"Either the application has not called WSAStartup, or WSAStartup failed"是什么意思？

Question

我正在尝试开发通过网络连接到Web服务器的软件;在尝试使用加密狗来保护我的软件之前，一切正常。我的加密狗有一些网络功能，它是网络基础设施下的 API 工作。w当我将加密狗检查代码添加到我的程序中时，出现此错误：

"Either the application has not called WSAStartup, or WSAStartup failed"  

我放置了引发异常的代码块。我得到例外的情况是;我登录了程序（一切正常），然后拔出加密狗，然后程序停止并要求加密狗，我再次插入加密狗并尝试登录，但我在线遇到异常

响应 = （HttpWebResponse）请求。获取响应（）;

DongleService unikey = new DongleService();
                checkDongle = unikey.isConnectedNow();
                if (checkDongle)
                {
                    isPass = true;
                    this.username = txtbxUser.Text;
                    this.pass = txtbxPass.Text;
                    this.IP = combobxServer.Text;
                    string uri = @"https://" + combobxServer.Text + ":5002num_events=1";
                    request = (HttpWebRequest)WebRequest.Create(uri);
                    request.Proxy = null;
                    request.Credentials = new NetworkCredential(this.username, this.pass);
                    ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);
                    response = (HttpWebResponse)request.GetResponse();
                    Properties.Settings.Default.User = txtbxUser.Text;
                    int index = _servers.FindIndex(p => p == combobxServer.Text);
                    if (index == -1)
                    {
                        _servers.Add(combobxServer.Text);
                        Config_Save.SaveServers(_servers);
                        _servers = Config_Save.LoadServers();
                    }
                    Properties.Settings.Default.Server = combobxServer.Text;
                    // also save the password
                    if (checkBox1.CheckState.ToString() == "Checked")
                        Properties.Settings.Default.Pass = txtbxPass.Text;
                    Properties.Settings.Default.settingLoginUsername = this.username;
                    Properties.Settings.Default.settingLoginPassword = this.pass;
                    Properties.Settings.Default.settingLoginPort = "5002";
                    Properties.Settings.Default.settingLoginIP = this.IP;
                    Properties.Settings.Default.isLogin = "guest";
                    Properties.Settings.Default.Save();
                    response.Close();
                    request.Abort();
                    this.isPass = true;
                    this.Close();
                }
                else
                {
                    MessageBox.Show("Please Insert Correct Dongle!", "Dongle Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                }

Answer 1

WSAStartup是套接字库中的第一个函数，在开始使用net时执行。您可以导入

 [DllImport("ws2_32.dll", CharSet = CharSet.Auto, SetLastError=true)]
 static extern Int32 WSAGetLastError();

当引发异常时，执行WSAGetLastError并从此处查看错误代码。希望对您有所帮助。在获得 Win32Exception 的特定情况下，您可以使用 NativeErrorCode from exception 中，如@Patrick注释中所述。