File and FileStream within AIR

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By Rich Tretola | February 25, 2008

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Local access to the file system is what separates AIR from browser based Flex/Flash. This simple sample demonstrates how to read and write files to the local file system.

Here is the function that loads a file:

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private function loadFile():void{
var file:File = File.desktopDirectory.resolvePath("Files/" + fdg.selectedItem.name);;
stream = new FileStream();
stream.open(file, FileMode.READ);
var str:String = stream.readUTFBytes(stream.bytesAvailable);
stream.close();
str = str.replace(File.lineEnding, "\n");
contents.text = str;
fileName.text = file.name;
}

Here is the function that saves the file:

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private function saveFile():void{
var myPattern:RegExp = / /g;
var newFileName:String = fileName.text.replace('.txt','');
if(newFileName.length > 1){
var file:File = File.desktopDirectory.resolvePath("Files/" + newFileName.replace(myPattern,'_') + ".txt");
var stream:FileStream = new FileStream()
stream.open(file, FileMode.WRITE);
var str:String = contents.text;
str = str.replace(/\r/g, File.lineEnding);
stream.writeUTFBytes(str);
stream.close();
fdg.directory = File.desktopDirectory.resolvePath("Files/");
fileName.text = "";
contents.text = "";
} else {
mx.controls.Alert.show("File name is required", "Error Saving File");
}
}

Note that although this application uses File.desktopDirectory, you also have easy access within Apollo to:

File.applicationDirectory
File.applicationStorageDirectory
File.desktopDirectory
File.documentsDirectory
File.userDirectory

Here is the full source:

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<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="init()" width="808" height="484"
backgroundGradientColors="[#FFFFFF, #5df098]">

<mx:Script>
<![CDATA[

import flash.filesystem.*;

private var stream:FileStream;

private function init():void{
var file:File = File.desktopDirectory.resolvePath("Files/sample.txt");
var stream:FileStream = new FileStream()
stream.open(file, FileMode.WRITE);
var str:String = "This is a sample file";
stream.writeUTFBytes(str);
stream.close();
fdg.directory = File.desktopDirectory.resolvePath("Files/");
}

private function saveFile():void{
var myPattern:RegExp = / /g;
var newFileName:String = fileName.text.replace('.txt','');
if(newFileName.length > 1){
var file:File = File.desktopDirectory.resolvePath("Files/" + newFileName.replace(myPattern,'_') + ".txt");
var stream:FileStream = new FileStream()
stream.open(file, FileMode.WRITE);
var str:String = contents.text;
str = str.replace(/\r/g, File.lineEnding);
stream.writeUTFBytes(str);
stream.close();
fdg.directory = File.desktopDirectory.resolvePath("Files/");
fileName.text = "";
contents.text = "";
} else {
mx.controls.Alert.show("File name is required", "Error Saving File");
}
}

private function loadFile():void{
var file:File = File.desktopDirectory.resolvePath("Files/" + fdg.selectedItem.name);;
stream = new FileStream();
stream.open(file, FileMode.READ);
var str:String = stream.readUTFBytes(stream.bytesAvailable);
stream.close();
str = str.replace(File.lineEnding, "\n");
contents.text = str;
fileName.text = file.name;
}

]]>
</mx:Script>
<mx:FileSystemDataGrid x="93" y="26" width="700" height="225" id="fdg" change="loadFile()"/>
<mx:Label text="File name:" x="18" y="261" fontWeight="bold"/>
<mx:Label x="19" y="301" text="Contents:" fontWeight="bold"/>
<mx:TextInput x="89" y="259" id="fileName"/>
<mx:TextArea x="89" y="300" id="contents" width="629" height="156"/>
<mx:Label x="10" y="27" text="Current Files" fontWeight="bold"/>
<mx:Button x="726" y="432" label="Save" click="saveFile()" icon="@Embed('assets/images/Save_icon.gif')"/>

</mx:WindowedApplication>

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Topics: Adobe AIR | 31 Comments »

31 Responses to “File and FileStream within AIR”

Daniel Says:
June 7th, 2008 at 12:09 am

Can you save a of stream of a file located in a website? I want to build a multi-file downloader manager. Thanks

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File and FileStream within AIR

31 Responses to “File and FileStream within AIR”

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