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FileAccess¶

Provides methods for file reading and writing operations.

Description¶

This class can be used to permanently store data in the user device's file system and to read from it. This is useful for store game save data or player configuration files.

Here's a sample on how to write and read from a file:

func save(content):
    var file = FileAccess.open("user://save_game.dat", FileAccess.WRITE)
    file.store_string(content)

func load():
    var file = FileAccess.open("user://save_game.dat", FileAccess.READ)
    var content = file.get_as_text()
    return content

public void Save(string content)
{
    using var file = FileAccess.Open("user://save_game.dat", FileAccess.ModeFlags.Write);
    file.StoreString(content);
}

public string Load()
{
    using var file = FileAccess.Open("user://save_game.dat", FileAccess.ModeFlags.Read);
    string content = file.GetAsText();
    return content;
}

In the example above, the file will be saved in the user data folder as specified in the Data paths documentation.

FileAccess will close when it's freed, which happens when it goes out of scope or when it gets assigned with null. close can be used to close it before then explicitly. In C# the reference must be disposed manually, which can be done with the using statement or by calling the Dispose method directly.

Note: To access project resources once exported, it is recommended to use ResourceLoader instead of FileAccess, as some files are converted to engine-specific formats and their original source files might not be present in the exported PCK package.

Note: Files are automatically closed only if the process exits "normally" (such as by clicking the window manager's close button or pressing Alt + F4). If you stop the project execution by pressing F8 while the project is running, the file won't be closed as the game process will be killed. You can work around this by calling flush at regular intervals.

Tutorials¶

Properties¶

bool	big_endian

Methods¶

void	close ( )
bool	eof_reached ( ) const
bool	file_exists ( String path ) static
void	flush ( )
int	get_16 ( ) const
int	get_32 ( ) const
int	get_64 ( ) const
int	get_8 ( ) const
String	get_as_text ( bool skip_cr=false ) const
PackedByteArray	get_buffer ( int length ) const
PackedStringArray	get_csv_line ( String delim="," ) const
float	get_double ( ) const
Error	get_error ( ) const
PackedByteArray	get_file_as_bytes ( String path ) static
String	get_file_as_string ( String path ) static
float	get_float ( ) const
int	get_length ( ) const
String	get_line ( ) const
String	get_md5 ( String path ) static
int	get_modified_time ( String file ) static
Error	get_open_error ( ) static
String	get_pascal_string ( )
String	get_path ( ) const
String	get_path_absolute ( ) const
int	get_position ( ) const
float	get_real ( ) const
String	get_sha256 ( String path ) static
Variant	get_var ( bool allow_objects=false ) const
bool	is_open ( ) const
FileAccess	open ( String path, ModeFlags flags ) static
FileAccess	open_compressed ( String path, ModeFlags mode_flags, CompressionMode compression_mode=0 ) static
FileAccess	open_encrypted ( String path, ModeFlags mode_flags, PackedByteArray key ) static
FileAccess	open_encrypted_with_pass ( String path, ModeFlags mode_flags, String pass ) static
void	seek ( int position )
void	seek_end ( int position=0 )
void	store_16 ( int value )
void	store_32 ( int value )
void	store_64 ( int value )
void	store_8 ( int value )
void	store_buffer ( PackedByteArray buffer )
void	store_csv_line ( PackedStringArray values, String delim="," )
void	store_double ( float value )
void	store_float ( float value )
void	store_line ( String line )
void	store_pascal_string ( String string )
void	store_real ( float value )
void	store_string ( String string )
void	store_var ( Variant value, bool full_objects=false )

Enumerations¶

enum ModeFlags:

ModeFlags READ = 1

Opens the file for read operations. The cursor is positioned at the beginning of the file.

ModeFlags WRITE = 2

Opens the file for write operations. The file is created if it does not exist, and truncated if it does.

ModeFlags READ_WRITE = 3

Opens the file for read and write operations. Does not truncate the file. The cursor is positioned at the beginning of the file.

ModeFlags WRITE_READ = 7

Opens the file for read and write operations. The file is created if it does not exist, and truncated if it does. The cursor is positioned at the beginning of the file.

enum CompressionMode:

CompressionMode COMPRESSION_FASTLZ = 0

Uses the FastLZ compression method.

CompressionMode COMPRESSION_DEFLATE = 1

Uses the DEFLATE compression method.

CompressionMode COMPRESSION_ZSTD = 2

Uses the Zstandard compression method.

CompressionMode COMPRESSION_GZIP = 3

Uses the gzip compression method.

Property Descriptions¶

bool big_endian

void set_big_endian ( bool value )
bool is_big_endian ( )

If true, the file is read with big-endian endianness. If false, the file is read with little-endian endianness. If in doubt, leave this to false as most files are written with little-endian endianness.

Note: big_endian is only about the file format, not the CPU type. The CPU endianness doesn't affect the default endianness for files written.

Note: This is always reset to false whenever you open the file. Therefore, you must set big_endian after opening the file, not before.

Method Descriptions¶

void close ( )

Closes the currently opened file and prevents subsequent read/write operations. Use flush to persist the data to disk without closing the file.

Note: FileAccess will automatically close when it's freed, which happens when it goes out of scope or when it gets assigned with null. In C# the reference must be disposed after we are done using it, this can be done with the using statement or calling the Dispose method directly.

bool eof_reached ( ) const

Returns true if the file cursor has already read past the end of the file.

Note: eof_reached() == false cannot be used to check whether there is more data available. To loop while there is more data available, use:

while file.get_position() < file.get_length():
    # Read data

while (file.GetPosition() < file.GetLength())
{
    // Read data
}

bool file_exists ( String path ) static

Returns true if the file exists in the given path.

Note: Many resources types are imported (e.g. textures or sound files), and their source asset will not be included in the exported game, as only the imported version is used. See ResourceLoader.exists for an alternative approach that takes resource remapping into account.

For a non-static, relative equivalent, use DirAccess.file_exists.

void flush ( )

Writes the file's buffer to disk. Flushing is automatically performed when the file is closed. This means you don't need to call flush manually before closing a file. Still, calling flush can be used to ensure the data is safe even if the project crashes instead of being closed gracefully.

Note: Only call flush when you actually need it. Otherwise, it will decrease performance due to constant disk writes.

int get_16 ( ) const

Returns the next 16 bits from the file as an integer. See store_16 for details on what values can be stored and retrieved this way.

int get_32 ( ) const

Returns the next 32 bits from the file as an integer. See store_32 for details on what values can be stored and retrieved this way.

int get_64 ( ) const

Returns the next 64 bits from the file as an integer. See store_64 for details on what values can be stored and retrieved this way.

int get_8 ( ) const

Returns the next 8 bits from the file as an integer. See store_8 for details on what values can be stored and retrieved this way.

String get_as_text ( bool skip_cr=false ) const

Returns the whole file as a String. Text is interpreted as being UTF-8 encoded.

If skip_cr is true, carriage return characters (\r, CR) will be ignored when parsing the UTF-8, so that only line feed characters (\n, LF) represent a new line (Unix convention).

PackedByteArray get_buffer ( int length ) const

Returns next length bytes of the file as a PackedByteArray.

PackedStringArray get_csv_line ( String delim="," ) const

Returns the next value of the file in CSV (Comma-Separated Values) format. You can pass a different delimiter delim to use other than the default "," (comma). This delimiter must be one-character long, and cannot be a double quotation mark.

Text is interpreted as being UTF-8 encoded. Text values must be enclosed in double quotes if they include the delimiter character. Double quotes within a text value can be escaped by doubling their occurrence.

For example, the following CSV lines are valid and will be properly parsed as two strings each:

Alice,"Hello, Bob!"
Bob,Alice! What a surprise!
Alice,"I thought you'd reply with ""Hello, world""."

Note how the second line can omit the enclosing quotes as it does not include the delimiter. However it could very well use quotes, it was only written without for demonstration purposes. The third line must use "" for each quotation mark that needs to be interpreted as such instead of the end of a text value.

float get_double ( ) const

Returns the next 64 bits from the file as a floating-point number.

Error get_error ( ) const

Returns the last error that happened when trying to perform operations. Compare with the ERR_FILE_* constants from Error.

PackedByteArray get_file_as_bytes ( String path ) static

Returns the whole path file contents as a PackedByteArray without any decoding.

String get_file_as_string ( String path ) static

Returns the whole path file contents as a String. Text is interpreted as being UTF-8 encoded.

float get_float ( ) const

Returns the next 32 bits from the file as a floating-point number.

int get_length ( ) const

Returns the size of the file in bytes.

String get_line ( ) const

Returns the next line of the file as a String.

Text is interpreted as being UTF-8 encoded.

String get_md5 ( String path ) static

Returns an MD5 String representing the file at the given path or an empty String on failure.

int get_modified_time ( String file ) static

Returns the last time the file was modified in Unix timestamp format or returns a String "ERROR IN file". This Unix timestamp can be converted to another format using the Time singleton.

Error get_open_error ( ) static

Returns the result of the last open call in the current thread.

String get_pascal_string ( )

Returns a String saved in Pascal format from the file.

Text is interpreted as being UTF-8 encoded.

String get_path ( ) const

Returns the path as a String for the current open file.

String get_path_absolute ( ) const

Returns the absolute path as a String for the current open file.

int get_position ( ) const

Returns the file cursor's position.

float get_real ( ) const

Returns the next bits from the file as a floating-point number.