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opens a textstream with default or given options.
open(+SourceSink, +IoMode, -Stream)
open(+SourceSink, +IoMode, -Stream, +Options)
open/3 opens a source or sink for input or output depending on the I/O-Mode, with default options. open/4 opens a source or sink for input or output, depending on the I/O-Mode, with the given options.
IoMode can have the following values:
| read | stream is opened for reading. |
| write | stream is opened for writing. If the opened object (maybe a file) is already existing, its content will be overwritten. |
Options must be a list of options, where the options are elements of the following atoms:
| file | open a file. For applets the file will be opened relative to the path of the html-file, with declares the applet-definition. |
| url | opens an object, which url-address is given by the first argument of open/4. |
| socket | retrieves the inputstream/outputstream of an opened socket. The socket must be passed as first argument of open/4. |
| atom | opens an character input stream, where the content of the stream is given by the characters given by the first argument (must be an atom). |
| text | opens a text stream |
| binary | opens a binary stream |
| buffered | the opened stream will be buffered |
| unbuffered | the opened stream will not be buffered |
| encoding(Encoding) | the stream will be opened with the specific Encoding. This will overwrite the command line argument "-encoding Encoding". |
| syntax(StrictOrClassic) | the text stream will be opened with or without the Java
international character set mapping. This is relevant when reading
Prolog terms.
This will overwrite the command line argument "-syntax strict|classic". |
| type(term) | the stream will be opened as a binary term stream. |
Arguments
SourceSink Source or sink IoMode read, write or append Stream non atomic ground term Options list of options
Examples
?- open('hello(world).', read, S, [atom]), read(S, T), close(S).
S = '__com.ifcomputer.minerva.MinervaTokenizer_679'
T = hello(world)
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open(File,read,In,[encoding('EUCJIS')])
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Standard
These predicates are part of the ISO-Prolog Standard. The option list is not compatible with the ISO-Prolog Standard.
See also
at_end_of_stream/0/1, close/1/2, current_error/1, current_input/1, current_output/1, flush_output/0/1, set_error/1, set_input/1, set_output/1.
| document: http://www.ifcomputer.co.jp/MINERVA/Manual/Reference/Predicates/stream_selection/open/print_en.html published 2008/10/13 update 2002/3/18 (c) 1996-2006 IF Computer Japan | ||||||||
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