CAsyncSocket 10093错误

Question

我从CAsyncSocket继承，实现我自己的类。首先，它开始像：

MyClient::MyClient()//this is the constructor, I will create the socket in this constructor 
{
   if (!Create(0, SOCK_DGRAM, FD_READ | FD_WRITE))
  {
     UINT errCode = GetLastError();
     printf("Create Client socket failed! Errorcode is %d\n", errCode);
  }
}

但它会显示Create Client socket failed! Errorcode is 10093。

我在线搜索，显示10093是因为：

  

尚未执行成功的WSAStartup。

     

应用程序未调用WSAStartup或WSAStartup失败。应用程序可能正在访问当前活动任务不拥有的套接字（即尝试在任务之间共享套接字），或者WSACleanup已被调用太多次。

然后我将代码修改为

MyClient::MyClient()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

/* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
wVersionRequested = MAKEWORD(2, 2);

err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
    /* Tell the user that we could not find a usable */
    /* Winsock DLL.                                  */
    printf("WSAStartup failed with error: %d\n", err);

}

/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater    */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we      */
/* requested.                                        */

if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
    /* Tell the user that we could not find a usable */
    /* WinSock DLL.                                  */
    printf("Could not find a usable version of Winsock.dll\n");
    WSACleanup();

}
else
    printf("The Winsock 2.2 dll was found okay\n");


/* The Winsock DLL is acceptable. Proceed to use it. */

/* Add network programming using Winsock here */

/* then call WSACleanup when done using the Winsock dll */


if (!Create(0, SOCK_DGRAM, FD_READ | FD_WRITE))
{
    UINT errCode = GetLastError();
    printf("Create Client socket failed! Errorcode is %d\n", errCode);
}
WSACleanup();
}

然后运行它，显示：

我也尝试添加

if (!AfxSocketInit()) 
{ 
AfxMessageBox(IDP_SOCKETS_INIT_FAILED); 
return FALSE; 
}

但它仍然有同样的错误。