C#套接字接收字节数组长度 [英] c# socket receive byte array length

问题描述

我正在尝试学习在C#中使用套接字，我对此表示怀疑，我正在使用类似以下的代码:

i'm trying to learn to use sockets in c# and i've a doubt, i'm using a code something like this:

byte[] data = new byte[64]; 
int length = 0;
length = sock.Receive(data);
//more code...

因此，byte[]数据填充有接收到的数据，数组的左侧空间填充了0s，byte[]是否已完全分配到内存中(全部64个字节)?如果是这样，是否有办法使byte[]的大小与实际发送的数据相同?

So, the byte[] data is filled with the recived data and the left space in the array is filled with 0s, Is the byte[] allocated into memory completely (all 64bytes)? If it's so, is there a way to make the byte[] the same size as the actual sent data?

推荐答案

您可以检查sock.Available来查看已包含的内容.(到目前为止)

You can check sock.Available to see what has already come in. (so far)

byte[] data = new byte[sock.Available]; 
int length = sock.Receive(data);
//more code...

注意:由于您可能知道或可能不知道网络接下来会发生什么，因此通常更有意义的做法是先只读取一个标头(带有大小信息)，或者分配超出必要的空间，然后多次调用.Recieve()直到达到记录结束的时间.

Note: Since you may or may not know what is coming in next on the network it usually makes more sense to read only a header (with size info) first or to allocate more space than necessary, and call .Recieve() multiple times until the end of a record is reached.

注意:此代码假定您已经知道要接收一些数据，并且已经等待了足够长的时间以准备一些有用的数据.

Note: This code assumes you already know there is some data to receive and you've waited long enough for some useful amount of data to be ready.

如果确实选择使用长度标题，则.Available可以帮助您避免读取部分标题，而不必重新组装它，这很好. (在这种情况下，只有大邮件可能需要手动重组)

If you do choose to use length headers, .Available can help you avoid reading a partial header and having to re-assemble it which is nice. (Only large messages may need manual reassembly in that case)

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