SWI-Prolog -- peek_string/3

Did you know ...

Search Documentation:

Predicate peek_string/3

HOME
DOWNLOAD
DOCUMENTATION
- Manual
- Packages
- FAQ
- Command line
- PlDoc
- Bluffers▶
- License
- Publications
- Rev 7 Extensions
TUTORIALS
- Beginner▶
- Advanced▶
- Web applications▶
- Semantic web▶
  - ClioPatria
  - RDF namespaces
- Graphics▶
  - XPCE
  - GUI options
- Machine learning▶
  - Probabilistic Logic Programming
- External collections▶
  - Meta level tutorials
- For packagers▶
  - Linux packages
COMMUNITY
COMMERCIAL
WIKI
- Login
- View changes
- Sandbox
- Wiki help
- All tags

Availability:built-in

peek_string(+Stream, +Len, -String)

Read the next Len characters (if the stream is a text stream) or bytes (if the stream is binary) from Stream without removing the data. If Len is larger that the stream buffer size, the buffer size is increased to Len. String can be shorter than Len if the stream contains less data. This predicate is intended to guess the content type of data read from non-repositionable streams.