C++: gethostname() 失败

Question

我需要获取我正在使用的系统主机名 gethostname功能

但是它失败了，错误代码是 10093

WSANOTINITIALISED 10093

Successful WSAStartup not yet performed. Either the application has not called WSAStartup or WSAStartup failed. The application may be accessing a socket that the current active task does not own (that is, trying to share a socket between tasks), or WSACleanup has been called too many times.

下面是我的程序代码:

#include <Winsock2.h>
#include <ws2tcpip.h>
#include <Windows.h>    
#pragma comment(lib, "Ws2_32.lib")

int main()
{    
   char hostname[1024];
   hostname[1023] = '\0';
   gethostname(hostname, 1023);
   int err = WSAGetLastError();    
}

什么可能导致此失败？

---

编辑

在 gethostname 函数调用之前添加以下代码解决了问题。

if (WSAStartup (MAKEWORD(2,2), &WSAData) != 0) 
{
  MessageBox (NULL, TEXT("WSAStartup failed!"), TEXT("Error"), MB_OK);
  return FALSE;
}

Answer 1

它写在您发布的链接中:

A successful WSAStartup call must occur before using this function.

调用WSAStartup，检查其返回码，如果一切正常，调用gethostname。