Binary - QB64Official/qb64 GitHub Wiki

See OPEN.

BINARY is used in an OPEN statement to work with the file or port device manipulating its bytes directly.

Syntax

OPEN fileName$ FOR BINARY AS #fileNumber%

Description

  • OPEN FOR BINARY creates the file if the fileName$ does not exist.
  • fileName$ is the name of the file to open, but could also configure a port.
  • #fileNumber% is the number that will represent the file when performing file operations.
  • BINARY files use GET and PUT to read or write the file at any byte position.
  • In version 1.000 and up you can use LINE INPUT in BINARY mode for faster access to text file data.
  • QBasic's BSAVE or BINARY save files can be read using BINARY mode.
  • BINARY mode ignores any LEN = recordlength statement in the OPEN statement.
  • Ports can also be opened in BINARY mode. See: OPEN COM

Example(s)

Shows how a PUT variable value is converted to an ASCII string _MK$ format in a BINARY file.

DIM int64 AS _INTEGER64
DIM byte8 AS STRING * 8
int64 = 12345678
PRINT int64

OPEN "temp64.tmp" FOR BINARY AS #1
PUT #1, , int64                 'the file size will be 8 bytes
CLOSE

PRINT "Press a key to read the file!"
K$ = INPUT$(1)

OPEN "temp64.tmp" FOR BINARY AS #1
GET #1, , byte8                'GET the value as a string
PRINT "text string: "; byte8   'show that string is in _MK$ format

PRINT _CV(_INTEGER64, byte8)   'convert to numerical value
CLOSE

Note: The numerical value does not need to be converted if the file is read using the same numerical variable type as written.

A binary file viewer that can view integer values. The type of value can be changed at DIM.

SCREEN _NEWIMAGE(1000, 600, 256)
_SCREENMOVE _MIDDLE
DIM value AS INTEGER    'value type can be changed
LINE INPUT ; "Enter a BINARY filename to open: ", file$
PRINT " Press S to restart!"

IF LEN(file$) THEN OPEN file$ FOR BINARY AS #1 ELSE END
IF LOF(1) = 0 THEN PRINT "Empty file!": END
DO
  FOR i = 1 TO 16
    x = x + 1
    GET #1, , value
    IF EOF(1) THEN EXIT DO
    PRINT value;
  NEXT
  PRINT CHR$(27); x; "@"; row
  K$ = INPUT$(1)
  IF UCASE$(K$) = "S" THEN CLS: x = 0: row = 0: PRINT "Restarted!": SEEK 1, 1
  IF x = 256 THEN x = 0: row = row + 1: PRINT
LOOP UNTIL K$ = CHR$(27)
CLOSE #1
PRINT "Press Escape to exit!"
DO: _LIMIT 100
LOOP UNTIL INKEY$ = CHR$(27)
SYSTEM

See Also

Add a custom footer
⚠️ **GitHub.com Fallback** ⚠️