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WSAStringToAddress (ws2_32)
The WSAStringToAddress function converts a network address in its standard text presentation form into its numeric binary form in a sockaddr structure, suitable for passing to Windows Sockets routines that take such a structure.

C# Signature:

    /* converts a network address in its standard text presentation form into its numeric binary form in a sockaddr structure.  */
    [ DllImport ( "Ws2_32.dll",
              CharSet = CharSet.Unicode,
              EntryPoint = "WSAStringToAddressW" ) ]
    public static extern uint WSAStringToAddress (
                      string        AddressString,
                      ADDRESS_FAMILIES    AddressFamily,
                      IntPtr        lpProtocolInfo,
                      ref sockaddr_in6    pAddr,
                      ref int        lpAddressLength);

VB Signature:

Declare Function WSAStringToAddress Lib "ws2_32.dll" (TODO) As TODO


  • addressStrings: A pointer to the string that contains the network address to convert.
  • addressFamily: The address family of the network address
  • lpProtocolInfo: The WSAPROTOCOL_INFO structure associated with the provider to be used. If this is NULL, the call is routed to the provider of the first protocol supporting the indicated AddressFamily.
  • socketAddress: A pointer to a buffer that is filled with a sockaddr structure for the address string if the function succeeds.
  • socketAddressSize: A pointer to the length, in bytes, of the buffer pointed to by the lpAddress parameter.


The application must first call WSAStartup before calling WSAStringToAddress.

Sample Code:

    WSADATA data = new WSADATA();
    SockAddr sockAddr = new SockAddr();
    IntPtr pSockAddr = IntPtr.Zero;

    if (WSAStartup(0x201, ref data) == ERROR_SUCCESS)
        int sockAddrSize = Marshal.SizeOf(sockAddr);

        int result = WSAStringToAddress(
        ref sockAddr,
        ref sockAddrSize);


    if (result != ERROR_SUCCESS)
         throw new Win32Exception(result);

    pSockAddr = Marshal.AllocHGlobal(Marshal.SizeOf(sockAddr));
    Marshal.StructureToPtr(sockAddr, pSockAddr, true);


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