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https://github.com/DualBrain/QB64.git
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88 lines
2.7 KiB
Markdown
88 lines
2.7 KiB
Markdown
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See [OPEN](OPEN).
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[BINARY](BINARY) is used in an [OPEN](OPEN) statement to work with the file or port device manipulating its bytes directly.
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## Syntax
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> [OPEN](OPEN) fileName$ [FOR](FOR) [BINARY](BINARY) [AS](AS) #fileNumber%
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## Description
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* [OPEN](OPEN) FOR BINARY creates the file if the fileName$ does not exist.
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* fileName$ is the name of the file to open, but could also configure a port.
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* #fileNumber% is the number that will represent the file when performing file operations.
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* BINARY files use [GET](GET) and [PUT](PUT) to read or write the file at any byte position.
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* In **version 1.000 and up** you can use [LINE INPUT](LINE-INPUT) in [BINARY](BINARY) mode for faster access to text file data.
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* QBasic's [BSAVE](BSAVE) or BINARY save files can be read using BINARY mode.
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* BINARY mode ignores any [LEN](LEN) = recordlength statement in the [OPEN](OPEN) statement.
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* Ports can also be opened in [BINARY](BINARY) mode. See: [OPEN COM](OPEN-COM)
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## Example(s)
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Shows how a PUT variable value is converted to an [ASCII](ASCII) string [_MK$](_MK$) format in a BINARY file.
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```vb
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DIM int64 AS _INTEGER64
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DIM byte8 AS STRING * 8
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int64 = 12345678
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PRINT int64
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OPEN "temp64.tmp" FOR BINARY AS #1
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PUT #1, , int64 'the file size will be 8 bytes
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CLOSE
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PRINT "Press a key to read the file!"
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K$ = INPUT$(1)
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OPEN "temp64.tmp" FOR BINARY AS #1
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GET #1, , byte8 'GET the value as a string
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PRINT "text string: "; byte8 'show that string is in _MK$ format
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PRINT _CV(_INTEGER64, byte8) 'convert to numerical value
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CLOSE
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```
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> *Note:* The numerical value does not need to be converted if the file is read using the same numerical variable type as written.
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A binary file viewer that can view integer values. The type of value can be changed at [DIM](DIM).
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```vb
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SCREEN _NEWIMAGE(1000, 600, 256)
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_SCREENMOVE _MIDDLE
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DIM value AS INTEGER 'value type can be changed
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LINE INPUT ; "Enter a BINARY filename to open: ", file$
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PRINT " Press S to restart!"
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IF LEN(file$) THEN OPEN file$ FOR BINARY AS #1 ELSE END
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IF LOF(1) = 0 THEN PRINT "Empty file!": END
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DO
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FOR i = 1 TO 16
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x = x + 1
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GET #1, , value
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IF EOF(1) THEN EXIT DO
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PRINT value;
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NEXT
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PRINT CHR$(27); x; "@"; row
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K$ = INPUT$(1)
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IF UCASE$(K$) = "S" THEN CLS: x = 0: row = 0: PRINT "Restarted!": SEEK 1, 1
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IF x = 256 THEN x = 0: row = row + 1: PRINT
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LOOP UNTIL K$ = CHR$(27)
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CLOSE #1
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PRINT "Press Escape to exit!"
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DO: _LIMIT 100
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LOOP UNTIL INKEY$ = CHR$(27)
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SYSTEM
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```
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## See Also
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* [OPEN](OPEN), [CLOSE](CLOSE)
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* [GET](GET), [PUT](PUT), [LINE INPUT](LINE-INPUT)
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* [SEEK](SEEK) (function), [SEEK (statement)](SEEK-(statement))
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* [INPUT (file mode)](INPUT-(file-mode)), [RANDOM](RANDOM), [APPEND](APPEND), [OUTPUT](OUTPUT)
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* [Bitmaps](Bitmaps), [Binary](Binary) (numbers)
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