原文地址：http://blog.csdn.net/yulinlover/archive/2009/02/08/3868824.aspx
public class NativeFunc
{
[StructLayout(LayoutKind.Sequential)]
public class MIB_TCPROW
{
public int dwState;
public int dwLocalAddr;
public int dwLocalPort;
public int dwRemoteAddr;
public int dwRemotePort;
}
[StructLayout(LayoutKind.Sequential)]
public class MIB_TCPTABLE
{
public int dwNumEntries;
public MIB_TCPROW[] table;
}
[DllImport("Iphlpapi.dll")]
static extern int GetTcpTable(IntPtr pTcpTable, ref int pdwSize, bool bOrder);
[DllImport("Iphlpapi.dll")]
static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 MacAddr, ref Int32 PhyAddrLen);
[DllImport("Ws2_32.dll")]
static extern Int32 inet_addr(string ipaddr);
[DllImport("Ws2_32.dll")]
static extern ushort ntohs(ushort netshort);
//SendArp獲取MAC地址
public static string GetMacAddress(string macip)
{
StringBuilder strReturn = new StringBuilder();
try
{
Int32 remote = inet_addr(macip);
Int64 macinfo = new Int64();
Int32 length = 6;
SendARP(remote, 0, ref macinfo, ref length);
string temp = System.Convert.ToString(macinfo, 16).PadLeft(12, '0').ToUpper();
int x = 12;
for (int i = 0; i < 6; i++)
{
if (i == 5) { strReturn.Append(temp.Substring(x - 2, 2)); }
else { strReturn.Append(temp.Substring(x - 2, 2) + ":"); }
x -= 2;
}
return strReturn.ToString();
}
catch
{
return string.Empty;
}
}
public static bool IsHostAlive(string strHostIP)
{
string strHostMac = GetMacAddress(strHostIP);
return !string.IsNullOrEmpty(strHostMac);
}
public static MIB_TCPTABLE GetTcpTableInfo()
{
//聲明一個指針準(zhǔn)備接受Tcp連接信息
IntPtr hTcpTableData = IntPtr.Zero;
//聲明hTcpTableData指針?biāo)赶虻膬?nèi)存緩沖區(qū)大小
int iBufferSize = 0;
//聲明MIB_TCPTABLE對象，作為返回值
MIB_TCPTABLE tcpTable = new MIB_TCPTABLE();
//聲明一個List對象來臨時存放MIB_TCPROW對象
List<MIB_TCPROW> lstTcpRows = new List<MIB_TCPROW>();
//調(diào)用API來獲得真正的緩沖區(qū)大小，iBufferSize默認(rèn)為0，
//這時調(diào)用API GetTcpTable會觸發(fā)一個異常ERROR_INSUFFICIENT_BUFFER
//通過這個異常系統(tǒng)會把真正的緩沖長度返回
GetTcpTable(hTcpTableData, ref iBufferSize, false);
//為托管指針在堆上分配內(nèi)存
hTcpTableData = Marshal.AllocHGlobal(iBufferSize);
//求得MIB_TCPROW對象的內(nèi)存字節(jié)數(shù)
int iTcpRowLen = Marshal.SizeOf(typeof(MIB_TCPROW));
//根據(jù)上面得到的緩沖區(qū)大小來推算MIB_TCPTABLE里的MIB_TCPROW數(shù)組長度
//下面用緩沖長度-sizeof(int)也就是去掉MIB_TCPTABLE里的成員dwNumEntries所占用的內(nèi)存字節(jié)數(shù)
int aryTcpRowLength = (int)Math.Ceiling((double)(iBufferSize - sizeof(int)) / iTcpRowLen);
//重新取得TcpTable的數(shù)據(jù)
GetTcpTable(hTcpTableData, ref iBufferSize, false);
//下面是關(guān)鍵，由于MIB_TCPTABLE里的成員有一個是數(shù)組，而這個數(shù)組長度起初我們是不能確定的
//所以這里我們只能根據(jù)分配的指針來進(jìn)行一些運算來推算出我們所要的數(shù)據(jù)
for (int i = 0; i < aryTcpRowLength; i++)
{
//hTcpTableData是指向MIB_TCPTABLE緩沖區(qū)的內(nèi)存起始區(qū)域，由于其成員數(shù)據(jù)在內(nèi)存中是順序排列
//所以我們可以推斷hTcpTableData+4(也就是sizeof(dwNumEntries)的長度)后就是MIB_TCPROW數(shù)組的第一個元素
IntPtr hTempTableRow = new IntPtr(hTcpTableData.ToInt32() + 4 + i * iTcpRowLen);
MIB_TCPROW tcpRow = new MIB_TCPROW();
tcpRow.dwLocalAddr = 0;
tcpRow.dwLocalPort = 0;
tcpRow.dwRemoteAddr = 0;
tcpRow.dwRemotePort = 0;
tcpRow.dwState = 0;
//把指針數(shù)據(jù)拷貝到我們的結(jié)構(gòu)對象里。
Marshal.PtrToStructure(hTempTableRow, tcpRow);
lstTcpRows.Add(tcpRow);
}
tcpTable.dwNumEntries = lstTcpRows.Count;
tcpTable.table = new MIB_TCPROW[lstTcpRows.Count];
lstTcpRows.CopyTo(tcpTable.table);
return tcpTable;
}
public static string GetIpAddress(long ipAddrs)
{
try
{
System.Net.IPAddress ipAddress = new System.Net.IPAddress(ipAddrs);
return ipAddress.ToString();
}
catch { return ipAddrs.ToString(); }
}
public static ushort GetTcpPort(int tcpPort)
{
return ntohs((ushort)tcpPort);
}
public static bool IsPortBusy(int port)
{
MIB_TCPTABLE tcpTableData = GetTcpTableInfo();
return false;
}
} 下面我再把調(diào)用的方式順便寫一下
private void button1_Click(object sender, EventArgs e)
{
NativeFunc.MIB_TCPTABLE tcpTableData = new NativeFunc.MIB_TCPTABLE();
tcpTableData = NativeFunc.GetTcpTableInfo();
for (int i = 0; i < tcpTableData.dwNumEntries; i++)
{
this.richTextBox1.AppendText(string.Format("{0}:{1}-->>{2}:{3}\n",
NativeFunc.GetIpAddress(tcpTableData.table[i].dwLocalAddr),
NativeFunc.GetTcpPort(tcpTableData.table[i].dwLocalPort).ToString(),
NativeFunc.GetIpAddress(tcpTableData.table[i].dwRemoteAddr),
NativeFunc.GetTcpPort(tcpTableData.table[i].dwRemotePort).ToString()));
}
}
代碼下載 也可以使用cmd命令，Netstat
具體參考：
http://www.cnblogs.com/honour/archive/2008/08/04/1260206.html
posted on 2010-06-13 17:12
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