TCP客户端接收数据不正确
本文关键字:数据 不正确 端接 客户 客户端 TCP | 更新日期: 2023-09-27 18:34:01
不确定这是TCPClient还是其他东西,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,但是我的软件接收数据不正确。
让我解释一下,我传输一个查询字节 (05) 我得到一个确认 (06),然后我传输一些以 9B 字节开头的数据,一旦发送,我应该收到一个 06 字节,然后在那个字节之后我应该得到一个 C5 字节,但是根据我的软件,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();
}
}
根据嗅探器的说法,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?另外,如果您对如何改进代码有任何建议,我将不胜感激
在这里:你输出了错误的缓冲区:
gs.Read(resp, 0, resp.Length);
gs.Flush();
outputByte(buff, "Rec"); <==== should be "resp"
然而!!!
所有 Read 调用都已中断;它们必须处理返回值,尤其是在读取多个字节时。数据包碎片会杀死您的代码。
正确的"准确读取 [n] 个字节"方法是:
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);
将正确填充它,如果流中没有足够的数据,则出错。