Question

我使用TCP / IP将VideoJet Printer连接到我的PC，创建C＃windows dekstop应用程序来读写TCP Socket。当我使用hercules软件在Hex字符串下面进行选择时[当HEX Checkbox勾选时]它正在响应但是当我从我的C＃代码发送相同的十六进制字符串时它没有响应请在我的代码中建议我在哪里做错了

try
        {
            client = new TcpClient("192.168.2.1", Convert.ToInt32("3001"));

            // Translate the passed message into ASCII and store it as a Byte array.
            Byte[] data = HexString2Bytes(richTextBox3.Text);
            stream = client.GetStream();

            // Send the message to the connected TcpServer. 
            stream.Write(data, 0, data.Length);
            Console.WriteLine("Sent: {0}",richTextBox3.Text);

            // Receive the TcpServer.response.
            data = new Byte[65000];
            var readStream = new MemoryStream();
            int readBytes = stream.Read(data, 0, data.Length);
            while (readBytes > 0)
            {
                readStream.Write(data, 0, readBytes);
                readBytes = stream.Read(data, 0, data.Length);
            }
            var responseData = Encoding.ASCII.GetString(readStream.ToArray());
        }
        catch (Exception ex)
        {
            string errormsg = ex.ToString();
        }


private byte[] HexString2Bytes(string hexString)
    {
        //check for null
        if (hexString == null) return null;
        //get length
        int len = hexString.Length;
        if (len % 2 == 1) return null;
        int len_half = len / 2;
        //create a byte array
        byte[] bs = new byte[len_half];
        try
        {
            //convert the hexstring to bytes
            for (int i = 0; i != len_half; i++)
            {
                bs[i] = (byte)Int32.Parse(hexString.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Exception : " + ex.Message);
        }
        //return the byte array
        return bs;
    }

命令十六进制字符串 A503CA002C000000E4411251C0000000B60000003C0050006100720061006D0073003E00200020003C0043006F006C002000690064003D00220044006500760069006300650073002F0050004800640073002F0031002F005000720069006E00740049006E0066006F0072006D006100740069006F006E002200200067006500740046006C006100670073003D002200320022002000670065007400440065007000740068003D0022002D003100220020002F003E003C002F0050006100720061006D0073003E000000

Answer 1

我其实不知道，为什么你必须做一个While循环。当您从服务器 readBytes 收到字节数时，您可以使用这样的编码完成代码：

string responseData = Encoding.ASCII.GetString(data,0,readbytes);

要获取更多信息，您可以在此链接中找到 https://docs.microsoft.com/en-us/dotnet/api/system.net.sockets.tcpclient?view=net-5.0

将十六进制字符串发送到TCP套接字

1 个答案: