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无法写入USB HID设备

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我正在尝试写入USB HID设备 .

我的代码曾经在32位XP上工作，但是对于不好我'm trying on 64bit Windows 7. I can find the device, get it'的路径，使用 CreateFile win32 API函数打开一个句柄并将其传递给FileStream . 到目前为止一切似乎都很好 . 然后我将数据写入流并且USB设备什么都不做 .

我怎样才能找出为什么它没有做任何事情然后希望它能做些什么呢？

这是我的导入签名：

[DllImport("kernel32.dll", SetLastError = true)]
    public static extern SafeFileHandle CreateFile(
        [MarshalAs(UnmanagedType.LPStr)] string name,
        uint access,
        int shareMode,
        IntPtr security,
        int creationFlags,
        int attributes,
        IntPtr template);

调用功能：

var handle = usb.Win32Wrapper.CreateFile(path, usb.Win32Wrapper.GENERIC_READ | usb.Win32Wrapper.GENERIC_WRITE, 0, IntPtr.Zero, usb.Win32Wrapper.OPEN_EXISTING, usb.Win32Wrapper.FILE_FLAG_OVERLAPPED, IntPtr.Zero);

将FileStream打开到设备：

_main = new FileStream(handle, FileAccess.Write, 1, true);

最后写到文件：

_main.Write(buffer,0,buffer.Length);
c# usb hid

2 回答

  • -1

    如果不了解您设备的具体情况，很难说 .

    您确认可以与设备通信（hidapi，HIDSharp等）吗？有's nothing saying a USB HID device can' t回复NAK直到时间结束，在这种情况下你的发送永远不会完成 .

    我第一次尝试通过HID进行通信时遇到的问题（我已经使用Windows 7一段时间了，所以我不能说XP是否有相同的限制）：

    （1）确保包含报告ID字节 . 即使您的设备不支持，Windows也需要报告ID为0 .

    （2）在Windows上，您的缓冲区需要与最大报告的长度相同 . 因此，例如，如果您的报告是48个字节，则需要写入49个字节（始终以报告ID开头） . 如果我不这样做，我似乎记得写错了 .

    既然你提到了64位Windows ......

    （3）我遇到的一个64位Windows特定问题是（从.NET 2.0和4.0开始）64位P / Invoke不会将OVERLAPPED结构（或NativeOverlapped）视为blittable . 因此，如果您使用'ref OVERLAPPED'，它将进行复制，P / Invoke和复制 . 重叠操作假设内存不会出现细微的内存损坏等问题 . 您可以使用fixed（）或stackalloc解决此问题 - 它与T *相同，即使结构已在堆栈上分配 .

    希望这三个中的至少一个能解决你的问题 . :)

    詹姆士

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  • 2

    -------------------------------PRİNTBARCODE---------------

    private int PrintBarcode(string barcode, string printFormat, int printCount)
    {
        string text = "B400,50,1,1,2,1,150,B,";
        if (printFormat != null)
        {
            text = printFormat;
        }
        string barcod = string.Concat(new object[]
        {
            text,
            Convert.ToChar(34),
            barcode,
            Convert.ToChar(34),
            "\n"
        });

        string printerName= ConfigurationManager.AppSettings["PrinterName"];

        int x = 100;
        int y = 0;
        using (EtiquetaTestCommand1 etiquetaTestCommand = new EtiquetaTestCommand1(new Size(500, 750), 19, new Point(x, y), printCount, barcod))
        {
            string commandString = ((ICommand)etiquetaTestCommand).GetCommandString();


            //var sb1 = new StringBuilder();
           // sb1.AppendLine();
           // sb1.AppendLine("N");
           // sb1.AppendLine("Q750,19");
           // sb1.AppendLine("q500");
           // sb1.AppendLine("R100,0");
           // sb1.AppendLine(barcod);
           // sb1.AppendLine("P1");

            RawPrinterHelper.SendStringToPrinter(printerName, commandString.ToString());


        }

    ---------------------------------- EtiquetaTestCommand1 --------------- -----------

    internal sealed class EtiquetaTestCommand1 : Label, IDisposable
{
    private Bitmap _bmp;

    internal EtiquetaTestCommand1(Size size, int gapLength, Point referencePoint, int numberCopies, string barcod) : base(size, gapLength, referencePoint, numberCopies, barcod)
    {
        int x = 5;
        int y = 5;
        ((IComplexCommand)this).AddCommand(BarCodeCommand.Code128ModeABarCodeCommand(x, y, barcod));
    }

    ~EtiquetaTestCommand1()
    {
        this.Dispose(false);
    }

    private void Dispose(bool disposing)
    {
        if (disposing)
        {
        }
    }

    void IDisposable.Dispose()
    {
        this.Dispose(true);
    }
}

    ----------------------的PrinterName ---------------

    <add key="PrinterName" value="ZDesigner LP 2844"/>

    ----------------- SendStringToPrinter ----------------------

    public class RawPrinterHelper
    {
        // Structure and API declarions:
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public class DOCINFOA
        {
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDocName;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pOutputFile;
            [MarshalAs(UnmanagedType.LPStr)]
            public string pDataType;
        }
        [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

        [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool ClosePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

        [DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool EndDocPrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool StartPagePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool EndPagePrinter(IntPtr hPrinter);

        [DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

        // SendBytesToPrinter()
        // When the function is given a printer name and an unmanaged array
        // of bytes, the function sends those bytes to the print queue.
        // Returns true on success, false on failure.
        public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
        {
            Int32 dwError = 0, dwWritten = 0;
            IntPtr hPrinter = new IntPtr(0);
            DOCINFOA di = new DOCINFOA();
            bool bSuccess = false; // Assume failure unless you specifically succeed.

            di.pDocName = "My C#.NET RAW Document";
            di.pDataType = "RAW";

            // Open the printer.
            if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
            {
                // Start a document.
                if (StartDocPrinter(hPrinter, 1, di))
                {
                    // Start a page.
                    if (StartPagePrinter(hPrinter))
                    {
                        // Write your bytes.
                        bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
                        EndPagePrinter(hPrinter);
                    }
                    EndDocPrinter(hPrinter);
                }
                ClosePrinter(hPrinter);
            }
            // If you did not succeed, GetLastError may give more information
            // about why not.
            if (bSuccess == false)
            {
                dwError = Marshal.GetLastWin32Error();
            }
            return bSuccess;
        }

        public static bool SendFileToPrinter(string szPrinterName, string szFileName)
        {
            // Open the file.
            FileStream fs = new FileStream(szFileName, FileMode.Open);
            // Create a BinaryReader on the file.
            BinaryReader br = new BinaryReader(fs);
            // Dim an array of bytes big enough to hold the file's contents.
            Byte[] bytes = new Byte[fs.Length];
            bool bSuccess = false;
            // Your unmanaged pointer.
            IntPtr pUnmanagedBytes = new IntPtr(0);
            int nLength;

            nLength = Convert.ToInt32(fs.Length);
            // Read the contents of the file into the array.
            bytes = br.ReadBytes(nLength);
            // Allocate some unmanaged memory for those bytes.
            pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength);
            // Copy the managed byte array into the unmanaged array.
            Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength);
            // Send the unmanaged bytes to the printer.
            bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength);
            // Free the unmanaged memory that you allocated earlier.
            Marshal.FreeCoTaskMem(pUnmanagedBytes);
            return bSuccess;
        }
        public static bool SendStringToPrinter(string szPrinterName, string szString)
        {
            IntPtr pBytes;
            Int32 dwCount;
            // How many characters are in the string?
            dwCount = (szString.Length + 1) * Marshal.SystemMaxDBCSCharSize;
            // Assume that the printer is expecting ANSI text, and then convert
            // the string to ANSI text.
            pBytes = Marshal.StringToCoTaskMemAnsi(szString);
            // Send the converted ANSI string to the printer.
            SendBytesToPrinter(szPrinterName, pBytes, dwCount);
            Marshal.FreeCoTaskMem(pBytes);
            return true;
        }
    }
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