Get Solved

How to write Google App Engine Hello World Web App using Python

admin — Sat, 13 Nov 2010 21:13:20 +0000

Google App Engine is google’s cloud computing platform for developing and hosting web application. Its free up to a certain usage levels of CUP cycles, storage and bandwidth. Google App Engine mainly supports three programming languages Go, Java and Python. This tutorial helps you in setting up the development environment and running the “Hello World” app using Python.

Step 1: Setup Development Environment

You need to download and install followings to setup development environment for Windows.

Step 2: Run Sample App Locally
Run Google App Engine Launcher and copy guestbook demo using Help > Demos > guestbook

Demo application will appear in listing, select the application and click Run to run server. Now click Browse to view application in browser or enter http://localhost:8080/ in browser.

Step 3: Deploy Application on Google App Engine
Log in to Google App Engine using existing Google Account or create new one. Now create new application with available identifier. Now rename the guestbook application to the identifier specified for the application in Google App Engine in app.yaml. You can open app.yaml manually or by clicking Edit after selecting application. Change the first line and add application identifier in place of guestbook. Now click Deploy and provide your Google Account Info to deploy your application Google App Engine.

You can now test it using this url [application_identifier].appspot.com , replace application_identifier by your own application identifier.

For more details and documentations visit http://code.google.com/appengine/docs/python/

http://googleappengine.googlecode.com/files/GoogleAppEngine-1.3.8.msi

How to output JSON using PHP

admin — Sat, 23 Oct 2010 22:37:49 +0000

PHP (version 5 >= 5.2.0, PECL json >= 1.2.0) provides a method json_encode to convert array to string.

$sample = array(
    'name'=&gt;'My Name',
    'email'=&gt;'my_email@example.com'
);
echo json_encode($sample);

The above code will output JSON string, but please NOTE that it is not ready to be considered as JSON. We need to set content type using http headers before printing the JSON string.

<del>header('Content-Type: text/javascript');del>
header('Content-Type: text/javascript');   //strongly agree with Gajus's comment
echo json_encode($sample);

How can I show the full path of directory in command line Freebsd

admin — Sat, 17 Jul 2010 07:46:53 +0000

FreeBSD comes with CSH (C shell) as default., that do not show full path of present working directory. We need to change default shell to BASH (Bourne-again shell) using following command:

# chsh -s /usr/local/bin/bash

You must have BASH in /usr/local/bin/ if not you can get it via ports.

# cd /usr/ports/shells/bash
# make install clean

To see the changes exit the session and login again. Now you can see full path like in my case

[root@freebsd /usr/ports/shells/bash]#

How to increase storage of Android Emulator

admin — Mon, 12 Jul 2010 08:02:49 +0000

First you need to set up Google Android SDK. While creating Android Virtual Device (AVD) you can specify the storage size in SD Card settings. You can specify any size upto 128 GB. Its really helpful if you want to install .apk applications on Emulator. If you do not set size you will get this error while
installing application.

Installation error: INSTALL_FAILED_INSUFFICIENT_STORAGE

Set Storage Size

How to invite others to Google Wave

admin — Mon, 31 May 2010 19:23:19 +0000

You can invite anyone to Google Wave. Google Wave is now open for all. Anyone can signup to Google Wave. Google opened Wave as part 2of Google Labs on 18 May, 2010. Now you can add anyone to new or existing wave even if he is not in your contacts. An invitation will be sent to him to join Google Wave with the description of wave. Just follow these steps.

1. Create a blank wave or use an existing wave

2. Click on ‘+’ sign to add any email address as a participant to wave

3. Enter the email address and click on Invite via Email button

The mentioned email will receive an invitation to join your wave and will automatically become the participant of that particular wave.

Google Android Hello World! with Eclipse

admin — Sat, 29 May 2010 00:00:38 +0000

Your decision to start development on a new platform depends on how easy it is to write a “Hello World”. This tutorial helps you set up the development environment and write “Hello World” in few easy steps. This tutorial assumes that you are already familiar with eclipse and its installation.

Step 1: Set up Eclipse

You can get the latest version of Eclipse from Eclipse Downloads. I am using Eclipse Classic 3.7.2 for windows for this tutorial. If you plan to install 64-bit version, make sure you have latest 64-bit version of Java Development (JDK) installed.

Step 2: Install Android Development Tools (ADT) Plugin

First we need to install Eclipse Plugin named Android Development Tools (ADT).

Its very simple to get this plugin installed. Just Open Eclipse IDE , go to Help>Install New Software…

Install New Software

An Install window will appear with Available softwares. Now enter following link provided by Google in “Work with” field:

https://dl-ssl.google.com/android/eclipse/

Installing ADT Plugin

A new update link will appear put a check mark and click on Next to start installation. After installation the Eclipse IDE would require a restart.

Step 3: Install Google Android SDK

There are two ways to get and install Google Android SDK.

1. Install new SDK (Recomended)

A “Welcome to Android” window appears for SDK configuration when Eclipse restarts after ADT plugin installation (Step 2). You can choose between installing new SDK or use existing. If you choose first option, it will automatically download and configure SDK with Eclipse. You can also get SDK platform (Android APIs) version of your choice. Second option will allow you to locate SDK manually if you already have downloaded it.

Configure SDK

2. Use existing SDKs

If you skip above, you can Download Android SDK in zip format and configure it using preferences window Window > Preferences. Here you select Android from left side bar and set SDK location manually.

Locate SDK

Android SDK Manager Window > Android SDK Manager allows you to get any version of Android Platform any time. You can also get documentation, sources, samples and other stuff here.

Android SDK Manager

Step 4: Create New Android Virtual Device (AVD)

Now we need to create a virtual device to run Android Application on Android Emulator. Go to Window >AVD Manager and select Virtual Devices. Click on New to create a Virtual Device, give it some Name and select Target Android Platform from the drop down list. If you are using 4.x.x version of Android Platform you need to get ARM EBI v7a System Image using Android SDK Manager (see the previous image) to create virtual device.

AVD Manager

Step 5: Create First Android Project

Create a new Project File >> New >> Project , a new wizard will appear to select project type, select Android Project from Android and click Next from the wizard. Now you are to specify Project Name. A directory with this name would be created in yous system. Next is the Package Name the namespace actually where all your code will go. Standard domain style is used for naming. Then Activity Name it is the name of the class that is created by ADT, the plugin we installed. And Application Name that will appear as title of your app. For example my settings are like:

Project Name: AndroidHelloWorld

Package Name: com.getsolved.android

Activity Name: HelloWorld

Application Name: My Hello World App

Now Click on Finsh. If the Finish button is inactive make sure that your are not missing any information discussed above and the Pakage Name follow the domain style.

Step 6: Run the App

Now click on dropdown next to run button, select Run Configurations, Double Click on Android Application, it will create new configuration. At right side just browse the the application you just created and click on Run button. Here you will see your output.

How to disable page jump while clicking on anchore

admin — Fri, 21 May 2010 20:36:16 +0000

Sometimes we want to perform some javascript actions using link but don’t want to jump to another page. We can do this using event object.

For example we have a link say:

Say Hello

Clicking this link will show an alert saying “Hello” but will then move to http://www.example.com/.

To prevent this behavior first we will capture the eventobject and use its method preventDefault():

Say Hello

The above will work fine in Firefox, Chrome, Safari and Opera but does not work in IE instead IE provides a property of event object named returnValue, setting this to false resolves the issue:

Say Hello

Again this works fine with IE, Chrome, Safari, Opera but does not work with Firefox. So the right way is to take care of both i.e. IE and Firefox :

Say Hello

or Simply

Say Hello

<script type="text/javascript">// 
     function foo(e){         alert("Hello");         if(e.preventDefault)            e.preventDefault();         else            e.returnValue = false;     }
// ]]>

Why PHP ini_set() does not work with upload_max_filesize

admin — Fri, 21 Aug 2009 12:21:32 +0000

‘upload_max_filesize’ and ‘post_max_size’ are of type PHP_INI_PERDIR, which means “Entry can be set in php.ini, .htaccess or httpd.conf”. So you can’t set it in your script.

We can set PHP_INI_PERDIR settings in a .htaccess file with ‘php_flag’ like this:

php_flag register_globals off
php_flag magic_quotes_gpc on

How can I get the name of the calling method in PHP

admin — Wed, 15 Apr 2009 07:32:58 +0000

I just fell in need of knowing the name of the method that is currently being called. After having a few minutes of unsuccessful searching i just thought of Late Static Binding and here the PHP Manual helped me.

Just do this inside your method;

echo __CLASS__; // For Class Name

echo __METHOD__; // For Method Name

Good Luck Developers.

How to create Google Gadget Ads

admin — Thu, 12 Mar 2009 18:51:14 +0000

The APIs stuff is just making life easier.

Gadgets are like small applications we play with at different platforms.

Google already have gadgets platform available at iGoogle. Now google introduced Gadget Ads for Adwords. Now you can have more interactive ad campaigns with gadget ads.

For opensocial gadget developers there is nothing to do. New developers needs little effort for.

First thing we need to sort out is the Gadget API.

Currently there are two versions of Gadget API. One is the Legacy and other is a “renamespaced” to gadgets.* an advanced one.

Gadget Ads are currently use the Lagacy Version of Gadget API. The documentation in previous link simplifies all about Gadgets.

Finally go through Gadgets Ads and move ahead to start yours.

Gadget Ads need a little alteration to Gadgets. We can use Gadget Ad Editor for writing, testing, validating and publishing Gadget Ads.