[英]Communicate with USB device in C# using LibUsbDotNet
0) 在 Windows7 Ultimate 32 位下工作並安裝 linusb-win32-dlevel-filter 1.2.6.0。
1)我嘗試了libusb dotnet的showinfo示例並得到以下結果,[請查看結果(1-結果)]
2) 之后我嘗試讀取(輪詢)libusb 的示例,但在“ec = reader.Read(readBuffer, 1000, out bytesRead);”行出現錯誤錯誤是“win32error:no more byte!” [請看代碼(2-代碼)]
這個錯誤是什么意思,我該如何解決? 實際上我是usb設備通信的新手,如果對使用c#進行usb設備通信有任何想法,請幫助我
1-結果:-
長度:18 描述符類型:設備 BcdUsb:0x0110 類:通信子類:0x00 協議:0x00 MaxPacketSize0:64 供應商 ID:0x11CA 產品 ID:0x0241 BcdDevice:0x0100 制造商字符串索引:1 產品字符串索引:2 序列字符串索引:3 配置計數:1 制造商字符串:VeriFone Inc 產品字符串:Trident USB設備 1.1 序列號:
長度:9 DescriptorType:配置 TotalLength:67 InterfaceCount:2 ConfigID:1 StringIndex:0 Attributes:0xC0 MaxPower:25 ConfigString:
長度:7 描述符類型:端點 EndpointID:0x85 屬性:0x03 MaxPacketSize:16 間隔:0 刷新:0 同步地址:0x00
長度:9 描述符類型:接口接口 ID:1 備用 ID:0 端點計數:2 類:數據子類:0x00 協議:0x00 字符串索引:0 接口字符串:
長度:7 描述符類型:端點 EndpointID:0x81 屬性:0x02 MaxPacketSize:64 間隔:0 刷新:0 同步地址:0x00
長度:7 描述符類型:端點 EndpointID:0x03 屬性:0x02 MaxPacketSize:32 間隔:0 刷新:0 同步地址:0x00
2-代碼:-
公共靜態 UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(4554, 577);
ErrorCode ec = ErrorCode.None;
try
{
// Find and open the usb device.
MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);
// If the device is open and ready
if (MyUsbDevice == null) throw new Exception("Device Not Found.");
IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
if (!ReferenceEquals(wholeUsbDevice, null))
{
// This is a "whole" USB device. Before it can be used,
// the desired configuration and interface must be selected.
// Select config #1
wholeUsbDevice.SetConfiguration(1);
// Claim interface #0.
wholeUsbDevice.ClaimInterface(0);
}
// open read endpoint 1.
UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep01);
byte[] readBuffer = new byte[1024];
while (ec == ErrorCode.None)
{
int bytesRead;
// If the device hasn't sent data in the last 5 seconds,
// a timeout error (ec = IoTimedOut) will occur.
ec = reader.Read(readBuffer, 5000, out bytesRead);
if (bytesRead == 0) throw new Exception(string.Format("{0}:No more bytes!", ec));
Console.WriteLine("{0} bytes read", bytesRead);
// Write that output to the console.
Console.Write(Encoding.Default.GetString(readBuffer, 0, bytesRead));
}
Console.WriteLine("\r\nDone!\r\n");
}
catch (Exception ex)
{
Console.WriteLine();
Console.WriteLine((ec != ErrorCode.None ? ec + ":" : String.Empty) + ex.Message);
}
finally
{
if (MyUsbDevice != null)
{
if (MyUsbDevice.IsOpen)
{
IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
if (!ReferenceEquals(wholeUsbDevice, null))
{
// Release interface #0.
wholeUsbDevice.ReleaseInterface(0);
}
MyUsbDevice.Close();
}
MyUsbDevice = null;
// Free usb resources
UsbDevice.Exit();
}
// Wait for user input..
Console.ReadKey();
}
通過注意您的描述符,您必須將您的接口設置為1 。
wholeUsbDevice.ClaimInterface(1)
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.