tcpclient接收数据不正确

时间:2012-05-14 11:41:25

标签: c# tcpclient

不确定这是TCPClient还是其他什么,我使用网络嗅探器检查从服务器发送和接收的内容,数据是否正确,但我的软件接收数据不正确。

让我解释一下,我发送一个查询字节(05)我得到一个确认回(06)然后我发送一些以9B字节开头的数据,一旦发送,我应该接收一个06字节,然后那个字节我应该得到一个C5字节,但根据我的软件,我得到另一个06字节,根据嗅探器的情况并非如此!

byte[] buff;
if (!this.isConnected())
    this.connect(); 

NetworkStream gs = _Socket.GetStream();

gs.Write(enq, 0, enq.Length);
gs.Flush();
outputByte(enq, "Trans"); //outputs ---> 05

buff = new byte[1];
gs.Read(buff, 0, buff.Length);
gs.Flush();
outputByte(buff, "Rec");// outputs <--- 06

if (buff[0] == 0x06)
{
    byte[] data = new byte[] {
                                            0x9B, 0x00,         0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x09,         
        0x67, 0x11, 0x01, 0x49, 0x4D, 0x41, 0x47, 0x45,         0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,         
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,         0x01, 0x53, 0x75, 0x6D, 0x6D, 0x61, 0x72, 0x79,         
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,         
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,         0x00, 0x00, 0x02, 0x08, 0x00, 0x00, 0x08, 0x00,         
        0x00, 0x00, 0x1F, 0x09, 0x01, 0x00, 0x04, 0x0A,         0x10, 0x00, 0x12, 0x01, 0x1F, 0x00, 0x00, 0x00,         
        0x05, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,         0x12, 0x10, 0x1E, 0x0E, 0x1E, 0x54, 0x65, 0x73,         
        0x74, 0x69, 0x6E, 0x67, 0x10, 0x00, 0x12, 0x01,         0x1F, 0x00, 0x00, 0x00, 0x05, 0x00, 0x01, 0x00,         
        0x00, 0x00, 0x00, 0x00, 0x12, 0x10, 0x0D, 0x00,         0x00, 0x90
    };
    outputByte(data, "Trans"); /outputs --> with above byte information
    gs.Write(data, 0, data.Length);
    gs.Flush();

    buff = new byte[1];
    gs.Read(buff, 0, buff.Length);
    gs.Flush();
    // this is the first receive of 06
    outputByte(buff, "Rec");//outputs <--- 06

    if (buff[0] == 0x06)
    {
        gs.Flush();
        Console.WriteLine("fdsfsdfs");
        byte[] resp = new byte[5];
        gs.Read(resp, 0, resp.Length);
        gs.Flush();
        //this outputs <--- 06 but it should be showing <--- c5000100c4
        outputByte(buff, "Rec"); 
        gs.Write(ack, 0, ack.Length);
        outputByte(ack, "Trans");
        gs.Flush();
    }
}

根据嗅探器,这是应该发生的事情

---> 05
<--- 06
---> 9b008000000080000009671101494d414745310000000000000000000000000000000153756d6d617279000000000000000000000000000000000000000000000000000002080000080000001f090100040a100012011f000000050001000000000012101e0e1e54657374696e67100012011f000000050001000000000012100d000090
<--- 06
<--- c5000100c4

根据软件,这就是正在发生的事情

---> 05
<--- 06
---> 9b008000000080000009671101494d414745310000000000000000000000000000000153756d6d617279000000000000000000000000000000000000000000000000000002080000080000001f090100040a100012011f000000050001000000000012101e0e1e54657374696e67100012011f000000050001000000000012100d000090
<--- 06
<--- 06

有什么想法吗?如果您对如何改进代码有任何建议,我将不胜感激

1 个答案:

答案 0 :(得分:6)

这里:你输出了错误的缓冲区:

    gs.Read(resp, 0, resp.Length);
    gs.Flush();

    outputByte(buff, "Rec");  <==== should be "resp"

无论其!!!

所有的阅读电话都被打破了;当读取多个字节时,必须处理返回值,尤其是。数据包碎片会破坏您的代码。

正确的“读取完全[n]字节”方法将是:

public static void ReadExact(this Stream stream, byte[] buffer,
           int offset, int count) {
    int read;
    while(count > 0 && (read = stream.Read(buffer, offset, count)) > 0) {
        count -= read;
        offset += read;
    }
    if(count != 0) throw new EndOfStreamException();
}

然后:

gs.ReadExact(resp, 0, resp.Length);

将正确填充,如果流中的数据不足,则会出错。