Titanium: Image file download via Http

var downloadCoverImage = function(imageUrl){

var imageFileName = 'temp.png';

var fileRepository = Ti.Filesystem.applicationDataDirectory+'../Library/Caches/';

var destFile = fileRepository+imageFileName;  

var f = Titanium.Filesystem.getFile(destFile);

if(f.exists()){

f.deleteFile();

}

var c = Titanium.Network.createHTTPClient();

c.setTimeout(60000);

c.onload = function(e)

{

if( this.status==200 ){

f.write(this.responseData);

}

};

c.ondatastream = function(e)

{

Ti.API.info('Saving image - PROGRESS: ' + e.progress);

};

c.onerror = function(e)

{

Ti.API.info('error:'+e.error);

var errorDialog = Ti.UI.createAlertDialog({title:'錯誤', message:'無法連接伺服器,請檢查網絡連線'});

errorDialog.show();

errorDialog.addEventListener('click', function(e){

if(c) c.abort();

win.close();

});

};

c.open('GET',imageUrl);

c.send();

};