C# Signature:

// For 32-bit execution
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct WSAData
{
    public Int16 version;
    public Int16 highVersion;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
    public String description;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
    public String systemStatus;

    public Int16 maxSockets;
    public Int16 maxUdpDg;
    public IntPtr vendorInfo;
}

// For 64-bit execution
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
internal struct WSAData64
{
    internal ushort wVersion;
    internal ushort wHighVersion;
    internal ushort iMaxSockets;
    internal ushort iMaxUdpDg;
    internal IntPtr lpVendorInfo;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
    internal string szDescription;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
    internal string szSystemStatus;
}

VB Signature:

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

User-Defined Types:

None.

Notes:

Used in calling WSAStartup.

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Sample Code:

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