GET

From QB64 Wiki
Revision as of 22:23, 9 May 2011 by imported>Clippy
Jump to navigation Jump to search

The GET # file or port device statement reads data by bytes or record positions.


Syntax

GET #filenumber%, [position], read_variable


  • File/port number is the number used in the OPEN AS statement.
  • The INTEGER or LONG byte or record position is the byte in a BINARY file or the record in a RANDOM file.
  • The position can be omitted if the GETs are consecutive or when creating a new file.
  • The variable value is any string or number type or a TYPE or FIELD variable.
  • QB64 can GET the entire data contents of an array from a PUT array file.
  • GET can ignore the EOF statement and return bad data when transferring data to another file! Always check for EOF after a GET to see if it should be PUT.
  • GET does NOT require a record position or read variable when using a FIELD statement!


Example 1: Checking for End of File before transferring individual GET data.

DO UNTIL EOF(1) GET #1, , value% IF NOT(EOF(1)) THEN PUT #2, , value% LOOP


Example 2: Using a TYPE record variable to read a TYPE record(Contact).

OPEN file$ FOR RANDOM as #1 LEN = LEN(Contact) IF record% <= LOF(1) \ LEN(Contact) THEN GET #1, record%, Contact CLOSE #1

Note: The Contact record contains all of the DOT variable types listed in the TYPE.


Example 3: Restoring array data from a BINARY file using GET # in QB64 only.

DIM myarray(80000) AS INTEGER OPEN "myfile.ext" FOR BINARY AS #1 GET #1, , myarray() CLOSE #1

Note: The file data must have been previously stored in the file using PUT # the same way!


See also:



Navigation:
Keyword Reference - Alphabetical
Keyword Reference - By Usage
Main Wiki Page