unsafe static MIB_TCPROW2[] GetTcpRows()
{
uint sizePointer = 0;
const bool order = false;
NativeMethods.GetTcpTable2(null, ref sizePointer, order);
var rawTableBytes = new byte[sizePointer];
fixed(byte *ptbl = rawTableBytes)
{
uint error = NativeMethods.GetTcpTable2((MIB_TCPTABLE2 *)ptbl, ref sizePointer, order);
Debug.Assert(error == 0);
if (error != 0)
{
return(Array.Empty <MIB_TCPROW2>());
}
int elems = (int)((MIB_TCPTABLE2 *)ptbl)->dwNumEntries;
var res = new MIB_TCPROW2[elems];
var pelem = (MIB_TCPROW2 *)(ptbl + 4);
var p = ptbl + 4;
for (int i = 0; i < res.Length; i++, p += MIB_TCPROW2.SIZE)
{
res[i] = *(MIB_TCPROW2 *)p;
}
return(res);
}
}
public static List <int> GetPortByProcessId(int pid)
{
List <int> ports = new List <int>();
int nBufSize = 0;
int err = GetTcpTable2(IntPtr.Zero, ref nBufSize, false);
if (err == 0x7a) // ERROR_INSUFFICIENT_BUFFER
{
IntPtr pBuf = Marshal.AllocHGlobal(nBufSize);
try {
err = GetTcpTable2(pBuf, ref nBufSize, false);
if (err == 0)
{
int entrySize = Marshal.SizeOf(typeof(MIB_TCPROW2));
int nEntries = Marshal.ReadInt32(pBuf);
int tableStartAddr = (int)pBuf + sizeof(int);
for (int i = 0; i < nEntries; i++)
{
IntPtr pEntry = (IntPtr)(tableStartAddr + i * entrySize);
MIB_TCPROW2 tcpData = (MIB_TCPROW2)Marshal.PtrToStructure(pEntry, typeof(MIB_TCPROW2));
if (tcpData.dwOwningPid == pid)
{
ports.Add(ntohs((ushort)tcpData.dwLocalPort));
}
}
}
else
{
throw new Win32Exception(err);
}
} finally {
if (pBuf != IntPtr.Zero)
{
Marshal.FreeHGlobal(pBuf);
}
}
}
else
{
throw new Win32Exception(err);
}
return(ports.Distinct().ToList());
}
