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48 lines
2 KiB
Plaintext
48 lines
2 KiB
Plaintext
GET (in regard to TCP/IP) reads unformatted(raw) data from an open connection, opened with [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]] '''QB64''' functions.
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{{PageSyntax}}
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::::::::''Syntax 1:'' GET #handle, ,b$
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*Reads any available data into variable length string b$ (b$'s length is adjusted to the number of bytes read, so checking EOF is completely unnecessary) using the handle return value from the function used.
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::::::::''Syntax 2:'' GET #handle, ,x%
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*Reads an integer, if 2 bytes are available, they are read into x%, if not then nothing is read and EOF(handle) will return -1 (and x%'s value will be undefined) using the handle return value from the function used.
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:::::'''Communicating using unformatted/raw streamed data:'''
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* Benefit: Communicate with any TCP/IP compatible protocol (eg. FTP, HTTP, web-pages, etc)
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* Disadvantage: Streamed data has no 'message length' as such, just a continuous bunch of bytes all in a row. Some messages get fragmented and parts of messages can (and often do) arrive at different times.
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* The position parameter(between the commas) is not used in TCP/IP statements.
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:::::'''Your program MUST cater for these situations manually.'''
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''Example:''
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{{CodeStart}}
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{{Cl|PUT|PUT #}}c, , a$ ' 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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''See the examples in [[_OPENCLIENT]] or [[Email Demo]].''
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''See also:''
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* [[PUT (TCP/IP statement)]], [[INPUT (TCP/IP statement)]]
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* [[_OPENCLIENT]], [[_OPENHOST]]
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* [[_OPENCONNECTION]], [[GET|GET #]]
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* [[IP Configuration]], [[WGET]] (HTTP and FTP file transfer)
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{{PageNavigation}} |