GET - mkilgore/QB64pe GitHub Wiki

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

GET #fileNumber&, [position][,]

• fileNumber& is the file or port number used in the OPEN AS BINARY or RANDOM statement.
• The INTEGER or LONG byte position in a BINARY file or the record position in a RANDOM file must be greater than zero.
• The position can be omitted if the GET operations are consecutive based on the targetVariable TYPE byte size.
• The targetVariable type or FIELD variable size determines the byte size and the next position in the file.
• The first byte position in a file is 1.
• GET does not require a byte or record position or targetVariable (or comma) when using a FIELD statement.
• QB64 can PUT the entire contents of an array to a file and later GET those contents to a targetArray() (include brackets).
• GET may ignore the end of a file and return bad data. If the EOF function returns -1 after a GET operation, it indicates that the data has ended.

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

Example 1: Opening a RANDOM file using LEN to calculate and LEN = to designate the file record size.

file$ = "testrand.inf" '<<<< filename may overwrite existing file
number% = 1 '<<<<<<<<<< record number to write cannot be zero
RecordLEN% = LEN(record)
PRINT RecordLEN%; "bytes"
record.x = 255
record.y = "Hello world!"
record.z = 65535
PRINT record.x, record.y, record.z

OPEN file$ FOR...NEXT RANDOM AS #1 LEN = RecordLEN%
PUT #1, number% , record 'change record position number to add records
CLOSE #1

OPEN file$ FOR...NEXT RANDOM AS #2 LEN = RecordLEN%
NumRecords% = LOF(2) \ RecordLEN%
PRINT NumRecords%; "records"

GET #2, NumRecords% , newrec 'GET last record available
CLOSE #2
PRINT newrec.x, newrec.y, newrec.z

END '' ''

 16 bytes
 255        Hello worl       65535
 1 records
 255        Hello worl       65535

Explanation: The byte size of the record TYPE determines the LOF byte size of the file and can determine the number of records.

To read the last record GET the number of records. To add a record, use the number of records + 1 to PUT new record data.

FOR...NEXT i = 1 TO 100
  array(i) = i
NEXT
showme  'display array contents

OPEN "BINFILE.BIN" FOR...NEXT BINARY AS #1

PUT #1, , array()

ERASE array 'clear element values from array and display empty
showme
CLOSE #1

OPEN "BINFILE.BIN" FOR...NEXT BINARY AS #2
GET #2, , array()
CLOSE #2
showme  'display array after transfer from file

END

SUB showme
FOR...NEXT i = 1 TO 100
  PRINT array(i);
NEXT
PRINT "done"
END SUB '' ''

Note: Use empty brackets in QB64 when using GET to create an array or PUT to create a BINARY data file.

• PUT #, SEEK, SEEK (statement)
• INPUT #, GET (TCP/IP statement)
• FIELD, RANDOM, BINARY
• LEN, LOF, EOF