterfaceHandle);
HandleError(isSuccess, "Couldn't initialize device");
var bufferLength = (uint)Marshal.SizeOf(typeof(USB_DEVICE_DESCRIPTOR));
isSuccess = WinUsbApiCalls.WinUsb_GetDescriptor(defaultInterfaceHandle, WinUsbApiCalls.DEFAULT_DESCRIPTOR_TYPE, 0, 0, out _UsbDeviceDescriptor, bufferLength, out var lengthTransferred);
HandleError(isSuccess, "Couldn't get device descriptor");
byte i = 0;
//Get the first (default) interface
var defaultInterface = GetInterface(defaultInterfaceHandle);
_UsbInterfaces.Add(defaultInterface);
while (true)
{
isSuccess = WinUsbApiCalls.WinUsb_GetAssociatedInterface(defaultInterfaceHandle, i, out var interfacePointer);
if (!isSuccess)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode == APICalls.ERROR_NO_MORE_ITEMS) break;
throw new Exception($"Could not enumerate interfaces for device {DeviceId}. Error code: { errorCode}");
}
var associatedInterface = GetInterface(interfacePointer);
_UsbInterfaces.Add(associatedInterface);
i++;
}
IsInitialized = true;
RaiseConnected();
return Task.CompletedTask;
}
public override async Task<byte[]> ReadAsync()
{
return await Task.Run(() =>
{
var bytes = new byte[ReadBufferSize];
//TODO: Allow for different interfaces and pipes...
var isSuccess = WinUsbApiCalls.WinUsb_ReadPipe(_DefaultUsbInterface.Handle, _DefaultUsbInterface.ReadPipe.WINUSB_PIPE_INFORMATION.PipeId, bytes, ReadBufferSize, out var bytesRead, IntPtr.Zero);
HandleError(isSuccess, "Couldn't read data");
Tracer?.Trace(false, bytes);
return bytes;
});
}
public override async Task WriteAsync(byte[] data)
{
await Task.Run(() =>
{
if (data.Length > WriteBufferSize)
{
throw new Exception($"Data is longer than {WriteBufferSize} bytes which is the device's max buffer size.");
}
//TODO: Allow for different interfaces and pipes...
var isSuccess = WinUsbApiCalls.WinUsb_WritePipe(_DefaultUsbInterface.Handle, _DefaultUsbInterface.WritePipe.WINUSB_PIPE_INFORMATION.PipeId, data, (uint)data.Length, out var bytesWritten, IntPtr.Zero);
HandleError(isSuccess, "Couldn't write data");
Tracer?.Trace(true, data);
});
}
UWP
public override async Task InitializeAsync()
{
await GetDevice(DeviceId);
if (_ConnectedDevice != null)
{
var usbInterface = _ConnectedDevice.Configuration.UsbInterfaces.FirstOrDefault();
if (usbInterface == null)
{
_ConnectedDevice.Dispose();
throw new Exception("There was no Usb Interface found for the device.");
}
var interruptPipe = usbInterface.InterruptInPipes.FirstOrDefault();
if (interruptPipe == null)
{
throw new Exception("There was no interrupt pipe found on the interface");
}
interruptPipe.DataReceived += InterruptPipe_DataReceived;
RaiseConnected();
}
else
{
throw new Exception($"Could not connect to device with Device Id {DeviceId}. Check that the package manifest has been configured to allow this device.");
}
}
public override async Task WriteAsync(byte[] bytes)
{
var bufferToSend = bytes.AsBuffer();
var usbInterface = _ConnectedDevice.Configuration.UsbInterfaces.FirstOrDefault();
var outPipe = usbInterface.InterruptOutPipes.FirstOrDefault();
await outPipe.OutputStream.WriteAsync(bufferToSend);
Tracer?.Trace(false, bytes);
}
public override async Task<byte[]> ReadAsync()
{
if (_IsReading)
{
throw new Exception("Reentry");
}
lock (_Chunks)
{
if (_Chunks.Count > 0)
{
var retVal = _Chunks[0];
Tracer?.Trace(false, retVal);
_Chunks.RemoveAt(0);
return retVal;
}
}
_IsReading = true;
_TaskCompletionSource = new TaskCompletionSource<byte[]>();
return await _TaskCompletionSource.Task;
}
安卓
public async Task InitializeAsync()
{
//TODO: Use a semaphore lock here
if (_IsInitializing)
{
return;
}
_IsInitializing = true;
try
{
//TODO:
//Dispose();
var isPermissionGranted = await RequestPermissionAsync();
if (!isPermissionGranted.HasValue)
{
throw new Exception("User did not respond to permission request");
}
if (!isPermissionGranted.Value)
{
throw new Exception("The user did not give the permission to access the device");
}
var usbInterface = _UsbDevice.GetInterface(0);
//TODO: This selection stuff needs to be moved up higher. The constructor should take these arguments
for (var i = 0; i < usbInterface.EndpointCount; i++)
{
var ep = usbInterface.GetEndpoint(i);
if (_ReadEndpoint == null && ep.Type == UsbAddressing.XferInterrupt && ep.Address == (UsbAddressing)129)
{
_ReadEndpoint = ep;
continue;
}
if (_WriteEndpoint == null && ep.Type == UsbAddressing.XferInterrupt && (ep.Address == (UsbAddressing)1 || ep.Address == (UsbAddressing)2))
{
_WriteEndpoint = ep;
}
}
//TODO: This is a bit of a guess. It only kicks in if the previous code fails. This needs to be reworked for different devices
if (_ReadEndpoint == null)
{
_ReadEndpoint = usbInterface.GetEndpoint(0);
}
if (_WriteEndpoint == null)
{
_WriteEndpoint = usbInterface.GetEndpoint(1);
}
if (_ReadEndpoint.MaxPacketSize != ReadBufferLength)
{
throw new Exception("Wrong packet size for read endpoint");
}
if (_WriteEndpoint.MaxPacketSize != ReadBufferLength)
{
throw new Exception("Wrong packet size for write endpoint");
}
_UsbDeviceConnection = UsbManager.OpenDevice(_UsbDevice);
if (_UsbDeviceConnection == null)
{
throw new Exception("could not open connection");
}
if (!_UsbDeviceConnection.ClaimInterface(usbInterface, true))
{
throw new Exception("could not claim interface");
}
Logger.Log("Hid device initialized. About to tell everyone.", null, LogSection);
IsInitialized = true;
RaiseConnected();
return;
}
catch (Exception ex)
{
Logger.Log("Error initializing Hid Device", ex, LogSection);
}
_IsInitializing = false;
}
public override async Task<byte[]> ReadAsync()
{
try
{
var byteBuffer = ByteBuffer.Allocate(ReadBufferLength);
var request = new UsbRequest();
request.Initialize(_UsbDeviceConnection, _ReadEndpoint);
request.Queue(byteBuffer, ReadBufferLength);
await _UsbDeviceConnection.RequestWaitAsync();
var buffers = new byte[ReadBufferLength];
byteBuffer.Rewind();
for (var i = 0; i < ReadBufferLength; i++)
{
buffers[i] = (byte)byteBuffer.Get();
}
//Marshal.Copy(byteBuffer.GetDirectBufferAddress(), buffers, 0, ReadBufferLength);
Tracer?.Trace(false, buffers);
return buffers;
}
catch (Exception ex)
{
Logger.Log(Helpers.ReadErrorMessage, ex, LogSection);
throw new IOException(Helpers.ReadErrorMessage, ex);
}
}
public override async Task WriteAsync(byte[] data)
{
try
{
var request = new UsbRequest();
request.Initialize(_UsbDeviceConnection, _WriteEndpoint);
var byteBuffer = ByteBuffer.Wrap(data);
Tracer?.Trace(true, data);
request.Queue(byteBuffer, data.Length);
await _UsbDeviceConnection.RequestWaitAsync();
}
catch (Exception ex)
{
Logger.Log(Helpers.WriteErrorMessage, ex, LogSection);
throw new IOException(Helpers.WriteErrorMessage, ex);
}
}
【讨论】：
这里有一些信息，还有一个图书馆：USB & C#
【讨论】：
这个网站绝对可以帮助你...
http://libusbdotnet.sourceforge.net
它包含一个类库和一些 2010 年发布的示例代码
【讨论】：
如果你的USB设备类是HID你也可以试试thisC#驱动。
【讨论】：