如何阅读内存流中的短片？ [英] How to read short in memorystream?

问题描述

您好我尝试读取十六进制的2字节标题，如

Hi im try to read 2 bytes header in hex like this

52 01

但

but

MemoryStream

只允许使用ReadByte（）。



这是我的代码

just allow ReadByte() only.

this is my code

ushort size = BitConverter.ToUInt16(new byte[] { (byte)ReceiveStream.ReadByte(), (byte)ReceiveStream.ReadByte() }, 0);
                ReceiveStream.Position -= 2;

                while (size > 0 && size <= (ReceiveStream.Length - ReceiveStream.Position))
                {
                    //Log.Debug("Read: " + size + "-byte packet.");

                    // Read Packet Data including length
                    byte[] data = new byte[size];
                    ReceiveStream.Read(data, 0, size);

                    // Process packet.
                    MemoryStream stream = new MemoryStream(data, 2, data.Length - 2, false);

                    int opcode = stream.ReadByte();//TODO i want to read 2 bytes
                    
					//other code call the opcode value
                }

这是我的问题：

this is my problem:

int opcode = stream.ReadByte();

操作码值必须是152，就像我给出的标题值一样。但是我的代码只读了52。



我需要一些帮助xD



我尝试过：

the opcode value must be "152" like the header value i've give. But my code just read "52" only.

I need some help xD

What I have tried:

ushort size = BitConverter.ToUInt16(new byte[] { (byte)ReceiveStream.ReadByte(), (byte)ReceiveStream.ReadByte() }, 0);
                ReceiveStream.Position -= 2;

                while (size > 0 && size <= (ReceiveStream.Length - ReceiveStream.Position))
                {
                    //Log.Debug("Read: " + size + "-byte packet.");

                    // Read Packet Data including length
                    byte[] data = new byte[size];
                    ReceiveStream.Read(data, 0, size);

                    // Process packet.
                    MemoryStream stream = new MemoryStream(data, 2, data.Length - 2, false);

                    int opcode = stream.ReadByte();//TODO i want to read 2 bytes
                    
					//other code call the opcode value
                }

推荐答案

从流中读取两个字节并进行转换他们自己知道字节顺序应该是什么：

Read two bytes from the stream and either convert them yourself as you know what the byte order should be:

byte a = 52;
byte b = 1;
ushort result = (ushort)((int) a | (b << 8));

您可以读取2个字节并自行进行位移或使用 BinaryReader ： BinaryReader类（System.IO） [ ^ ]

You can read 2 bytes and do the bit shifting yourself or use BinaryReader : BinaryReader Class (System.IO)[^]

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