82 | Chapter 4: AIR Mini-Cookbook
function doLoad( )
{
var data = null;file = air.File.applicationStorageDirectory.resolve(
"myFile.txt" );stream = new air.FileStream( );
stream.open( file, air.FileMode.READ );
data = stream.readMultiByte( stream.bytesAvailable,
air.File.systemCharset );
stream.close( );document.getElementById( "editor" ).value = data;
}
</script></head>
<body onload="doLoad( )"><textarea id="editor"></textarea></body>
</html>Asynchronously Reading Text from a File
Problem
You want to read a large amount of text into your application.
Solution
Use asynchronous file APIs to load the text, ensuring applica-
tion execution is not blocked while the file is being loaded.
Discussion
Files containing a large amount of data should be read using
theFileStream.openAsync( )method. This method opens a
file asynchronously for reading or writing and won’t block
additional user input. Asynchronous file operations achieve
this goal by raising events during processing. The result is