_OPENCLIENT

The _OPENCLIENT function connects to a Host on the Internet as a Client and returns the Client status handle.

Before QB64-PE v4.0.0 HTTP functionality was unstable and requires $UNSTABLE:HTTP to be able to use it.

Syntax

clientHandle& = _OPENCLIENT("TCP/IP:8080:12:30:1:10")

clientHandle& = _OPENCLIENT("HTTP:url")

Description

• An Illegal Function Call error will be triggered if the function is called with a string argument of the wrong syntax.
• Connects to a host somewhere on the internet as a client.
• Valid clientHandle& values are negative. 0 means that the connection failed. Always check that the handle returned is not 0.
• CLOSE clientHandle& closes the client. A failed handle of value 0 does not need to be closed.

Examples

Example 1

Attempting to connect to a local host(your host) as a client. A zero return indicates failure.

client = _OPENCLIENT("TCP/IP:7319:localhost") IF client THEN PRINT "[Connected to " + _CONNECTIONADDRESS(client) + "]" ELSE PRINT "[Connection Failed!]" END IF

NOTE: Try a valid TCP/IP port setting to test this routine!

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Example 2

Using HTTP to download from a URL.

' Content of the HTTP response is returned. The statusCode is also assigned. FUNCTION Download$(url AS STRING, statusCode AS LONG) h& = _OPENCLIENT("HTTP:" + url) statusCode = _STATUSCODE(h&) WHILE NOT EOF(h&) _LIMIT 60 GET #h&, , s$ content$ = content$ + s$ WEND CLOSE #h& Download$ = content$ END FUNCTION

See also

• _OPENHOST, _OPENCONNECTION
• _CONNECTED, _CONNECTIONADDRESS$
• Email Demo, Inter-Program Data Sharing Demo
• Downloading Files

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