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--- sample_code:file_service [2015/12/17 17:00]
stevegarman created
+++ sample_code:file_service [2017/08/26 05:22]
@@ Line 1: / Line 1: @@
-===== Web file service =====
-Sample service to keep checking whether a file on a webserver has changed
-==== The code ====
-=== User interface ===
-Create a new DroidScript JavaScript project with the following code in the main .js file
-<code JavaScript mainApp.js>
-var svc;
-//Called when application is started.
-function OnStart()
-{
-    //Create a layout.
-    var lay = app.CreateLayout( "linear", "VCenter,FillXY" );
-    //Create a 'Stop Service' button.
-    var btn = app.CreateButton( "Stop Service", 0.6, -1 );
-    lay.AddChild( btn );
-    btn.SetOnTouch( btn_OnTouchStop );
-    //Add layout to app.
-    app.AddLayout( lay );
-    //Start/connect to our service.
-    svc = app.CreateService( "this","this", OnServiceReady );
-    //uncomment next line to cause your service to start at boot.
-    //app.SetAutoBoot( "Service" );
-}
-//Called after our service has started.
-function OnServiceReady()
-{
-    console.log( "Service Ready" );
-    var running=false;
-    var me=app.GetPackageName()+":droidscript_service";
-    var lst = app.GetRunningServices();
-    for (var key in lst)
-    {
-        if(lst[key].name === me)
-        {
-            console.log(me + " running");
-            break;
-        }
-    }
-}
-function btn_OnTouchStop()
-{
-    //Tell service we are quitting.
-    svc.SendMessage( "quit" );
-    //give the service time to clean up
-    setTimeout(delayedStop,1000);
-}
-function delayedStop()
-{
-    //Stop the service.
-    svc.Stop();
-    // exit main app
-    app.Exit();
-}
-function OnData( isStartUp )
-{
-    var id=app.GetNotifyId();
-    if(id === "servFilx" )
-    {
-        app.Alert("Notification touched") ;
-    }
-}
-</code>
-=== Service.js ===
-Add a second file called Service.js with the following code
-<code JavaScript Service.js>
-var g_ = {lastResponse:""};
-function OnStart()
-{
-    app.ShowPopup("Service started");
-    g_.notify=app.CreateNotification();
-    //Check file
-    SendRequest();
-    //Check again every 30 seconds
-    g_.interval = setInterval(SendRequest,30000);
-}
-//Send an http get request.
-function SendRequest()
-{
-    app.HttpRequest( "GET",
-        "http://sgarman.net",
-        "/downloadable.txt",
-        "",
-        HandleReply,
-        "" );
-}
-//Handle the server's reply
-function HandleReply( error, response )
-{
-    if( !error )
-    {
-        if(g_.lastResponse !== response)
-        {
-           g_.lastResponse = response;
-           g_.notify.SetMessage( response, "File contents", response );
-           g_.notify.Notify("servFilx");
-        } else console.log("same");
-    }
-    else
-    {
-        app.ShowPopup( "Error: " + response );
-    }
-}
-//Called when we get a service message.
-function OnMessage( msg )
-{
-    //Show debug in WiFi IDE.
-    console.log( msg );
-    //Handle messages from main App.
-      if( msg=="quit" )
-      {
-          clearInterval(g_.interval);
-          console.log("loop stopped");
-          g_.notify.Cancel("servFilx");
-      }
-}
-</code>

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