clientStream.Read返回错误的字节数 [英] clientStream.Read returns wrong number of bytes

问题描述

此代码有效:

TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
byte[] message = new byte[5242880];
int bytesRead;

bytesRead = clientStream.Read(message, 0, 909699);

但这会返回错误的字节数:

But this returns the wrong number of bytes:

bytesRead = clientStream.Read(message, 0, 5242880);

为什么?我该如何解决?

Why? How can I fix it?

(实际数据大小为1475186；代码返回11043作为字节数)

(the real data size is 1475186; the code returns the 11043 as the number of bytes)

推荐答案

如果这是基于TCP的流，那么答案是其余数据根本还没有到达.

If this is a TCP based stream, then the answer is that the rest of the data simply didn't arrive yet.

TCP是面向流的.这意味着 Send / Write 调用的数量与接收事件的数量之间没有关系.可以将多个写操作组合在一起，并且可以将单个写操作拆分.

TCP is stream oriented. That means there is no relation between the number of Send/Write calls, and the number of receive events. Multiple writes can be combined together, and single writes can be split.

如果要在TCP上使用消息，则需要在其之上实现自己的打包算法.实现这一目标的典型策略是:

If you want to work with messages on TCP, you need to implement your own packeting algorithm on top of it. Typical strategies to achieve this are:

1. 按长度打包每个前缀，通常使用二进制数据
2. 使用分隔符，例如换行符.通常与文本数据一起使用.

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如果要以阻塞方式读取所有数据，则可以使用循环，直到 DataAvailable 为 true ，但随后对 Read 的调用返回 0 .(希望我没记错，已经有一段时间没有进行任何网络编程了.)

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If you want to read all data in a blocking way you can use loop until DataAvailable is true but a subsequent call to Read returns 0. (Hope I remembered that part correctly, haven't done any network programming in a while)

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