VB.NET套接字发送和接收

我试图ping消息到服务器，并得到一个消息与服务器上的总球员的数字值。不幸的是，下面的代码会冻结，除非我删除下面的一段代码。VB.NET套接字发送和接收

Public Shared Function SocketSendReceive(server As String, port As Integer) As String 
    'Set up variables and String to write to the server. 
    Dim ascii As Encoding = Encoding.ASCII 
    Dim request As String = (DoubleChar(Len(Chr(35))) + Chr(CheckSum(Chr(35)) * 20 Mod 194) + Chr(0) + Chr(35)) 
    Dim bytesSent As [Byte]() = ascii.GetBytes(request) 
    Dim bytesReceived(255) As [Byte] 

    ' Create a socket connection with the specified server and port. 
    Dim s As Socket = ConnectSocket(server, port) 

    If s Is Nothing Then 
     Return "0" 
    End If 
    ' Send request to the server. 
    s.Send(bytesSent, bytesSent.Length, 0) 

    ' Receive the server home page content. 
    Dim bytes As Int32 

    ' Read the first 256 bytes. 
    Dim page As [String] = "0" 

    ' The following will block until the page is transmitted. 
    Do 
     bytes = s.Receive(bytesReceived, bytesReceived.Length, 0) 
     page = page + Encoding.ASCII.GetString(bytesReceived, 0, bytes) 
    Loop While bytes > 0 
    Return page 
End Function

当我删除了这部分代码：

Do 
     bytes = s.Receive(bytesReceived, bytesReceived.Length, 0) 
     page = page + Encoding.ASCII.GetString(bytesReceived, 0, bytes) 
    Loop While bytes > 0

的平经过，但没有返回值。有人能指出我做错了什么吗？

来源

2012-12-12 Moulijin

为什么'[Byte]'和'[String]'？他们工作正常，没有括号... – Ryan

如果你的数据恰好是256字节的倍数，那么它会阻塞并永远不会返回。代替尝试使用'Loop While s.Available> 0'。 – Ryan

结果仍然相同 – Moulijin

你的循环让它崩溃，我有类似的问题。你要做的是让你的服务器多线程。你在这里做的是无限循环遍历代码，这会导致当前线程冻结。如果你添加另一个线程，它将起作用。 Google（mutlithreaded socket programming）

来源

2013-11-25 16:56:19 wietze

VB.NET套接字发送和接收

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