How to transfer Video (mp4 etc) to IPhone 6/6s/6 plus

Download the latest ITune (mine 12.4.16). Plugin your IPhone, select the phone icon as follows

1. On Summary Page, manually manage music and video

2. On Movies Page (under On My Device), just drag and drop will do.

Gmail Cannot Retrieve Hotmail via POP3

If you cannot retrieve Your Hotmail Account in Your Gmail Account via POP3, and got the following information in gmail

「Authentication failure: unknown user name or bad password. [Error="ProxyNotA...」

that is because All Hotmail accounts are being moved to Office 365 Servers, and that turns off the POP3 service, to reenable it, do the following in Hotmail:

Settings -> Options -> POP and IMAP -> Yes -> SAVE

Viola! You are able to access your Hotmail in Gmail again. 

Btw, Hotmail now allows forwarding email to Gmail too, you can try it in Settings -> Options -> Forwarding. I try it, it works, just that those email is marked by Gmail with "This message may not have been sent by:".

How to embed all fonts in WinEdt for PDF

1. How to include all fonts

If you are using Adobe Acrobat Pro X and above:

Go to Tools>Preflight

Type in Embed in the keyword, you will get Embed fonts under PDF fixups, click Analyse and fix to fix it.

2. How to remove bookmarks

• Remove the \hyperref pacakge in latex
• Print the PDF into another PDF will do.

To check whether all fonts are really embedded, See how to check all fonts are embedded using adobe reader.

How to Run in Cgywin from C#

Use the following code:

public  string runCygwin()
        {

            using (Process p = new Process())
            {

                /*Use the bash shell in cygwin folder*/
                ProcessStartInfo info = new ProcessStartInfo(@"D:\cygwin64\bin\bash");

                /*Put the command to be run in test.bsh*/
                info.Arguments = @"--login ""/cygdrive/D/C_Drive/Desktop/z3-str/tests.bsh""";

                /**Side Info:Content in test.bsh file**/
                string bshContent =
                    "/cygdrive/D/C_Drive/Desktop/z3-str/Z3-str.py -f " +
                    "/cygdrive/D/C_Drive/Desktop/z3-str/tests/Concat001";

                info.RedirectStandardInput = true;
                info.RedirectStandardOutput = true;
                info.UseShellExecute = false;
                p.StartInfo = info;
                p.Start();
                string output = p.StandardOutput.ReadToEnd();
                // process output
                return output;
            }
        }

Some JavaScript Special Scenarios

for (i = 0,j=0; i < 3, j < 2; i++,j++) {
    console.log(i+" "+j)
}

The answer is 0,0 and 1,1 only j<2 applies

function f(a) {
  var a;
  alert(a);
}

f(4);

The answer is 4, since variable in javascript only has local and global scope

Original source

    for (i = 0,j=0; i < 3, j < 2; i++,j++) {

        console.log(i+" "+j)

    }

The answer is 0,0 and 1,1

only `j<2` applies

    function f(a) {

      var a;

      alert(a);

    }

    f(4);

The answer is 4, since variable in javascript only has local and global scope

How to Point GoDaddy Domain to Amazon EC2

You bought a domain from GoDaddy, and you have a server on Amazon EC2, perfect, follow the following easy steps to point Godaddy domain to Amazon EC2 server.

Get Elastic IP from Amazon

On EC2 Management console, click on “Elastic IPs”, click on Allocate New Address

Click Yes, Allocate

You got the New Address assigned.

Right click the elastic IP, click Associate Address.

Choose the instance you are running

Use the default values for all textboxes, Click Associate

Configuration for GoDaddy

Login into your godaddy account, Under the upper menu click “Domains” and then click “Manage my Domains”, Select the domain you would like to change by clicking the link to the domain on the table under “Domain Name” column.

When you see the following screen select DNS Zone File

Click on Edit Record under A(Host), Edit the record to point to the Elastic IP address you have set just now

After that click on Save Changes

 That's it, have fun!

How to Enable FTP on Amazon EC2 (using FileZilla here)

Are you having problems in configuration Amazon EC2 with FTP? No problem, here are the step by step guides.

Configurations on Amazon EC2 console

1.       Click on instance in EC2 console, locate your EC2 instance, and scroll it to the right

2.       Click on the link under Security Groups

3.       Under the Security Group, right click on the item there, and select Edit inbound rules

4.       Add the two rules as follows, and click on save, that’s it.

Configurations on Windows Instance

1.       Login to the Windows instance, click on the Windows button, and key in Windows Firewall

2.       Turn off the Windows Firewall (only for public network settings). Amazon has the configurations to protect you (like those you set in Amazon EC2 console previously).

Configuration of Filezilla Server

1.       Install FileZilla Server

2.       Connect it, retain the orginal setting, and click OK.

3.       Got to Edit > Settings >Passive Mode Settings, set the following. For Use the following IP, key in your Amazon instance IP like 52.34.41.118, and Click OK.

That’s it, you can connect it with your File Zilla Client, using port 21.

How to Create a Free Windows EC2 Instance on Amazon EC2

Want to setup a free Windows EC2 instance on Amazon? Following the following step-by-step guides for doing it.

1.      Go to https://aws.amazon.com/ec2/. Click on Sign in to the Console and login

2.       Click on EC2

3.       Click on Launch Instance to create a new instance

4.       Click on the Windows Server instance and click Select

5.       Select an instance that is free tier eligible and click Review and Launch

6.       Click Launch

7.       When prompt to create key file, create a new one, give a proper name, and download it (by selecting download key pair). Store it properly, we may need to key file in future like for the purpose of enabling remote desktop. Click on Launch Instances, that’s it.

That's it, enjoy your Amazon EC2 Windows instance!

How to move Amazon EC2 instance to new region/availability zone

Say if you have setup your Amazon EC2 instance on US West (Oregon), and you want to move it to Asia Pacific (Singapore)? No problem, follow the following step-by-step guides:

Stop the instance, then right click on the instance and select create image

After the AMI image is created, right click on it and select Copy AMI

Select the Region you want to copy to, give a name and description, and click Copy AMI

After the AMI is copied to new region, click on the Launch button to launch it.

That's it :)

Khan Academy Payment Storing Services

To donate to Khan Academy
https://www.khanacademy.org/donate?amount=3&week=23&treatment=11&utm_source=Sailthru&utm_medium=email&utm_campaign=Blast%204:%20Users%20%28Forward%29&utm_term=all_users_12_3_15

Khan Academy uses Stripe to accept payment.
https://stripe.com/checkout/info

C# vs TypeScript in Visual Studio 2015

Recently, I have coded JavaScript Analysis projects of equivalent functions in both C# and TypeScript in Visual Studio 2015. C Sharp is definitely the winner. Let me explain.

Shortcoming of Typescript compare to C#

1. When usage of myStatement is detected but not imported, Visual Studio will help you import: 
var myStatement1=require("ast/myStatement")
it is incorrect, and need to manually correct back to
var myStatement=require("./ast/myStatement")
C# does not have this problem.

2. Refactoring of class won't affect the naming of usage of class in the other files
e.g., by refactoring the naming myStatement to myStatement1,
it will change from
var myStatement=require("./ast/myStatement")
to
var myStatement=require("./ast/myStatement1")
in classes uses myStatement1, still myStatement is using, C# does not have this problem

3. The Test Explorer needs to parse for a long time, C# is fast.

4. The compiler scanning each typescript file takes quite for a while during starting while C# is very fast

5. C# has windows form for fast UI prototype

6. The Typescript UI sometimes just hang, C# does not have this problem

7. The solution Explorer sometimes left with a big gap after cleaning the js and js.map file, C# does not have this problem

8. Many datastructure are lack off, and difficult to see the contents like Dictionary (from https://github.com/basarat/typescript-collections) in debugging mode. C# does not have this problem

9. The typing in typescript is lazy type, and there is no real class constraint. When you want to use it as a class for OO language like C#, you might create some hidden bugs that you might not aware. You can use C# without such problems.

Shortcoming of C# compare to TypeScript

1. Need to go through Edge.js for running node.js indirectly.

2. Lack of understanding of JavaScript by always coding in C# (Fortunately I have coded quite sometimes in typescript).

3. Actually there is no real shortcoming of C#, it enables fast development without concerning on those superficial stuff, and put real concern in logic.

Meteor Install Path on Windows

It is on
<Your User folder>/AppData/Local/.meteor

But if your problem is you cannot start meteor on Windows in Command Prompt, holds on. You do not need to set the environment with that path. Just RESTART your windows will do. Trust me.

Parsing JavaScript with Esprima vs ANTLR

My original thought is that, the compilation for ANTLR 4 Esmascript (I am using C# target)
(https://github.com/antlr/grammars-v4/blob/master/ecmascript/ECMAScript.g4)
should be faster than Esprima
(http://esprima.org/)

It turns out that it is not.

I use jQuery.Mobile 1.4.2 to experiment:
ANTLR 4 makes use of 1 minute,
while
Esprima only makes use of 100 milliseconds.

Esprima is much faster than ANTLR 4.

Not only I have observed this, I have found some complaints of the speed of ANTLR 4 for JavaScript by other people:
https://groups.google.com/forum/#!msg/antlr-discussion/AUN7BLSDIzo/KG5MQ95Us9gJ

If you are gonna decide which to use, I am here to save your time: choose Esprima.

Produce problems for yourself

Netflix has moving their application to the cloud, leveraging the hardwards in Amazon EC2.
They adopt an architecture call micro service architecture, which breaks normal components in to microservices. These microservices work together to achieve a task.

Microservice could be failed - maybe due to network congestion or simply unavailable. To proactively deal with failure of microservices, they make use of Chaos Monkey in Amazon EC2 that could purposely turn off the microservices. This helps them to see their resilients against failure.

I feel this is a good approach. Rather than waiting for problems, PRODUCE problems for yourself. This allows yourself to have time for fixing or preparing it. Nicely done!

Where is my quora credit?

Well, recently, quora has not discontinued the usage of credit. They have switched to another reward system which is introduced as follows.

====

How the new Ask to Answer system will work:
Ask to Answer requests will no longer cost credits. Anyone can send an Ask to Answer request to anyone else. Ask to Answer requests will be prioritized based on both quality and volume. High priority requests will go directly to the intended recipient and other requests will be aggregated. Prioritization will be based on a number of factors, including: 

1. How many requests the target writer receives and subsequently answers over a period of time.
2. Whether the specific question is tagged with a topic that the writer has expertise in and/or which is listed in the writer's Knows About profile section.
3. Whether the request is sent from a person that the writer follows and/or interacts with regularly.

Regarding notifications about Ask to Answer requests:

• For high priority requests: As before, for each of these requests, you will get individual notifications:

===

Find here for more details.

BB Flashback setting for Youtube Video

Click on Tools>Options in Tools Options

Display (One Time Setting)
Checked the following options:
"Switched off windows graphics effects"
"Disable the "show window contents while dragging option"
"Change resolution when recording" (1280x720)

Use the following options when Exporting Video:
1. Choose AVI
2. Under XviD MPEG-4 Codec, Choose COnfigure [Can download it here:https://www.xvid.com/download/]
3. Click on "Target quantizer"
4. Type 1500 as bit rate (original is 700)
This is one time setting, after setting, if you choose export, just export it without extra changes.

How to vectorize your signature with Inkscape

It’s often useful to add your signature to a Word document instead of manually signing the actual paper with one of those pen thingies. Of course, the easiest method is to just sign a piece of paper, scan it, and insert it as an image. It’s simple to do, but because the scanned image is a bitmap it often looks rubbishy and pixellated when you print it or save it as a PDF.

The solution is to create a vector signature that is guaranteed to look fantastic at every scale. There are lots of methods out there. Here’s mine – it uses free software and is quick to do.

1. Sign a piece of white unlined paper. Choose your best, most representative signature, and scan it (400 dpi or so is usually good enough). Here I’m using the signature of a famous personage that I found online, rather than my own embarrassing scrawl.

2. Change the image to grayscale, and adjust the levels – Auto Levels usually does the trick. You can use Photoshop if you have it, but I use GIMP (GNU Image Manipulation Program), which is free and awesome. Get it from www.gimp.org/downloads. Save the signature as a JPG at high quality (95 or so). It should now look more like this:

3.  Open in the file Inkscape (the open source SVG graphics editor). You can download it from inkscape.org/download – it’s also free and awesome.

4. Resize the page to fit your signature (File menu -> Document Properties -> Fit page to selection):

5. Create a vector version of the signature by using the Trace Bitmap function from the Path menu. You can play around with the settings to fine-tune things, but I find I get good results using a single scan, the brightness cutoff method, thresholds at 0.880 and 0.970, and a 2 colour output. Press OK.

6. Your vector image is now sitting on top of your bitmap image, which you no longer need. Delete it by selecting it, moving it to the side, and pressing the delete key.

7. Resize the page to fit your new vector signature (File menu -> Document Properties -> Fit page to selection).

8. Now save it! From the File menu, choose -> Save As -> Enhanced Metafile (.emf).  There are lots of different vector filetypes you can use (.svg for example), but .emf is a good format for inserting into Word.

Then just insert your signature into Word as a picture, making sure the scale is appropriate (this might involve printing it out a few times to check). Make the image sit “in front of text” if you want to allow it to slightly overlie the typed text.

So that’s it! The result looks very professional, prints really well (it looks jet black on a laser printer!), and withstands infinite zooming when it’s in a PDF:

Writing Clean Code

I accumulated some reference

1. Put good comments on SVN, like what you want to test.  Retain those code that might be used again in the svn, and delete it from your code to keep it clean.
2. When you want to try a new function, a good way is to create a new class. Not create a new function in the class, that will make the class looks too bloat.
3. When the function is working, congrats keep it for the paper. If not, just delete it (note that the version still contain in SVN).
4. People says read code vs write code, times is 10 vs 1. Can't agree on that more. When you create a new class, try a new algorithm, try to record your idea somewhere (written in comment, if too complex a video). so that you can recall it. When you define a function, comments on its purpose and so on.
5. When trying a parameter, define it at a centre place. Cleaning the parameters once in a while.
6. Should have a rule on variable naming. And be consistent on it.
7. Test-driven development will save you lots of time finding bugs, and recreate the same test case. Write unit-test forefront.
8. Define some common libraries when you are coding, and find yourself code the same thing over and over again. Replace all codes with the libraries code for easiness of maintainence.

Ubuntu Packages - How to install gmpy on python

Know about Ubuntu Nickname
It depends on your Version on your Ubuntu, here some version of Ubuntu with their Nickname
Ubuntu 14.10 (Utopic)
Ubuntu 14.04.2 LTS (Trusty)
Ubuntu 12.04.5 LTS (Precise)
Ubuntu 10.04.4 LTS (Lucid)
You can find a more complete reference here
http://releases.ubuntu.com/

Check Ubuntu Version
To check your Ubuntu version
 lsb_release -a

Download your installer according to your Version
I am using precise, so I install it from here
http://packages.ubuntu.com/precise/math/python-gmpy

Search your package here [There is a search engine down the page]:
http://packages.ubuntu.com/

Install the installer
To install a deb package
sudo dpkg -i DEB_PACKAGE
http://askubuntu.com/questions/40779/how-do-i-install-a-deb-file-via-the-command-line

Getting Access Denied when accessing application data folder in Windows 7

Problem:
C:\Users\<ME AS ADMINSTRATOR>\AppData\Local\Application Data is not accessible

Those are junction points : hidden, protected operating system files that are not meant to be accessed by users.
Each one points to a user-accessible folder:

Real path is as follows:

Application Data - C:\Users\{user name}\AppData\Roaming
Cookies - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Cookies
History - C:\Users\{user name}\AppData\Local\Microsoft\Windows\History
Local Settings - C:\Users\{user name}\AppData\Local
My Documents - C:\Users\{user name}\Documents
NetHood - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Network Shortcuts
PrintHood - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Printer Shortcuts
Recent - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Recent
SendTo - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\SendTo
Start Menu - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu
Templates - C:\Users\{user name}\AppData\Roaming
Temporary Internet Files - C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files