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8.2

problems in data over socket

Asked by jaxrpc in Microsoft Visual Basic.Net, .NET, Microsoft Visual C#.Net

Tags: Socket, Vb.net, byte array, structure

Hi,

I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.

I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part. Thanks in advance.

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             'Structures
Public Structure MESSAGETYPE_OIP_Login
        Dim Header() As COMMANDHEADER
        Dim UserName() As PSTRING
        Dim Password() As PSTRING
    End Structure
   
    Public Structure COMMANDHEADER
        Dim MessageType As UInt32
        Dim Length As UInt32
        Dim Reserved1 As UInt32
        Dim Reserved2 As UInt32
    End Structure
 
    Public Structure PSTRING
        Dim Length As UInt32
        Dim CharArray() As Char
    End Structure
 
'Conversion and sending part
Dim client as System.Net.Sockets.TcpClient = New  System.Net.Sockets.TcpClient("192.168.20.93", 9401)
 
Dim networkStream As Net.Sockets.NetworkStream = client.GetStream()
 
        Dim Login As MESSAGETYPE_OIP_Login
 
        Login.Header.MessageType = 4485122
        Login.Header.Reserved1 = 0
        Login.Header.Reserved2 = 0
        Login.Header.Length = Marshal.SizeOf(Login.Header)
 
        Login.UserName.CharArray = "admin".ToCharArray
        Login.UserName.Length = Login.UserName.CharArray.Length
 
        Login.Password.CharArray = "admin".ToCharArray
        Login.Password.Length = Login.Password.CharArray.Length
 
        Dim StrtoBy() As Byte
 
 
        Dim ptr As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(Login))
        
        ReDim StrtoBy(Marshal.SizeOf(Login) - 1)
        Marshal.Copy(ptr, StrtoBy, 0, Marshal.SizeOf(Login))
        Marshal.FreeCoTaskMem(ptr)
 
        networkStream.Write(StrtoBy, 0, StrtoBy.Length)

           
         

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problems in data over socket

Asked by jaxrpc in Microsoft Visual Basic.Net, .NET, Microsoft Visual C#.Net

Tags: Socket, Vb.net, byte array, structure

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