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50 lines
2.2 KiB
Text
50 lines
2.2 KiB
Text
{{DISPLAYTITLE:_OPENCONNECTION}}
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The [[_OPENCONNECTION]] function opens a connection from a client that the host has detected and returns a status handle.
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{{PageSyntax}}
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:{{Parameter|connectHandle}} = [[_OPENCONNECTION]]({{Parameter|hostHandle}})
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{{PageDescription}}
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* Valid {{Parameter|connectHandle}} values returned are negative numbers.
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* If the syntax is correct but they fail to begin/connect, a {{Parameter|connectHandle}} of 0 is returned.
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* Always check if the handle returned is 0 (failed) before continuing.
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* [[CLOSE]] #{{Parameter|connectHandle}} closes the connection. Failed connections({{Parameter|connectHandle}} = 0) do not need to be closed.
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* As a '''Host''' you can check for new clients (users). Each will have a unique connection handle.
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* Creates an [[ERROR Codes|Illegal Function Call]] error if called with a string argument of the wrong syntax.
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* Handle values can be used as the open number by [[INPUT (TCP/IP statement)|INPUT #]] or [[GET (TCP/IP statement)|GET #]] read statements and [[PUT (TCP/IP statement)|PUT #]] or [[PRINT (TCP/IP statement)|PRINT #]] write statements.
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{{PageExamples}}
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''Example:'' Using the [[_OPENCONNECTION]] new client return with [[INPUT (TCP/IP statement)|INPUT]] # or [[GET (TCP/IP statement)|GET]] # message or data reads.
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{{CodeStart}}
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host = {{Cl|_OPENHOST}}("TCP/IP:8080")
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{{Cl|DO}}
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newclient = {{Cl|_OPENCONNECTION}}(host) ' monitor host connection
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{{Cl|IF...THEN|IF}} newclient {{Cl|THEN}}
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{{Cl|SLEEP}} 1 ' wait one second for data to arrive
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{{Cl|INPUT (TCP/IP statement)|INPUT}} #newclient, a
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{{Cl|PRINT}} a
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{{Cl|CLOSE}} #newclient ' close after each read
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{{Cl|ELSE}} : {{Cl|_DELAY}} .05 ' share resources with other programs (20 loops per second)
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{{Cl|END IF}}
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} <> "" ' any keypress quits
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{{Cl|CLOSE}} #host
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{{Cl|SYSTEM}}
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{{CodeEnd}}
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''Explanation:'' The function finds new clients and waits one second to read a message or other data. If a message or data was sent, it displays it on the screen and closes the connection.
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'''Note: When sending data, the client should wait about 3 seconds before closing their connection!'''
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{{PageSeeAlso}}
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* [[_OPENHOST]], [[_OPENCLIENT]]
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* [[_CONNECTED]], [[_CONNECTIONADDRESS]]
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{{PageNavigation}}
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