如何将 SOCKET (HANDLE) 从非托管 C 程序传递到 .NET 子进程？

Question

我们有一个用 C 编写的 Windows 服务 (WS)。WS 在端口上侦听传入请求。其中一个请求是启动子进程并将 SOCKET 传递给它，以便请求应用程序服务器 (RAS) 之后继续与子进程对话。子进程可执行文件 (CPE) 也是用 C 编写的。

这是 WS 的（简化）代码：

... 
HANDLE curr_channel // is the SOCKET our WS got from accepting an incoming connection attempt
HANDLE process_h = GetCurrentProcess();
HANDLE new_channel;
DuplicateHandle(process_h, curr_channel, process_h, &new_channel, 0, TRUE, DUPLICATE_SAME_ACCESS); // note that bInheritHandles is set to TRUE (1)
char command_line[2048];
sprintf(command_line, "<path to executable to be started as child process> %Iu", (unsigned __int64)new_channel);
PROCESS_INFORMATION process_info;
memset(&process_info, 0, sizeof(PROCESS_INFORMATION));
STARTUPINFO startup;
memset(&startup, 0, sizeof(STARTUPINFO));
startup.cb = sizeof(STARTUPINFO);
CreateProcess(NULL, command_line, NULL, NULL, TRUE, 0, NULL, NULL, &startup, &process_info); // note that bInheritHandles is set to TRUE (1)
CloseHandle(process_info.hThread);
CloseHandle(process_info.hProcess);
CloseHandle(new_channel);
...

这是 CPE 的（简化）代码：

...
int pipeFd = atoi(argv[1]);
char *outBuf = ... // the message to be sent to the RAS as this is waiting for a (synchronous) response
int size = ... // length of this message
int cnt = send(pipeFd, outBuf, size, 0);
...

多年来，这一切都非常有效。现在我们想用一个用C#编写的程序来代替CPE，我们称之为CPE.NET。 WS 应该保持原样（用 C 编写）。

这是 CPE.NET 的（简化）代码：

class Program {

    [DllImport("ws2_32.dll")]
    extern static int send([In] IntPtr socketHandle, [In] IntPtr buffer, [In] int count, [In] SocketFlags socketFlags);

    public static int Send(IntPtr socketHandle, byte[] buffer, int offset, int size, SocketFlags socketFlags) {
        unsafe {
            fixed (byte* pData = buffer) {
                return send(socketHandle, new IntPtr(pData + offset), size, socketFlags);
            }
        }
    }

    static void Main(string[] args) {
        int socketHandle;
        if (!int.TryParse(args[1], out socketHandle))
            return;
        byte[] data = new byte[] { ... }; // the message to be sent to the RAS as this is waiting for a (synchronous) response
        int retSendWithDotNet = Send(new IntPtr(socketHandle), data, 0, data.Length, 0);
        ...

现在的问题是 retSendWithDotNet 总是 -1。知道为什么会这样吗？

谢谢，迈克尔

Answer 1

"You need to call WSAGetLastError to get more information. My guess is that sockets are not initialized (see WSAStartup)."

简单但有效。调用 WSAStartup() 就成功了。非常感谢。

如何将 SOCKET (HANDLE) 从非托管 C 程序传递到 .NET 子进程？

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