b8c08ba5ad
Adds a few more complex edge cases which are supported. Also adds some documentation, simplifies the code a bit and forbids using double quotes as a delimiter.
453 lines
21 KiB
XML
453 lines
21 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="File" inherits="RefCounted" version="4.0">
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<brief_description>
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Type to handle file reading and writing operations.
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</brief_description>
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<description>
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File type. This is used to permanently store data into the user device's file system and to read from it. This can be used to store game save data or player configuration files, for example.
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Here's a sample on how to write and read from a file:
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[codeblocks]
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[gdscript]
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func save(content):
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var file = File.new()
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file.open("user://save_game.dat", File.WRITE)
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file.store_string(content)
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file.close()
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func load():
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var file = File.new()
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file.open("user://save_game.dat", File.READ)
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var content = file.get_as_text()
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file.close()
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return content
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[/gdscript]
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[csharp]
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public void Save(string content)
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{
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var file = new File();
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file.Open("user://save_game.dat", File.ModeFlags.Write);
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file.StoreString(content);
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file.Close();
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}
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public string Load()
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{
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var file = new File();
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file.Open("user://save_game.dat", File.ModeFlags.Read);
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string content = file.GetAsText();
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file.Close();
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return content;
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}
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[/csharp]
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[/codeblocks]
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In the example above, the file will be saved in the user data folder as specified in the [url=https://docs.godotengine.org/en/latest/tutorials/io/data_paths.html]Data paths[/url] documentation.
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[b]Note:[/b] To access project resources once exported, it is recommended to use [ResourceLoader] instead of the [File] API, as some files are converted to engine-specific formats and their original source files might not be present in the exported PCK package.
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[b]Note:[/b] Files are automatically closed only if the process exits "normally" (such as by clicking the window manager's close button or pressing [b]Alt + F4[/b]). If you stop the project execution by pressing [b]F8[/b] 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 [method flush] at regular intervals.
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</description>
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<tutorials>
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<link title="File system">https://docs.godotengine.org/en/latest/getting_started/step_by_step/filesystem.html</link>
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<link title="3D Voxel Demo">https://godotengine.org/asset-library/asset/676</link>
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</tutorials>
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<methods>
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<method name="close">
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<return type="void" />
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<description>
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Closes the currently opened file and prevents subsequent read/write operations. Use [method flush] to persist the data to disk without closing the file.
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</description>
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</method>
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<method name="eof_reached" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if the file cursor has read past the end of the file.
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[b]Note:[/b] This function will still return [code]false[/code] while at the end of the file and only activates when reading past it. This can be confusing but it conforms to how low-level file access works in all operating systems. There is always [method get_length] and [method get_position] to implement a custom logic.
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</description>
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</method>
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<method name="file_exists" qualifiers="const">
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<return type="bool" />
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<argument index="0" name="path" type="String" />
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<description>
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Returns [code]true[/code] if the file exists in the given path.
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[b]Note:[/b] 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 [method ResourceLoader.exists] for an alternative approach that takes resource remapping into account.
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</description>
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</method>
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<method name="flush">
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<return type="void" />
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<description>
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Writes the file's buffer to disk. Flushing is automatically performed when the file is closed. This means you don't need to call [method flush] manually before closing a file using [method close]. Still, calling [method flush] can be used to ensure the data is safe even if the project crashes instead of being closed gracefully.
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[b]Note:[/b] Only call [method flush] when you actually need it. Otherwise, it will decrease performance due to constant disk writes.
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</description>
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</method>
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<method name="get_16" qualifiers="const">
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<return type="int" />
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<description>
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Returns the next 16 bits from the file as an integer. See [method store_16] for details on what values can be stored and retrieved this way.
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</description>
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</method>
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<method name="get_32" qualifiers="const">
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<return type="int" />
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<description>
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Returns the next 32 bits from the file as an integer. See [method store_32] for details on what values can be stored and retrieved this way.
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</description>
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</method>
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<method name="get_64" qualifiers="const">
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<return type="int" />
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<description>
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Returns the next 64 bits from the file as an integer. See [method store_64] for details on what values can be stored and retrieved this way.
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</description>
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</method>
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<method name="get_8" qualifiers="const">
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<return type="int" />
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<description>
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Returns the next 8 bits from the file as an integer. See [method store_8] for details on what values can be stored and retrieved this way.
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</description>
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</method>
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<method name="get_as_text" qualifiers="const">
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<return type="String" />
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<description>
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Returns the whole file as a [String].
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Text is interpreted as being UTF-8 encoded.
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</description>
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</method>
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<method name="get_buffer" qualifiers="const">
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<return type="PackedByteArray" />
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<argument index="0" name="length" type="int" />
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<description>
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Returns next [code]length[/code] bytes of the file as a [PackedByteArray].
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</description>
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</method>
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<method name="get_csv_line" qualifiers="const">
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<return type="PackedStringArray" />
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<argument index="0" name="delim" type="String" default="","" />
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<description>
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Returns the next value of the file in CSV (Comma-Separated Values) format. You can pass a different delimiter [code]delim[/code] to use other than the default [code]","[/code] (comma). This delimiter must be one-character long, and cannot be a double quotation mark.
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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.
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For example, the following CSV lines are valid and will be properly parsed as two strings each:
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[codeblock]
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Alice,"Hello, Bob!"
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Bob,Alice! What a surprise!
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Alice,"I thought you'd reply with ""Hello, world""."
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[/codeblock]
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Note how the second line can omit the enclosing quotes as it does not include the delimiter. However it [i]could[/i] very well use quotes, it was only written without for demonstration purposes. The third line must use [code]""[/code] for each quotation mark that needs to be interpreted as such instead of the end of a text value.
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</description>
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</method>
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<method name="get_double" qualifiers="const">
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<return type="float" />
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<description>
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Returns the next 64 bits from the file as a floating-point number.
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</description>
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</method>
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<method name="get_error" qualifiers="const">
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<return type="int" enum="Error" />
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<description>
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Returns the last error that happened when trying to perform operations. Compare with the [code]ERR_FILE_*[/code] constants from [enum Error].
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</description>
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</method>
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<method name="get_float" qualifiers="const">
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<return type="float" />
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<description>
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Returns the next 32 bits from the file as a floating-point number.
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</description>
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</method>
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<method name="get_length" qualifiers="const">
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<return type="int" />
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<description>
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Returns the size of the file in bytes.
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</description>
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</method>
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<method name="get_line" qualifiers="const">
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<return type="String" />
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<description>
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Returns the next line of the file as a [String].
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Text is interpreted as being UTF-8 encoded.
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</description>
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</method>
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<method name="get_md5" qualifiers="const">
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<return type="String" />
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<argument index="0" name="path" type="String" />
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<description>
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Returns an MD5 String representing the file at the given path or an empty [String] on failure.
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</description>
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</method>
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<method name="get_modified_time" qualifiers="const">
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<return type="int" />
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<argument index="0" name="file" type="String" />
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<description>
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Returns the last time the [code]file[/code] was modified in Unix timestamp format or returns a [String] "ERROR IN [code]file[/code]". This Unix timestamp can be converted to another format using the [Time] singleton.
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</description>
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</method>
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<method name="get_pascal_string">
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<return type="String" />
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<description>
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Returns a [String] saved in Pascal format from the file.
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Text is interpreted as being UTF-8 encoded.
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</description>
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</method>
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<method name="get_path" qualifiers="const">
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<return type="String" />
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<description>
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Returns the path as a [String] for the current open file.
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</description>
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</method>
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<method name="get_path_absolute" qualifiers="const">
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<return type="String" />
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<description>
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Returns the absolute path as a [String] for the current open file.
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</description>
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</method>
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<method name="get_position" qualifiers="const">
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<return type="int" />
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<description>
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Returns the file cursor's position.
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</description>
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</method>
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<method name="get_real" qualifiers="const">
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<return type="float" />
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<description>
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Returns the next bits from the file as a floating-point number.
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</description>
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</method>
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<method name="get_sha256" qualifiers="const">
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<return type="String" />
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<argument index="0" name="path" type="String" />
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<description>
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Returns a SHA-256 [String] representing the file at the given path or an empty [String] on failure.
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</description>
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</method>
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<method name="get_var" qualifiers="const">
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<return type="Variant" />
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<argument index="0" name="allow_objects" type="bool" default="false" />
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<description>
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Returns the next [Variant] value from the file. If [code]allow_objects[/code] is [code]true[/code], decoding objects is allowed.
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[b]Warning:[/b] Deserialized objects can contain code which gets executed. Do not use this option if the serialized object comes from untrusted sources to avoid potential security threats such as remote code execution.
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</description>
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</method>
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<method name="is_open" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if the file is currently opened.
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</description>
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</method>
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<method name="open">
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<return type="int" enum="Error" />
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<argument index="0" name="path" type="String" />
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<argument index="1" name="flags" type="int" enum="File.ModeFlags" />
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<description>
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Opens the file for writing or reading, depending on the flags.
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</description>
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</method>
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<method name="open_compressed">
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<return type="int" enum="Error" />
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<argument index="0" name="path" type="String" />
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<argument index="1" name="mode_flags" type="int" enum="File.ModeFlags" />
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<argument index="2" name="compression_mode" type="int" enum="File.CompressionMode" default="0" />
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<description>
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Opens a compressed file for reading or writing.
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[b]Note:[/b] [method open_compressed] can only read files that were saved by Godot, not third-party compression formats. See [url=https://github.com/godotengine/godot/issues/28999]GitHub issue #28999[/url] for a workaround.
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</description>
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</method>
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<method name="open_encrypted">
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<return type="int" enum="Error" />
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<argument index="0" name="path" type="String" />
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<argument index="1" name="mode_flags" type="int" enum="File.ModeFlags" />
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<argument index="2" name="key" type="PackedByteArray" />
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<description>
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Opens an encrypted file in write or read mode. You need to pass a binary key to encrypt/decrypt it.
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[b]Note:[/b] The provided key must be 32 bytes long.
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</description>
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</method>
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<method name="open_encrypted_with_pass">
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<return type="int" enum="Error" />
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<argument index="0" name="path" type="String" />
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<argument index="1" name="mode_flags" type="int" enum="File.ModeFlags" />
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<argument index="2" name="pass" type="String" />
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<description>
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Opens an encrypted file in write or read mode. You need to pass a password to encrypt/decrypt it.
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</description>
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</method>
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<method name="seek">
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<return type="void" />
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<argument index="0" name="position" type="int" />
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<description>
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Changes the file reading/writing cursor to the specified position (in bytes from the beginning of the file).
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</description>
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</method>
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<method name="seek_end">
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<return type="void" />
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<argument index="0" name="position" type="int" default="0" />
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<description>
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Changes the file reading/writing cursor to the specified position (in bytes from the end of the file).
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[b]Note:[/b] This is an offset, so you should use negative numbers or the cursor will be at the end of the file.
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</description>
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</method>
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<method name="store_16">
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<return type="void" />
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<argument index="0" name="value" type="int" />
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<description>
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Stores an integer as 16 bits in the file.
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[b]Note:[/b] The [code]value[/code] should lie in the interval [code][0, 2^16 - 1][/code]. Any other value will overflow and wrap around.
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To store a signed integer, use [method store_64] or store a signed integer from the interval [code][-2^15, 2^15 - 1][/code] (i.e. keeping one bit for the signedness) and compute its sign manually when reading. For example:
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[codeblocks]
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[gdscript]
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const MAX_15B = 1 << 15
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const MAX_16B = 1 << 16
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func unsigned16_to_signed(unsigned):
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return (unsigned + MAX_15B) % MAX_16B - MAX_15B
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func _ready():
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var f = File.new()
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f.open("user://file.dat", File.WRITE_READ)
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f.store_16(-42) # This wraps around and stores 65494 (2^16 - 42).
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f.store_16(121) # In bounds, will store 121.
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f.seek(0) # Go back to start to read the stored value.
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var read1 = f.get_16() # 65494
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var read2 = f.get_16() # 121
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var converted1 = unsigned16_to_signed(read1) # -42
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var converted2 = unsigned16_to_signed(read2) # 121
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[/gdscript]
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[csharp]
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public override void _Ready()
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{
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var f = new File();
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f.Open("user://file.dat", File.ModeFlags.WriteRead);
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f.Store16(unchecked((ushort)-42)); // This wraps around and stores 65494 (2^16 - 42).
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f.Store16(121); // In bounds, will store 121.
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f.Seek(0); // Go back to start to read the stored value.
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ushort read1 = f.Get16(); // 65494
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ushort read2 = f.Get16(); // 121
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short converted1 = BitConverter.ToInt16(BitConverter.GetBytes(read1), 0); // -42
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short converted2 = BitConverter.ToInt16(BitConverter.GetBytes(read2), 0); // 121
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}
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[/csharp]
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[/codeblocks]
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</description>
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</method>
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<method name="store_32">
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<return type="void" />
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<argument index="0" name="value" type="int" />
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<description>
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Stores an integer as 32 bits in the file.
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[b]Note:[/b] The [code]value[/code] should lie in the interval [code][0, 2^32 - 1][/code]. Any other value will overflow and wrap around.
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To store a signed integer, use [method store_64], or convert it manually (see [method store_16] for an example).
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</description>
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</method>
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<method name="store_64">
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<return type="void" />
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<argument index="0" name="value" type="int" />
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<description>
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Stores an integer as 64 bits in the file.
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[b]Note:[/b] The [code]value[/code] must lie in the interval [code][-2^63, 2^63 - 1][/code] (i.e. be a valid [int] value).
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</description>
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</method>
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<method name="store_8">
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<return type="void" />
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<argument index="0" name="value" type="int" />
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<description>
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Stores an integer as 8 bits in the file.
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[b]Note:[/b] The [code]value[/code] should lie in the interval [code][0, 255][/code]. Any other value will overflow and wrap around.
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To store a signed integer, use [method store_64], or convert it manually (see [method store_16] for an example).
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</description>
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</method>
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<method name="store_buffer">
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<return type="void" />
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<argument index="0" name="buffer" type="PackedByteArray" />
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<description>
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Stores the given array of bytes in the file.
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</description>
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</method>
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<method name="store_csv_line">
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<return type="void" />
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<argument index="0" name="values" type="PackedStringArray" />
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<argument index="1" name="delim" type="String" default="","" />
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<description>
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Store the given [PackedStringArray] in the file as a line formatted in the CSV (Comma-Separated Values) format. You can pass a different delimiter [code]delim[/code] to use other than the default [code]","[/code] (comma). This delimiter must be one-character long.
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Text will be encoded as UTF-8.
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</description>
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</method>
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<method name="store_double">
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<return type="void" />
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<argument index="0" name="value" type="float" />
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<description>
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Stores a floating-point number as 64 bits in the file.
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</description>
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</method>
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<method name="store_float">
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<return type="void" />
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<argument index="0" name="value" type="float" />
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<description>
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Stores a floating-point number as 32 bits in the file.
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</description>
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</method>
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<method name="store_line">
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<return type="void" />
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<argument index="0" name="line" type="String" />
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<description>
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Appends [code]line[/code] to the file followed by a line return character ([code]\n[/code]), encoding the text as UTF-8.
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</description>
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</method>
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<method name="store_pascal_string">
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<return type="void" />
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<argument index="0" name="string" type="String" />
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<description>
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Stores the given [String] as a line in the file in Pascal format (i.e. also store the length of the string).
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Text will be encoded as UTF-8.
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</description>
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</method>
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<method name="store_real">
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<return type="void" />
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<argument index="0" name="value" type="float" />
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<description>
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Stores a floating-point number in the file.
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</description>
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</method>
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<method name="store_string">
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<return type="void" />
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<argument index="0" name="string" type="String" />
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<description>
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Appends [code]string[/code] to the file without a line return, encoding the text as UTF-8.
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</description>
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</method>
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<method name="store_var">
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<return type="void" />
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<argument index="0" name="value" type="Variant" />
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<argument index="1" name="full_objects" type="bool" default="false" />
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<description>
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Stores any Variant value in the file. If [code]full_objects[/code] is [code]true[/code], encoding objects is allowed (and can potentially include code).
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[b]Note:[/b] Not all properties are included. Only properties that are configured with the [constant PROPERTY_USAGE_STORAGE] flag set will be serialized. You can add a new usage flag to a property by overriding the [method Object._get_property_list] method in your class. You can also check how property usage is configured by calling [method Object._get_property_list]. See [enum PropertyUsageFlags] for the possible usage flags.
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</description>
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</method>
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</methods>
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<members>
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|
<member name="big_endian" type="bool" setter="set_big_endian" getter="is_big_endian" default="false">
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If [code]true[/code], the file is read with big-endian [url=https://en.wikipedia.org/wiki/Endianness]endianness[/url]. If [code]false[/code], the file is read with little-endian endianness. If in doubt, leave this to [code]false[/code] as most files are written with little-endian endianness.
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[b]Note:[/b] [member big_endian] is only about the file format, not the CPU type. The CPU endianness doesn't affect the default endianness for files written.
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[b]Note:[/b] This is always reset to [code]false[/code] whenever you open the file. Therefore, you must set [member big_endian] [i]after[/i] opening the file, not before.
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</member>
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</members>
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|
<constants>
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|
<constant name="READ" value="1" enum="ModeFlags">
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|
Opens the file for read operations. The cursor is positioned at the beginning of the file.
|
|
</constant>
|
|
<constant name="WRITE" value="2" enum="ModeFlags">
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|
Opens the file for write operations. The file is created if it does not exist, and truncated if it does.
|
|
</constant>
|
|
<constant name="READ_WRITE" value="3" enum="ModeFlags">
|
|
Opens the file for read and write operations. Does not truncate the file. The cursor is positioned at the beginning of the file.
|
|
</constant>
|
|
<constant name="WRITE_READ" value="7" enum="ModeFlags">
|
|
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.
|
|
</constant>
|
|
<constant name="COMPRESSION_FASTLZ" value="0" enum="CompressionMode">
|
|
Uses the [url=http://fastlz.org/]FastLZ[/url] compression method.
|
|
</constant>
|
|
<constant name="COMPRESSION_DEFLATE" value="1" enum="CompressionMode">
|
|
Uses the [url=https://en.wikipedia.org/wiki/DEFLATE]DEFLATE[/url] compression method.
|
|
</constant>
|
|
<constant name="COMPRESSION_ZSTD" value="2" enum="CompressionMode">
|
|
Uses the [url=https://facebook.github.io/zstd/]Zstandard[/url] compression method.
|
|
</constant>
|
|
<constant name="COMPRESSION_GZIP" value="3" enum="CompressionMode">
|
|
Uses the [url=https://www.gzip.org/]gzip[/url] compression method.
|
|
</constant>
|
|
</constants>
|
|
</class>
|