Imports System.IO Imports System.Net Imports System.Net.Sockets …… Private Function Connect(ByVal strServer As String, ByVal strUser As String, ByVal strPwd As String) As NetworkStream Dim Sender As New TcpClient(strServer, 110) Dim OutBytes As Byte() Dim input As String Dim Ns As NetworkStream = Nothing Try Ns = Sender.GetStream() Dim sr As New StreamReader(Ns) input = "user " & strUser & vbCrLf outbytes = System.Text.Encoding.ASCII.GetBytes(input) Ns.Write(OutBytes, 0, OutBytes.Length) Console.WriteLine(sr.ReadLine()) input = "pass " & strPwd & vbCrLf OutBytes = System.Text.Encoding.ASCII.GetBytes(input) Ns.Write(OutBytes, 0, OutBytes.Length) Console.WriteLine(sr.ReadLine()) Console.WriteLine("==========================================================") Return Ns Catch ex As Exception MsgBox("无法连接到服务器", MsgBoxStyle.Critical) Return Ns End Try End Function Private Function GetNumberOfNewMessages() As Integer Dim OutBytes As Byte() Dim input As String Dim strTemp As String GetNumberOfNewMessages = -1 Try Dim Ns As NetworkStream = Connect("在这输入邮件服务器名称", "用户名", "密码") If (Ns Is Nothing) Then Exit Function Dim sr As New StreamReader(Ns) input = "stat" & vbCrLf OutBytes = System.Text.Encoding.ASCII.GetBytes(input) Ns.Write(OutBytes, 0, OutBytes.Length) Dim resp As String = sr.ReadLine() Console.WriteLine(resp) Dim tokens As String() = resp.Split(" ") input = "quit" & vbCrLf OutBytes = System.Text.Encoding.ASCII.GetBytes(input) Ns.Write(OutBytes, 0, OutBytes.Length) Console.WriteLine(sr.ReadLine()) sr.Close() Ns.Close() Return Val(tokens(1)) Catch ex As Exception Console.WriteLine(ex.ToString) End Try End Function Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click dim intNew as Integer intNew=GetNumberOfNewMessages() msgbox "有" & cstr(intNew) & "封新邮件！" End Sub
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