/// <summary>
/// 获取一次Tcp端口快照信息
/// </summary>
/// <param name="ipVersion">ip版本</param>
/// <returns></returns>
public unsafe static PortOwnerPid[] Snapshot(AddressFamily ipVersion)
{
var size = 0;
var TCP_TABLE_OWNER_PID_ALL = 5;
TcpSnapshot.GetExtendedTcpTable(null, &size, false, ipVersion, TCP_TABLE_OWNER_PID_ALL, 0);
var pTable = stackalloc byte[size];
var state = TcpSnapshot.GetExtendedTcpTable(pTable, &size, false, ipVersion, TCP_TABLE_OWNER_PID_ALL, 0);
if (state != 0)
{
return(new PortOwnerPid[0]);
}
var hashSet = new HashSet <PortOwnerPid>();
var rowLength = *(int *)(pTable);
var pRow = pTable + Marshal.SizeOf(rowLength);
for (int i = 0; i < rowLength; i++)
{
var row = *(MIB_TCPROW_OWNER_PID *)pRow;
var port = ByteConverter.ToBytes(row.LocalPort, Endians.Little);
var portOwner = new PortOwnerPid
{
Port = ByteConverter.ToUInt16(port, 0, Endians.Big),
OwerPid = (int)row.OwningPid
};
hashSet.Add(portOwner);
pRow = pRow + Marshal.SizeOf(typeof(MIB_TCPROW_OWNER_PID));
}
return(hashSet.OrderBy(item => item.Port).ToArray());
}
/// <summary>
/// 从流中读取2个字节，并将流内的位置向前推进2个字节，
/// 返回其UInt16表示类型
/// </summary>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <returns></returns>
public uint ReadUInt16()
{
var range = this.ReadByteRange(sizeof(ushort));
return(ByteConverter.ToUInt16(range.Buffer, range.Offset, this.Endian));
}