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Formatting Syntax

sample_code:json_funcs

JSON functions

I quite often find myself storing JSON representations of objects in files.

In order to simplify the coding slightly, I decided to write a couple of very simple functions.

funcs.js
function writeAsJson(path,obj)
{
    app.WriteFile(path,JSON.stringify(obj));
}
 
function readAsJson(path)
{
    if (app.FileExists(path))
      return JSON.parse(app.ReadFile(path));
    app.ShowPopup(path+" does not exist");
    return undefined;
}

These can be used in an app like this

funcsdemo.js
//Called when application is started.
function OnStart()
{
    //Create a layout with objects vertically centered.
    var lay = app.CreateLayout( "linear", "VCenter,FillXY" );    
 
    //Create a text label and add it to layout.
    var txt = app.CreateText( "Hello" );
    txt.SetTextSize(32);
    lay.AddChild( txt );
    
    //Add layout to app.    
    app.AddLayout( lay );
    test(txt);
}
 
function test(display)
{
   // file to store data 
   var fil="/sdcard/jsontest.txt";
   //build a test object
   var stuff = {"value":1,"name":"one"};
   //save object in a file
   writeAsJson(fil,stuff);
   //get copy of the object from the file
   var newobj = readAsJson(fil);
   //display data from the copy
   display.SetText(newobj.name +" is "+ newobj.value);
}
 
function writeAsJson(path,obj)
{
    app.WriteFile(path,JSON.stringify(obj));
}
 
function readAsJson(path)
{
    if (app.FileExists(path))
      return JSON.parse(app.ReadFile(path));
    app.ShowPopup(path+" does not exist");
    return undefined;
}
sample_code/json_funcs.txt · Last modified: 2015/04/01 07:41 by stevegarman