Question

我从互联网上学习编码，并尝试理解我从互联网上获得的代码。我从代码中复制了一个片段，因为我迷失了它。请帮帮我。

private byte[] get(string request, IPAddress ipAddress, string community, string mibstring)
    {
      byte[] buffer = new byte[1024]; 
      byte[] numArray1 = new byte[1024];
      int length1 = community.Length;
      string[] strArray = mibstring.Split('.');
      int length2 = strArray.Length;
      int index1 = 0;
      int num1 = length2;
      int num2 = 0;
      for (int index2 = 0; index2 < num1; ++index2)
      {
        int num3 = (int) Convert.ToInt16(strArray[index2]);
        if (num3 > (int) sbyte.MaxValue)
        {
          numArray1[index1] = Convert.ToByte(128 + num3 / 128);
          numArray1[index1 + 1] = Convert.ToByte(num3 - num3 / 128 * 128);
          index1 += 2;
          ++length2;
        }
        else
        {
          numArray1[index1] = Convert.ToByte(num3);
          ++index1;
        }
      }
      int size = 29 + length1 + length2 - 1;
      byte[] numArray2 = buffer;

我遇到这个缓冲的问题。如果我没错，这个缓冲区是一个1024 0元素的数组。

这个代码的作用是什么？：

  byte[] numArray2 = buffer;

名称没有索引。复制整个数组？

  byte[] numArray2 = buffer;
  int index3 = num2;
  int num4 = 1;
  int num5 = index3 + num4;
  int num6 = 48;
  numArray2[index3] = (byte) num6;
  byte[] numArray3 = buffer;
  int index4 = num5;
  int num7 = 1;
  int num8 = index4 + num7;
  int num9 = (int) Convert.ToByte(size - 2);
  numArray3[index4] = (byte) num9;
  byte[] numArray4 = buffer;
  int index5 = num8;
  int num10 = 1;
  int num11 = index5 + num10;
  int num12 = 2;
  numArray4[index5] = (byte) num12;
  byte[] numArray5 = buffer;
  int index6 = num11;
  int num13 = 1;
  int num14 = index6 + num13;
  int num15 = 1;
  numArray5[index6] = (byte) num15;
  byte[] numArray6 = buffer;
  int index7 = num14;
  int num16 = 1;
  int num17 = index7 + num16;
  int num18 = 0;
  numArray6[index7] = (byte) num18;
  byte[] numArray7 = buffer;
  int index8 = num17;
  int num19 = 1;
  int num20 = index8 + num19;
  int num21 = 4;
  numArray7[index8] = (byte) num21;
  byte[] numArray8 = buffer;
  int index9 = num20;
  int num22 = 1;
  int num23 = index9 + num22;
  int num24 = (int) Convert.ToByte(length1);
  numArray8[index9] = (byte) num24;
  foreach (byte @byte in Encoding.ASCII.GetBytes(community))
    buffer[num23++] = @byte;
  int num25;
  if (request == "get")
  {
    byte[] numArray9 = buffer;
    int index2 = num23;
    int num3 = 1;
    num25 = index2 + num3;
    int num26 = 160;
    numArray9[index2] = (byte) num26;
  }
  else
  {
    byte[] numArray9 = buffer;
    int index2 = num23;
    int num3 = 1;
    num25 = index2 + num3;
    int num26 = 161;
    numArray9[index2] = (byte) num26;
  }
  byte[] numArray10 = buffer;
  int index10 = num25;
  int num27 = 1;
  int num28 = index10 + num27;
  int num29 = (int) Convert.ToByte(20 + length2 - 1);
  numArray10[index10] = (byte) num29;
  byte[] numArray11 = buffer;
  int index11 = num28;
  int num30 = 1;
  int num31 = index11 + num30;
  int num32 = 2;
  numArray11[index11] = (byte) num32;
  byte[] numArray12 = buffer;
  int index12 = num31;
  int num33 = 1;
  int num34 = index12 + num33;
  int num35 = 4;
  numArray12[index12] = (byte) num35;
  byte[] numArray13 = buffer;
  int index13 = num34;
  int num36 = 1;
  int num37 = index13 + num36;
  int num38 = 0;
  numArray13[index13] = (byte) num38;
  byte[] numArray14 = buffer;
  int index14 = num37;
  int num39 = 1;
  int num40 = index14 + num39;
  int num41 = 0;
  numArray14[index14] = (byte) num41;
  byte[] numArray15 = buffer;
  int index15 = num40;
  int num42 = 1;
  int num43 = index15 + num42;
  int num44 = 0;
  numArray15[index15] = (byte) num44;
  byte[] numArray16 = buffer;
  int index16 = num43;
  int num45 = 1;
  int num46 = index16 + num45;
  int num47 = 1;
  numArray16[index16] = (byte) num47;
  byte[] numArray17 = buffer;
  int index17 = num46;
  int num48 = 1;
  int num49 = index17 + num48;
  int num50 = 2;
  numArray17[index17] = (byte) num50;
  byte[] numArray18 = buffer;
  int index18 = num49;
  int num51 = 1;
  int num52 = index18 + num51;
  int num53 = 1;
  numArray18[index18] = (byte) num53;
  byte[] numArray19 = buffer;
  int index19 = num52;
  int num54 = 1;
  int num55 = index19 + num54;
  int num56 = 0;
  numArray19[index19] = (byte) num56;
  byte[] numArray20 = buffer;
  int index20 = num55;
  int num57 = 1;
  int num58 = index20 + num57;
  int num59 = 2;
  numArray20[index20] = (byte) num59;
  byte[] numArray21 = buffer;
  int index21 = num58;
  int num60 = 1;
  int num61 = index21 + num60;
  int num62 = 1;
  numArray21[index21] = (byte) num62;
  byte[] numArray22 = buffer;
  int index22 = num61;
  int num63 = 1;
  int num64 = index22 + num63;
  int num65 = 0;
  numArray22[index22] = (byte) num65;
  byte[] numArray23 = buffer;
  int index23 = num64;
  int num66 = 1;
  int num67 = index23 + num66;
  int num68 = 48;
  numArray23[index23] = (byte) num68;
  byte[] numArray24 = buffer;
  int index24 = num67;
  int num69 = 1;
  int num70 = index24 + num69;
  int num71 = (int) Convert.ToByte(6 + length2 - 1);
  numArray24[index24] = (byte) num71;
  byte[] numArray25 = buffer;
  int index25 = num70;
  int num72 = 1;
  int num73 = index25 + num72;
  int num74 = 48;
  numArray25[index25] = (byte) num74;
  byte[] numArray26 = buffer;
  int index26 = num73;
  int num75 = 1;
  int num76 = index26 + num75;
  int num77 = (int) Convert.ToByte(6 + length2 - 1 - 2);
  numArray26[index26] = (byte) num77;
  byte[] numArray27 = buffer;
  int index27 = num76;
  int num78 = 1;
  int num79 = index27 + num78;
  int num80 = 6;
  numArray27[index27] = (byte) num80;
  byte[] numArray28 = buffer;
  int index28 = num79;
  int num81 = 1;
  int num82 = index28 + num81;
  int num83 = (int) Convert.ToByte(length2 - 1);
  numArray28[index28] = (byte) num83;
  byte[] numArray29 = buffer;
  int index29 = num82;
  int num84 = 1;
  int num85 = index29 + num84;
  int num86 = 43;
  numArray29[index29] = (byte) num86;
  for (int index2 = 2; index2 < length2; ++index2)
    buffer[num85++] = Convert.ToByte(numArray1[index2]);
  byte[] numArray30 = buffer;
  int index30 = num85;
  int num87 = 1;
  int num88 = index30 + num87;
  int num89 = 5;
  numArray30[index30] = (byte) num89;
  byte[] numArray31 = buffer;
  int index31 = num88;
  int num90 = 1;
  int num91 = index31 + num90;
  int num92 = 0;
  numArray31[index31] = (byte) num92;
  Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
  socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3500);
  IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, 161);
  EndPoint remoteEP = (EndPoint) ipEndPoint;
  socket.SendTo(buffer, size, SocketFlags.None, (EndPoint) ipEndPoint);
  try
  {
    socket.ReceiveFrom(buffer, ref remoteEP);
  }
  catch (SocketException ex)
  {
    buffer[0] = byte.MaxValue;
  }
  return buffer;
}

我在这段代码中完全丢失了。此代码逐个获取网络打印机计数器。我不知道它是怎么做的。

这是调用方法：

byte[] numArray2 = this.get("get", machineIPAddress, "public",    "1.3.6.1.2.1.43.10.2.1.4.1.1");

Answer 1

打破这一行：

byte[] numArray2 = buffer;

它会在内存中为引用
它声明引用将是byte[]
它将名称numArray2附加到该引用
最后，它会将参考buffer的值复制到引用numArray2。 现在两个变量都指向同一个对象。

这段代码做了什么？

1 个答案: