BinaryWriter问题-“代码在Write()方法之间添加了一些字节" [英] BinaryWriter problem - "code adds some byte between Write() method"

问题描述

我尝试使用BinaryWriter然后使用BinaryReader编写一些代码. 当我想写时，我使用方法Write(). 但是问题在于，在两行Write方法之间出现了一个新的字节，该字节在ASCII表中为十进制31(例程24). 您可以在这张图片上看到它:

I am try to do some code using BinaryWriter and Then BinaryReader. When I wanna write I use method Write(). But the problem is that between two lines of Write method there appears a new byte which is in ASCII table in decimal 31 (sometines 24). You can see it on this image:

您会看到索引4(第5个字节)处的字节是ASCII十进制值31.我没有在此处插入.如您所见，第1个4个字节保留给一个数字(Int32)，其次是其他数据(主要是一些文本-现在这并不重要).

You can see that byte at index 4 (5th byte) is of ASCII decimal value 31. I didnt insert it there. As you can see 1st 4 bytes are reserved for a number (Int32), next are other data (some text mostly - this is not important now).

从我写的代码中可以看到: -进入第一行的数字为10 -在第二行文字这是一些文字..."

As you can see from the code i write: - into 1st line a number 10 - into 2nd line text "This is some text..."

介于这之间的第5个字节(12月31日)是怎么来的?

这是我的代码:

static void Main(string[] args)
    {           
        //
        //// SEND - RECEIVE:
        //
        SendingData();
        Console.ReadLine();
    }

    private static void SendingData()
    {
        int[] commandNumbers = { 1, 5, 10 }; //10 is for the users (when they send some text)!

        for (int i = 0; i < commandNumbers.Length; i++)
        {
            //convert to byte[]
            byte[] allBytes;
            using (MemoryStream ms = new MemoryStream())
            {
                using (BinaryWriter bw = new BinaryWriter(ms))
                {
                    bw.Write(commandNumbers[i]);   //allocates 1st 4 bytes - FOR MAIN COMMANDS!
                    if (commandNumbers[i] == 10)
                        bw.Write("This is some text at command " + commandNumbers[i]); //HERE ON THIS LINE IS MY QUESTION!!!
                }
                allBytes = ms.ToArray();
            }

            //convert back:
            int valueA = 0;
            StringBuilder sb = new StringBuilder();
            foreach (var b in GetData(allBytes).Select((a, b) => new { Value = a, Index = b }))
            {
                if (b.Index == 0) //1st num
                    valueA = BitConverter.ToInt32(b.Value, 0);
                else //other text
                {
                    foreach (byte _byte in b.Value)
                        sb.Append(Convert.ToChar(_byte));
                }
            }

            if (sb.ToString().Length == 0)
                sb.Append("ONLY COMMAND");
            Console.WriteLine("Command = {0} and Text is \"{1}\".", valueA, sb.ToString());
        }
    }

    private static IEnumerable<byte[]> GetData(byte[] data)
    {
        using (MemoryStream ms = new MemoryStream(data))
        {
            using (BinaryReader br = new BinaryReader(ms))
            {
                int j = 0;
                byte[] buffer = new byte[4];
                for (int i = 0; i < data.Length; i++)
                {
                    buffer[j++] = data[i];
                    if (i == 3) //SENDING COMMAND DATA
                    {
                        yield return buffer;
                        buffer = new byte[1];
                        j = 0;
                    }
                    else if (i > 3) //SENDING TEXT
                    {
                        yield return buffer;
                        j = 0;
                    }
                }
            }
        }
    }

推荐答案

如果您查看

If you look at the documentation for Write(string), you'll see that it writes a length-prefixed string. So the 31 is the number of characters in your string -- perfectly normal.

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