Classic ASP

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method. Classic ASP

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<%
success = 0

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

set sock = Server.CreateObject("Chilkat.Socket")

'  --------------------------------------------------------------------
'  This example uses the public TCP echo service at https://tcpbin.com/
'  --------------------------------------------------------------------

useTls = 0
port = 4242
maxWaitMs = 5000
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( sock.LastErrorText) & "</pre>"
    Response.End
End If

'  Wait a max of 2 seconds for a response..
sock.MaxReadIdleMs = 2000

'  Send some strings, each terminated by a 0 byte.
success = sock.SendString("This is the 1st string")
success = sock.SendByte(0)
success = sock.SendString("This is string number 2")
success = sock.SendByte(0)

'  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
success = sock.SendByte(10)

'  Now let's receive what is echoed back....
'  Receive each string and the NULL byte.
'  The call to ReceiveStringUntilByte will receive incoming data until the lookForByte is encountered.
'  The lookForByte is receive and discarded (it is not returned in the string)
lookForByte = 0
s1 = sock.ReceiveStringUntilByte(lookForByte)
If (sock.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( sock.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( s1) & "</pre>"

s2 = sock.ReceiveStringUntilByte(lookForByte)
If (sock.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( sock.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( s2) & "</pre>"

'  The echo server will also echo back the final LF
success = sock.ReceiveByte(1)
maxWaitMs = 100
success = sock.Close(100)

'  Output:
'  This is the 1st string
'  This is string number 2

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