File I O Functions

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File I/O Functions

Statements and procedures for working with files and devices.

Description

These statements and procedures provide file and device i/o capabilities. So called file numbers can be bound to files or devices, which can be read or written to using formatted (text mode) or unformatted (binary mode) data. In binary mode, files and devices can be read from or written to in arbitrary locations. For multithreaded applications, files and devices can also be locked.

Opening Files or Devices

Procedures and other keywords that provide read or write access to a file or device.

Reading from and Writing to Files or Devices

Procedures that read and write data to an opened file or device.

File Position and other Info

Procedures that determine where reading and writing will take place within an opened file.

Opening Files or Devices

FreeFile

Gets an available file number that can be used to read or write from files or devices.

Open

Binds a file number to a physical file to provide reading and writing capabilities.

Open Com

Binds a file number to a communications port.

Open Cons

Binds a file number to the standard input and output streams.

Open Err

Binds a file number to the standard input and error streams.

Open Lpt

Binds a file number to a printer device.

Open Pipe

Binds a file number to the input and output streams of a process.

Open Scrn

Binds a file number directly to the console.

Close

Unbinds a file number from a file or device.

Reset

Unbinds all active file numbers.

File I/O modes

Input (File Mode)

Text data can be read from the file.

Output

Text data can be written to the file.

Append

Text data is added to the end of a file when output.

Binary

Arbitrary data can be read from or written to the file.

Random

Blocks of data of certain size can be read from and written to the file.

File access privileges

Access

An overview of file access privileges.

Read (File Access)

Binary data can only be read from the file.

Write (File Access)

Binary data can only be written to the file.

Read Write(File Access)

Binary data can be read from and written to the file.

Character encoding

Encoding

Specifies the character encoding of a file.

Reading from and Writing to Files or Devices

Input #

Reads a list of values from a file or device.

Write #

Writes a list of values to a file or device.

Input()

Reads a number of characters from a file or device.

Winput()

Reads a number of wide characters from a file or device.

Line Input #

Reads a line of text from a file or device.

Print # ? # (Shortcut For 'Print #')

Writes text data to a file or device.

Put #

Writes arbitrary data to a file or device.

Get #

Reads arbitrary data from a file or device.

File Position and other Info

LOF

Gets the length (in bytes) of a file.

LOC

Gets the file position of the last read or write operation.

EOF

Returns true if all of the data has been read from a file.

Seek (Statement)

Sets the file position of the next read or write operation.

Seek (Function)

Gets the file position of the next read or write operation.

Lock

Restricts read or write access to a file or portion of a file.

Unlock

Remove read or write restrictions from a previous Lock command.

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Category: File I/O Functions

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.