C＃ - 转换的IntPtr指向sockaddr结构体为ip地址 [英] C# - Converting IntPtr pointing to sockaddr structure to IPAddress

问题描述

从P /调用本地函数，我得到一个 的IntPtr 它指向的 的sockaddr 结构。我怎样才能将其转换为一个 ip地址 ？

From a P/Invoked native function, I get an IntPtr which points to a sockaddr structure. How can I convert it to an IPAddress?

谢谢！

推荐答案

既然你不能直接元帅 A 的sockaddr 输入到 ip地址的类型，你就必须做出一个管理结构出来的率先将其封进：

Since you can't directly Marshal a sockaddr type into an IPAddress type, you'd have to make a managed struct out of it first to marshal it into:

[StructLayout(LayoutKind.Sequential)]
internal struct sockaddr_in
{
    internal EnumLib.ADDRESS_FAMILIES sin_family;
    internal ushort sin_port;
    internal in_addr sin_addr;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] internal byte[] sin_zero;

    internal static sockaddr_in FromString(string host, int port)
    {
    var sockaddr = new sockaddr_in();
    var lpAddressLength = Marshal.SizeOf(sockaddr);
    WSAStringToAddress(host + ":" + port, EnumLib.ADDRESS_FAMILIES.AF_INET, IntPtr.Zero,
                      ref sockaddr, ref lpAddressLength);
    return sockaddr;
    }
}

然后，您可以使用元帅.PtrToStructure 来获得 SOCKADDR_IN 从类型你的的IntPtr 像这样：

You could then use Marshal.PtrToStructure to obtain a sockaddr_in type from your IntPtr like so:

（SOCKADDR_IN）Marshal.PtrToStructure（地址的typeof（SOCKADDR_IN））;

之后，它应该是相当简单的，创建从你刚刚检索到的数据的新的 ip地址对象。

After that it should be fairly simple to create a new IPAddress object from the data you've just retrieved.

您可以找到包含在 EnumLib 在上面的例子这里的 ADDRESS_FAMILIES 枚举：的 http://pastie.org/8103489

You can find the ADDRESS_FAMILIES enum that is contained in EnumLib in the above example here: http://pastie.org/8103489

有更多原本在pinvoke.net的结构上的成员，只需这里看看如果你有兴趣在其中不过，我想你不会需要他们都在这种特殊情况。

There are originally more members of the struct over at pinvoke.net, just take a look here if you are interested in them but I reckon you won't need them at all in this specific situation.

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