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52 lines
2.1 KiB
Plaintext
52 lines
2.1 KiB
Plaintext
'''GET''' reads unformatted (raw) data from an open TCP/IP connection opened with [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]].
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{{PageSyntax}}
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''Syntax 1:''
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: '''GET''' ''#handle'', , ''b$''
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* Reads any available data into variable length string b$ (b$'s length is adjusted to the number of bytes read, so checking EOF is unnecessary) using the handle return value from [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]].
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''Syntax 2:''
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: '''GET''' ''#handle'', ,''x%''
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* Reads an integer. If 2 bytes are available, they are read into x%, if not then nothing is read and [[EOF]](handle) will return -1 (and ''x%'''s value will be undefined) using the handle return value from [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]].
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==Communicating using unformatted/raw streamed data==
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* Benefit: Communicate with any TCP/IP compatible protocol (eg. FTP, HTTP, web-pages, etc).
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* Disadvantage: Streamed data has no 'message length', as such just the program deals with a continuous number of bytes in a row. Some messages get fragmented and parts of messages can (and often do) arrive at different times, due to the very nature of the TCP/IP protocol.
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* The position parameter (between the commas) is not used in TCP/IP connections.
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* The programmer must cater for these situations manually.
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{{PageExamples}}
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''Example:''
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{{CodeStart}}
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{{Cl|PUT|PUT #}}c, , a$ ' sends data
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{{Cl|GET|GET #}}o, , b$ ' reads any available data into variable length string b$
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{{Cl|GET|GET #}}o, , x% ' if 2 bytes are available, they are read into x%
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{{CodeEnd}}
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''Explanation:''
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* Data could be a string, variable array, user defined [[TYPE]], etc.
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* b$'s length is adjusted to the number of bytes read. Checking [[EOF]](o) is unnecessary.
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* If 2 bytes are not available for the x% integer then nothing is read and [[EOF]](o) will return -1
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===More examples===
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* ''See the examples in [[_OPENCLIENT]] or [[Email Demo]].''
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{{PageSeeAlso}}
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* [[PUT (TCP/IP statement)]]
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* [[_OPENCLIENT]], [[_OPENHOST]]
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* [[_OPENCONNECTION]], [[GET|GET #]]
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* [https://curl.haxx.se/ cURL] (HTTP and FTP file transfer)
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{{PageNavigation}}
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