在Windows CE 6.0 CF.NET 2.0上删除ARP条目 [英] Delete ARP entry on Windows CE 6.0 CF.NET 2.0

问题描述

我要解决的任务是向目标设备发送ARP请求.

the task I had to solve was to send an ARP request to a target device.

所以我开始在C#-Windows CE 6.0的CompactFramework.NET 2.0中P/调用SendARP.

So I started to P/Invoke SendARP in C# - CompactFramework.NET 2.0 for Windows CE 6.0.

[DllImport("iphlpapi.dll")]
private static extern int SendARP(uint destIp, uint srcIp, [Out] byte[] pMacAddr, ref int phyAddrLen);

认识到在所请求IP的条目已经存在的情况下使用了本地ARP缓存，我想手动删除此条目.

After recognising that the local ARP cache is used in case of an already existing entry of the requested IP I wanted to delete this entry manually.

因此，我开始使用来自 https://stackoverflow.com/a/1148861/3635715

So I started to acquire the IPNetTable by using the following code from https://stackoverflow.com/a/1148861/3635715

我最终成功地加载了MIB_IPNETROW，但是当我打电话时

I ended up to load my MIB_IPNETROW successfully, but when I call

[DllImport("iphlpapi.dll")]
private static extern int DeleteIpNetEntry(MIB_IPNETROW pArpEntry);

我收到ERROR_INVALID_PARAMETER异常(代码87).

I get an ERROR_INVALID_PARAMETER exception (code 87).

这是我的结构:(我测试了它的两个版本)

This is my struct: (I tested two versions of it)

[StructLayout(LayoutKind.Sequential)]
internal struct MIB_IPNETROW
{
    [MarshalAs(UnmanagedType.U4)] public int dwIndex;
    [MarshalAs(UnmanagedType.U4)] public int dwPhysAddrLen;
    [MarshalAs(UnmanagedType.U1)] public byte mac0;
    [MarshalAs(UnmanagedType.U1)] public byte mac1;
    [MarshalAs(UnmanagedType.U1)] public byte mac2;
    [MarshalAs(UnmanagedType.U1)] public byte mac3;
    [MarshalAs(UnmanagedType.U1)] public byte mac4;
    [MarshalAs(UnmanagedType.U1)] public byte mac5;
    [MarshalAs(UnmanagedType.U1)] public byte mac6;
    [MarshalAs(UnmanagedType.U1)] public byte mac7;
    [MarshalAs(UnmanagedType.U4)] public int dwAddr;
    [MarshalAs(UnmanagedType.U4)] public int dwType;
}

//[StructLayout(LayoutKind.Sequential)]
//internal struct MIB_IPNETROW
//{
//    [MarshalAs(UnmanagedType.U4)] public int dwIndex;
//    [MarshalAs(UnmanagedType.U4)] public int dwPhysAddrLen;
//    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] public byte[] bPhysAddr;
//    [MarshalAs(UnmanagedType.U4)] public int dwAddr;
//    [MarshalAs(UnmanagedType.U4)] public int dwType;
//}

最后但并非最不重要的功能:

And last but not least my function:

    private static void DeleteArpCache(string dstAddress, bool flush)
    {
        if (!string.IsNullOrEmpty(dstAddress))
        {
            IPAddress ipAddress = IPAddress.Parse(dstAddress);
            byte[] destination = ipAddress.GetAddressBytes();

            Log.DebugFormat("Try to get MIB_IPNETROW for IP [{0}]", dstAddress);
            MIB_IPNETROW? rowValue = GetRowByIpNetTable(destination);
            if (rowValue != null)
            {
                MIB_IPNETROW row = (MIB_IPNETROW) rowValue;

                if (flush)
                {
                    Log.DebugFormat("Try to delete ARP entries for Adapter Index {0}", row.dwIndex);
                    int result = FlushIpNetTable(row.dwIndex);
                    if (result == 0)
                    {
                        Log.Info("Deleted ARP entries successfully");
                    }
                    else
                    {
                        Log.ErrorFormat("Delete ARP entries failed with Code {0} for destination [{1}]", result,
                            dstAddress);
                    }
                }
                else
                {
                    Log.DebugFormat("Try to delete single ARP entry for IP [{0}]", dstAddress);
                    int result = DeleteIpNetEntry(row);
                    if (result == 0)
                    {
                        Log.Info("Deleted ARP entry successfully");
                    }
                    else
                    {
                        Log.ErrorFormat("Delete ARP entry failed with Code {0} for destination [{1}]", result,
                            dstAddress);
                    }
                }
            }
        }
    }

FlushIpNetTable就像一个魅力！ 那么，我在DeleteIpNetEntry的参数不匹配的原因可能是什么? 有人有类似的问题吗?

FlushIpNetTable works like a charm! So what could be the reason of my parameter mismatch at DeleteIpNetEntry? Has someone had a similar problem?

亲切的问候！

推荐答案

确实！ josef是对的，这个参数是ref ...

Indeed! josef is right, this param is ref ...

[DllImport("iphlpapi.dll")]
private static extern int DeleteIpNetEntry(ref MIB_IPNETROW pArpEntry);

非常感谢您！

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