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我使用 TCP 客户端成功连接到 onlinenic API，但在尝试登录时遇到错误。

下面是我的代码（用户名和密码是由 onlinenic 提供的演示）

    Imports System
    Imports System.Net.Sockets
    Imports System.Text
Imports System.Security.Cryptography
Imports System.IO
Imports System.Text.RegularExpressions
Imports System.Configuration
Imports System.Xml.Linq
Imports System.Xml

Partial Public Class _Default
    Inherits System.Web.UI.Page
    Private client As New TcpClient()
    Private stream As NetworkStream
    Private PortNo As Integer = 30009
    Private testIP As String = "218.5.81.149"
    Private testID As String = "135610"
    Private testPassword As String = "654123"
    Private Function Connect() As Boolean
        client.Connect(testIP, PortNo)
        stream = client.GetStream()
        Dim responseData As String = ""
        Dim data As [Byte]() = New [Byte](255) {}
        Dim bytes As Int32 = stream.Read(data, 0, data.Length)
        responseData = Encoding.ASCII.GetString(data, 0, bytes)
        Return responseData.Contains("Your Connection with API Server is Successful")
    End Function




    Private Function Login() As Boolean
        Dim HashedPass As String = CreateMd5Hash(testPassword)
        Dim guid__1 As Guid = Guid.NewGuid()
        Dim chksum As String = CreateMd5Hash(testID + HashedPass + guid__1.ToString() + "login")
        Dim sb As New StringBuilder()
        sb.Append("<?xml version=""1.0"" encoding=""UTF-8"" standalone=""no""?>")
        sb.Append("<request>")
        sb.Append("<category>client</category>")
        sb.Append("<action>Login</action>")
        sb.Append("<params>")
        sb.Append("<param name=""clid"">" + testID + "</param>")
        sb.Append("</params>")
        sb.Append("<cltrid>" + guid__1.ToString() + "</cltrid>")
        sb.Append("<chksum>" + chksum + "</chksum>")
        sb.Append("</request>")
        Dim responseData As [String] = [String].Empty
        Dim data As [Byte]()
        data = System.Text.Encoding.ASCII.GetBytes(sb.ToString())
        stream.Write(data, 0, data.Length)
        Dim bytes As Int32 = stream.Read(data, 0, data.Length)
        responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)
        bytes = stream.Read(data, 0, data.Length)
        responseData += System.Text.Encoding.ASCII.GetString(data, 0, bytes)
        Return responseData.Contains("Command completed successfully")
    End Function

当我尝试使用上述 login() 函数进行连接时，出现以下错误：

你调用的对象是空的。

Line 49:         Dim data As [Byte]()
Line 50:         data = System.Text.Encoding.ASCII.GetBytes(sb.ToString())
Line 51:         stream.Write(data, 0, data.Length)
Line 52:         Dim bytes As Int32 = stream.Read(data, 0, data.Length)
Line 53:         responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)

错误消息出现在这一行：stream.Write(data, 0, data.Length)

System.NullReferenceException 未被用户代码处理
Message=Object 引用未设置为对象的实例。
Source=App_Web_4023pkvf StackTrace：在 D:\Documents and Settings\sa\My Documents\Visual Studio 2010\WebSites\onlinenic_vb1\Default.aspx.vb 中的 _Default.Login() 处：_Default.Button2_Click 的第 51 行（对象发件人，EventArgs e ) 在 D:\Documents and Settings\sa\My Documents\Visual Studio 2010\WebSites\onlinenic_vb1\Default.aspx.vb:line 243 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web .UI.WebControls.Button.RaisePostBackEvent(String eventArgument) 在 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) 在 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) 在 System.Web.UI.Page 的字符串 eventArgument)。ProcessRequestMain（布尔型 includeStagesBeforeAsyncPoint，布尔型 includeStagesAfterAsyncPoint）
内部异常：

4

1 回答 1

0

你应该试试这个：

 Dim HashedPass As String = CreateMd5Hash(testPassword)
        Dim guid__1 As Guid = Guid.NewGuid()
        Dim chksum As String = CreateMd5Hash(testID + HashedPass + guid__1.ToString() + "login")
        Dim sb As New StringBuilder()
        sb.Append("<?xml version=""1.0"" encoding=""UTF-8"" standalone=""no""?>")
        sb.Append("<request>")
        sb.Append("<category>client</category>")
        sb.Append("<action>Login</action>")
        sb.Append("<params>")
        sb.Append("<param name=""clid"">" + testID + "</param>")
        sb.Append("</params>")
        sb.Append("<cltrid>" + guid__1.ToString() + "</cltrid>")
        sb.Append("<chksum>" + chksum + "</chksum>")
        sb.Append("</request>")
        Dim responseData As [String] = [String].Empty
        Dim data As [Byte]()
        data = System.Text.Encoding.ASCII.GetBytes(sb.ToString())
        stream.Write(data, 0, data.Length)
        Dim bytes As Int32 = stream.Read(data, 0, data.Length)
        responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)
        bytes = stream.Read(data, 0, data.Length)
        responseData += System.Text.Encoding.ASCII.GetString(data, 0, bytes)
        Return responseData.Contains("Command completed successfully")
于 2013-01-28T12:16:44.350 回答