4D Internet Commands v16
TCP_State
TCP_State
| TCP_State ( tcp_ID ; statusCode ) -> Funktionsergebnis | ||||||||
| Parameter | Typ | Beschreibung | ||||||
| tcp_ID | Lange Ganzzahl |
|
Reference to an open TCP | |||||
| statusCode | Ganzzahl |
|
TCP status code | |||||
| Funktionsergebnis | Ganzzahl |
|
Error Code | |||||
The TCP_State command returns an integer value corresponding to the state of a particular TCP connection.
tcp_ID is a long integer reference to an open TCP session as established with either the TCP_Open or TCP_Listen command.
statusCode is an integer variable returned which corresponds to one of the status codes below.
| 0 | Connection Closed |
| 2 | Listening for an incoming connection |
| 8 | Established |
This example assumes that a valid TCP connection has already been established and is identified by the Longint value assigned to the $tcp_id variable. In this example, a command is sent to a Web server requesting a page of information and then a loop is entered to receive the results. Since Web servers automatically close their connections once they have performed their action, this example keeps receiving until the connection is dropped or an error occurs.
C_LONGINT($tcp_id)
C_LONGINT(vState;$err)
C_TEXT($command;$buffer;$response)
If(TCP_Send($tcp_id;$command)=0)
vState:=0
Repeat
$err:=TCP_Receive($tcp_id;$buffer)
$err:=TCP_State($tcp_id;vState)
$response:=$response+$buffer
Until((vState=0)|($err#0))
End if
Produkt: 4D Internet Commands
Thema: IC TCP/IP
Nummer:
88929
Erstellt: 4D Internet Commands 6.5
4D Internet Commands ( 4D Internet Commands v16)
