Category File I O Functions

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File I/O Functions

Grouped by task. Files and folders lists them beside the rest of the area.

File numbers: open and close files

Function	What it does	From
Open	Opens a file on a file number for reading or writing text, bytes or records.	built-in
FreeFile	Returns an unused file number for Open, or 0 if all 255 are taken.	built-in
Close	Closes one or more file numbers, or every open file when given none.	built-in
Reset	Closes every open file, or resets a redirected standard input or output stream.	built-in
Input (file mode)	Opens a text file for reading with Open; the file must already exist.	built-in
Output	Opens a text file for writing with Open, creating it or emptying it first.	built-in
Append	Opens a text file with Open to add to its end, creating the file if needed.	built-in
Binary	Opens a file with Open for reading and writing bytes at any position.	built-in
Random	Opens a file with Open for reading and writing fixed-size records, 128 bytes by default.	built-in
Access	Limits a Binary or Random file in Open to reading, writing, or both.	built-in
Read (access)	Opens a Binary or Random file for reading only, in an Access clause.	built-in
Write (access)	Opens a Binary or Random file for writing only; an existing file is emptied first.	built-in
Read Write (access)	Opens a Binary or Random file for both reading and writing, the default.	built-in
Encoding	Sets the Unicode encoding of a text file in Open; a file read this way needs a BOM.	built-in

File numbers: read, write and seek

Function	What it does	From
Print #	Writes values as text to an open file; a trailing comma or semicolon skips the line break.	built-in
Write #	Writes values to a file as comma-separated text, strings in quotes, for Input # to read.	built-in
Input #	Reads comma- or line-separated values from a text file into variables.	built-in
Line Input #	Reads one line of a text file into a string, without its line ending.	built-in
Get #	Reads a variable, string or array from a file as bytes, at a position or the current one.	built-in
Put #	Writes a variable, string or array to a file as bytes, at a position or the current one.	built-in
EOF	Returns true when an open file has nothing left to read.	built-in
LOF	Returns the length in bytes of an open file.	built-in
LOC	Returns where the last read or write happened in an open file, counted in records.	built-in
Seek (function)	Returns the 1-based position of the next read or write: bytes, or records for Random.	built-in
Seek (statement)	Sets the 1-based position of the next read or write: bytes, or records for Random.	built-in
Lock	Restricts other programs' access to a record or byte range of an open file.	built-in
Unlock	Removes a restriction that Lock put on a record or byte range.	built-in

Open devices, pipes and the console

Function	What it does	From
Open Com	Opens a serial port on a file number, with its speed, parity and other settings.	built-in
Open Cons	Opens standard input or output on a file number, to use like a file.	built-in
Open Err	Opens standard input and standard error on a file number, to use like a file.	built-in
Open Lpt	Opens a printer on a file number, so Print # and Put # send data to it.	built-in
Open Pipe	Runs a shell command and opens its input or output on a file number.	built-in
Open Scrn	Opens the screen on a file number, for reading and writing like a file.	built-in

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• File I/O Functions

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