/// <summary>
/// 获取所有 UDP 连接对象
/// </summary>
/// <returns></returns>
private static UDPRow[] GetAllUdpConnections()
{
UDPRow[] tTable;
int AF_INET = 2; // IPv4
int buffSize = 0;
GetExtendedUdpTable(IntPtr.Zero, ref buffSize, true, AF_INET, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID); // 获取 buffsize 大小
IntPtr buffTable = Marshal.AllocHGlobal(buffSize);
try
{
uint ret = GetExtendedUdpTable(buffTable, ref buffSize, true, AF_INET, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID);
if (ret != 0)
{
return(null);
}
UDPTable tab = (UDPTable)Marshal.PtrToStructure(buffTable, typeof(UDPTable));
IntPtr rowPtr = (IntPtr)((long)buffTable + Marshal.SizeOf(tab.dwNumEntries));
tTable = new UDPRow[tab.dwNumEntries];
for (int i = 0; i < tab.dwNumEntries; i++)
{
UDPRow udpRow = (UDPRow)Marshal.PtrToStructure(rowPtr, typeof(UDPRow));
tTable[i] = udpRow;
rowPtr = (IntPtr)((long)rowPtr + Marshal.SizeOf(udpRow)); // next entry
}
}
finally
{
Marshal.FreeHGlobal(buffTable);
}
return(tTable);
}
/// <summary>
/// 获取特定 UDP 连接对象
/// </summary>
/// <param name="PID">进程 PID</param>
/// <returns></returns>
private static List <UDPRow> GetSpecUDPConnection(int PID)
{
int AF_INET = 2; // IPv4
int BuffSize = 0; // 缓冲区大小
List <UDPRow> Target = new List <UDPRow>();
GetExtendedUdpTable(IntPtr.Zero, ref BuffSize, true, AF_INET, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID); // 获取 BuffSize 大小
IntPtr Buffer = Marshal.AllocHGlobal(BuffSize); // 分配内存空间
try
{
if (GetExtendedUdpTable(Buffer, ref BuffSize, true, AF_INET, UDP_TABLE_CLASS.UDP_TABLE_OWNER_PID) != 0)
{
return(null);
}
UDPTable udpTable = (UDPTable)Marshal.PtrToStructure(Buffer, typeof(UDPTable));
IntPtr RowPtr = (IntPtr)((long)Buffer + Marshal.SizeOf(udpTable.dwNumEntries));
for (int i = 0; i < udpTable.dwNumEntries; i++)
{
UDPRow udpRow = (UDPRow)Marshal.PtrToStructure(RowPtr, typeof(UDPRow));
if (udpRow.PID == PID)
{
Target.Add(udpRow);
}
RowPtr = (IntPtr)((long)RowPtr + Marshal.SizeOf(udpRow)); // next entry
}
}
finally
{
Marshal.FreeHGlobal(Buffer);
}
return(Target);
}