PUT (TCP/IP statement): Difference between revisions
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Communicating using unformatted/raw streamed data:
Your program MUST cater for these situations manually.
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{{ | {{PageParameters}} | ||
* The ''handle'' value is returned by the [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]] '''QB64''' functions. | * The ''handle'' value is returned by the [[_OPENCLIENT]], [[_OPENHOST]] or [[_OPENCONNECTION]] '''QB64''' functions. | ||
* The ''data'' can be any variable type value. Literal values are not allowed. | * The ''data'' can be any variable type value. Literal values are not allowed. | ||
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<center>'''Your program MUST cater for these situations manually.'''</center> | <center>'''Your program MUST cater for these situations manually.'''</center> | ||
{{ | {{FixedStart}}''Example: string variable b$'s length is adjusted to the number of bytes read.'' | ||
{{Cb|PUT (TCP/IP statement)|PUT #}}client, , a$ 'sends data (this could be a string, variable array, user defined type, etc) | {{Cb|PUT (TCP/IP statement)|PUT #}}client, , a$ 'sends data (this could be a string, variable array, user defined type, etc) | ||
{{Cb|GET (TCP/IP statement)|GET #}}openconn, , b$ 'reads any available data into variable length string b$ | {{Cb|GET (TCP/IP statement)|GET #}}openconn, , b$ 'reads any available data into variable length string b$ | ||
{{Cb|GET (TCP/IP statement)|GET #}}openconn, , x% 'reads 2 bytes of data as an integer value. | {{Cb|GET (TCP/IP statement)|GET #}}openconn, , x% 'reads 2 bytes of data as an integer value. | ||
{{ | {{FixedEnd}} | ||
: ''Explanation:'' Checking [[EOF]](o) is unnecessary. If 2 bytes are available, they are read into x%, if not then nothing is read and [[EOF]](o) will return -1 | : ''Explanation:'' Checking [[EOF]](o) is unnecessary. If 2 bytes are available, they are read into x%, if not then nothing is read and [[EOF]](o) will return -1 | ||
Revision as of 02:15, 24 January 2023
The PUT # TCP/IP statement sends unformatted(raw) data to an open connection using a user's handle.
Syntax
- PUT #handle, , data
Parameters
- The handle value is returned by the _OPENCLIENT, _OPENHOST or _OPENCONNECTION QB64 functions.
- The data can be any variable type value. Literal values are not allowed.
- Benefit: Communicate with any TCP/IP compatible protocol (eg. FTP, HTTP, web-pages, etc)
- 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.
- The position parameter (between the commas) is not used in TCP/IP statements as all data is streamed consecutively.
Example: string variable b$'s length is adjusted to the number of bytes read. PUT #client, , a$ 'sends data (this could be a string, variable array, user defined type, etc) GET #openconn, , b$ 'reads any available data into variable length string b$ GET #openconn, , x% 'reads 2 bytes of data as an integer value. |
- Explanation: Checking EOF(o) is unnecessary. If 2 bytes are available, they are read into x%, if not then nothing is read and EOF(o) will return -1
See the example in _OPENCLIENT
See also: