When you open a FileStream object, you make it available to read
and write data to a file. You open a FileStream object by passing
a File object to the
open()
or
openAsync()
method of
the FileStream object:
var myFile:File = File.documentsDirectory.resolvePath("AIR Test/test.txt");
var myFileStream:FileStream = new FileStream();
myFileStream.open(myFile, FileMode.READ);
The
fileMode
parameter (the second parameter
of the
open()
and
openAsync()
methods),
specifies the mode in which to open the file: for read, write, append,
or update. For details, see the previous section,
FileStream open modes
.
If you use the
openAsync()
method to open the
file for asynchronous file operations, set up event listeners to
handle the asynchronous events:
var myFile:File = File.documentsDirectory.resolvePath("AIR Test/test.txt");
var myFileStream:FileStream = new FileStream();
myFileStream.addEventListener(Event.COMPLETE, completeHandler);
myFileStream.addEventListener(ProgressEvent.PROGRESS, progressHandler);
myFileStream.addEventListener(IOErrorEvent.IO_Error, errorHandler);
myFileStream.openAsync(myFile, FileMode.READ);
function completeHandler(event:Event):void {
// ...
}
function progressHandler(event:ProgressEvent):void {
// ...
}
function errorHandler(event:IOErrorEvent):void {
// ...
}
The file is opened for synchronous or asynchronous operations,
depending upon whether you use the
open()
or
openAsync()
method.
For details, see
AIR file basics
.
If you set the
fileMode
parameter to
FileMode.READ
or
FileMode.UPDATE
in
the open method of the FileStream object, data is read into the
read buffer as soon as you open the FileStream object. For details,
see
The read buffer and the bytesAvailable property of a FileStream object
.
You can call the
close()
method of a FileStream object
to close the associated file, making it available for use by other
applications.
