flash.filesystem.FileMode (Flex™ 2 Language Reference

Package	flash.filesystem
Class	public class FileMode
Inheritance	FileMode Object

The FileMode class defines string constants used in the fileMode parameter of the open() and openAsync() methods of the FileStream class. The fileMode parameter of these methods determines the capabilities available to the FileStream object once the file is opened.

The following capabilities are available, in various combinations, based on the fileMode specified in the open method:

Reading—The FileStream object can read data from the file.
Writing—The FileStream object can write data to the file.
Creating—The FileStream object creates a non-existent file, upon opening.
Truncate upon opening—Data in the file is deleted upon opening (prior to any data being written).
Append written data—Data is always written to the end of the file (when any write method is called).

The following table shows the capabilities each constant in the FileMode class provides when applied as the fileMode parameter of an open method of a FileStream object:

FileMode constant	Reading	Writing	Creating	Truncate upon opening	Append written data
`READ`	•
`WRITE`		•	•	•
`APPEND`		•	•		•
`UPDATE`	•	•	•

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Class FileMode	Properties \| Methods \| Constants

	Property		Defined by
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object

	Method		Defined by
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object

	Constant		Defined by
		APPEND : String = "append" [static] The file is opened in write mode, with all written data appended to the end of the file.	FileMode
		READ : String = "read" [static] The file is opened in read-only mode.	FileMode
		UPDATE : String = "update" [static] The file is opened in read/write mode.	FileMode
		WRITE : String = "write" [static] The file is opened in write-only mode.	FileMode