[.NET] 關於Socket傳送與接收問題
小弟最進剛接觸Socket,但是碰上了一點問題..
最近在寫一隻程式,其目地是要把連在NPort的測量機器的值讀回到電腦中..
我是使用Socket傳送一到指令經由Nport送到測量器端,測量器收到指令後會把值回傳到
NPort,在傳送到電腦中,如果傳送的指令都正確的話,NPort都會把值回傳到電腦中..
可是問題來了,如果傳送的指令測量器無法辨示而無回傳值,接下來不論我傳什麼指令,
就算是正確的指令,NPort都沒有收到我傳送的指令,除非我把Socket斷線後重新New一個
Socket才有辦法,這到底是什麼原因呢??當我直接始用RS232連測量器時,就算有錯誤的指令
只要後來有輸入正確的指令,測量器都會回傳值回來,我在想是NPort的問題還是Socket的
問題...懇請大家指導...
程式碼如下:
Private RemoteIP As String = "192.XXX.XXX.XX"
Private RemotePort As Integer = 4002
Private Server As New Socket(AddressFamily.InterNetwork, SocketType.Stream, _
ProtocolType.Tcp)
Dim ServerIPAdress As IPAddress = IPAddress.Parse(RemoteIP)
Dim ServerPort As NEW IPEndPoint(t(ServerIPAdress, RemotePort)
Dim ReceiveData(100) As Byte
Dim Receivestring As String = ""
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click
Dim f As Byte() = System.Text.Encoding.ASCII.GetByte ("$C,DR,3*64") '傳送的指令
Server.Send(f)
System.Threading.Thread.Sleep(1000)
If Server.Available Then
Server.Receive(ReceiveData)
Receivestring = Encoding.ASCII.GetString(ReceiveData)
MsgBox(Receivestring)
End If
End Sub
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