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如何将整数赋给3字节的字段?

.net c#

Simsons · 技术社区 · 14 年前

我已使用大小检索了结构的大小,如下所示:

int len = Marshal.SizeOf(packet);

public struct TCP_CIFS_Packet
        {
           public byte zerobyte;
           public byte[] lengthCIFSPacket;
           public  CIFSPacket cifsPacket;
        }

我尝试分配如下值:

tcpCIFSPacket.lengthCIFSPacket = new byte[3];
tcpCIFSPacket.lengthCIFSPacket[0] = Convert.ToByte(0);
tcpCIFSPacket.lengthCIFSPacket[1] = Convert.ToByte(0);
tcpCIFSPacket.lengthCIFSPacket[2] = Convert.ToByte(40);

但这似乎不是正确的方法。我还有别的办法吗?

编辑@ho1和@Rune Grimstad: BitConverter.GetBytes 例如:

tcpCIFSPacket.lengthCIFSPacket = BitConverter.GetBytes(lengthofPacket);

lengthCIFSPacket 更改为4字节,但我只有3字节的空间 tcpCIFSPacket.lengthCIFSPacket 作为数据包结构。

3 回复 | 直到 13 年前

Kikaimaru 14 年前

        int number = 500000;
        byte[] bytes = new byte[3];
        bytes[0] = (byte)((number & 0xFF) >> 0);
        bytes[1] = (byte)((number & 0xFF00) >> 8);
        bytes[2] = (byte)((number & 0xFF0000) >> 16);

        byte[] bytes = BitConverter.GetBytes(number); // this will return 4 bytes of course

编辑:你也可以这样做

        byte[] bytes = BitConverter.GetBytes(number); 
        tcpCIFSPacket.lengthCIFSPacket = new byte[3];
        tcpCIFSPacket.lengthCIFSPacket[0] = bytes[0];
        tcpCIFSPacket.lengthCIFSPacket[1] = bytes[1];
        tcpCIFSPacket.lengthCIFSPacket[2] = bytes[2];