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/**************************************************************
connect to a IPv6
***************************************************************
*/
ConnectToAddress(IPAddress, Port){
    VarSetCapacity(wsaData, 32)  ; The struct is only about 14 in size, so 32 is conservative.
    ;ipv6 requires wsock 2.2
    WSOCK_20    := 0x0002 ;wsock 2.0
    WSOCK_22    := 0x0202 ;wsock 2.2
    result := DllCall("Ws2_32\WSAStartup", "UShort", 0x0202, "UInt", &wsaData) ; Request Winsock 2.0 (0x0202)
    ; Since WSAStartup() will likely be the first Winsock function called by this script,
    ; check ErrorLevel to see if the OS has Winsock 2.2 available:
    if (ErrorLevel){
        MsgBox WSAStartup() could not be called due to error %ErrorLevel%. Winsock 2.0 or higher is required.
        return -1
    }
    if (result){  ; Non-zero, which means it failed (most Winsock functions return 0 upon success).
        MsgBox % "WSAStartup() indicated Winsock error " . DllCall("Ws2_32\WSAGetLastError")
        return -1
    }

    AF_INET     := 2    ;for IPv4
    AF_INET6    := 23   ;for IPv6
    SOCK_STREAM := 1
    IPPROTO_TCP := 6
    socket := DllCall("Ws2_32\socket", "Int", AF_INET6, "Int", SOCK_STREAM, "Int", IPPROTO_TCP)
    if socket = -1
    {
        MsgBox % "socket() indicated Winsock error " . DllCall("Ws2_32\WSAGetLastError")
        return -1
    }

;...until here it works, but now I need the sockaddr_in6 Data-struct.

   
    /* struct def postet by Lexicos
typedef struct sockaddr_in6 {
    ADDRESS_FAMILY sin6_family; // AF_INET6.
    USHORT sin6_port;           // Transport level port number.
    ULONG  sin6_flowinfo;       // IPv6 flow information.
    IN6_ADDR sin6_addr;         // IPv6 address.
    union {
        ULONG sin6_scope_id;     // Set of interfaces for a scope.
        SCOPE_ID sin6_scope_struct;
    };
} SOCKADDR_IN6_LH, *PSOCKADDR_IN6_LH, FAR *LPSOCKADDR_IN6_LH;

typedef struct in6_addr {
    union {
        UCHAR       Byte[16];
        USHORT      Word[8];
    } u;
} IN6_ADDR, *PIN6_ADDR, FAR *LPIN6_ADDR;
   
    */

/* THIS IS IPv4 sockadr Struct
    ; Prepare for connection:
    SizeOfSocketAddress = 16
    VarSetCapacity(SocketAddress, SizeOfSocketAddress)
    InsertInteger(2, SocketAddress, 0, AF_INET)   ; sin_family
    InsertInteger(DllCall("Ws2_32\htons", "UShort", Port), SocketAddress, 2, 2)   ; sin_port
    InsertInteger(DllCall("Ws2_32\inet_addr", "Str", IPAddress), SocketAddress, 4, 4)   ; sin_addr.s_addr
*/
    ; Attempt connection:
    if DllCall("Ws2_32\connect", "UInt", socket, "UInt", &SocketAddress, "Int", SizeOfSocketAddress)
    {
        MsgBox % "connect() indicated Winsock error " . DllCall("Ws2_32\WSAGetLastError") . "?"
        return -1
    }
    return socket  ; Indicate success by returning a valid socket ID rather than -1.
}