文件流C＃重復讀取數據

Question

正在使用帶有文件句柄的文件流與USB HID設備通信，設備將在收到報告后重新發送報告（字節[64]的數組）。 接收方法發生在另一個線程中，該線程在讀取報告時觸發事件，

每次嘗試僅發送一次“報告”，第一次嘗試是好的，收到1個報告，但是當我再次發送時，它會讀取兩次！ （是否在文件流中兩次可用？？）在下一次嘗試時，事件將再次觸發兩次！ 之后，將其添加3次，供接下來的3次嘗試

attempt 1  1 report received
attempt 2  2 reports received
attempt 3  2 reports received
attempt 3  3 reports received
attempt 4  3 reports received
attempt 5  3 reports received
attempt 6  4 reports received
attempt 7  4 reports received

發送了更多報告，原因是收到了4個報告，對此有任何邏輯描述嗎？

碼：

private void WriteData(object Data)
    {
        byte[] data = Data as byte[];
        int bytesSent = 0;
        while (bytesSent < data.Length)
        {
            byte [] OutputReportBuffer = new byte[64];
            for (int i = 0; i < OutputReportBuffer.Length; i++)
                if (bytesSent < data.Length)
                {
                    OutputReportBuffer[i] = data[bytesSent];
                    bytesSent++;
                }
                else OutputReportBuffer[i] = 0;
            try
            {
                fileStream.Write(OutputReportBuffer, 0, OutputReportBuffer.Length);
                fileStream.Flush();
            }
            catch///deducted code
        }
    }

在這里接收到它（讀取數據時觸發事件的單獨線程）

private void ReadData()
    {
        while (true)
        {
            try
            {
                if (fileStream.Read(ReceivedDataBuffer, 0, ReceivedDataBuffer.Length) > 0)
                {
                    _Context.Send(o =>
                    {
                        if (DataReceived != null)
                            DataReceived(this, new DataReceivedEventArgs(ReceivedDataBuffer));
                    }, null);
                }
            }
            catch //deducted code
        }
}

Answer 1

您沒有使用Read的返回值來查找實際獲得的字節數。