Jul 8 2013

Greesemonkey Script for filtering Stackoverflow Bounty Page

This specific content was written 13 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

I’m a big fan of stackoverflow and many times surf the featured page that has many questions that have an additional bounty attached.
One of the things though that I want to do is quickly find the questions with zero answers that have not received attention due to one reason or another (e.g. very difficult).

For the specific URL: http://stackoverflow.com/questions?sort=featured , Below a greesemonkey script just for that!

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May 15 2013

Why Java passes objects as references passed by value

This specific content was written 13 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

I came across a question recently on stackoverflow that was very enlightening and proves how objects are actually passed in java. It was quite an interesting discovery!

I am quoting from here

 

Java is always pass-by-value. The difficult thing can be to understand that Java passes objects as references passed by value.

It goes like this:

public void foo(Dog d) {
  d.name.equals("Max"); // true
  d = new Dog("Fifi");
  d.name.equals("Fifi"); // true
}

Dog aDog = new Dog("Max");
foo(aDog);
aDog.name.equals("Max"); // true

In this example aDog.name will still be “Max”. “d” is not overwritten in the function as the object reference is passed by value.

Likewise:

public void foo(Dog d) {
  d.name.equals("Max"); // true
  d.setname("Fifi");
}

Dog aDog = new Dog("Max");
foo(aDog);
aDog.name.equals("Fifi"); // true

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Apr 17 2013

SO:Removing duplicate rows from data pulled from db in java

This specific content was written 13 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

I’ve become an active member of stack overflow, both answering and making questions.
It’s amazing, there’s a whole community there that I hadn’t noticed before.
As I have not had time to post new items, I will be borrowing my answers to stackoverflow questions and re posting them here.


User Question:

So here’s my question. I have a giant text file of data and I need to input all of this data into a mySQL database fast through obviously using a java program. My only problem is that, the data is identified by a certain ID. Some of these ID’s have duplicates and contain all the same info as eachother. I would like to remove all of these for sorting purposes and clarity sake.

What would be the best way to go about this? If anyone could help I’d appreciate it

Answer:

clones/duplicates
clones/duplicates

While reading the data have a hashmap or hashset. check if the id exists in the hasmap/hashset and if so continue. otherwise enter in set/map and insert.

An aside: The difference between hashmap and hashset is hashset only takes values while hashmap takes key values. However, Hashset itself uses a hashmap within memory and just inserts a dummy object for values. See: Differences between HashMap and Hashtable?

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Feb 14 2013

Bring Misplaced Off-Screen Windows Back to Your Desktop (if all else fails)

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.
Move Off screen Windows Easily
Move Off screen Windows Easily

I use a dual monitor setup with my laptop, but the annoyance is when I switch to using only the laptop screen and certain windows are stuck out of the screen. I read various posts about this and most deal with right clicking the taskbar and trying out “move” or “cascade”.

I noticed the “Move” method is not available on windows 7 when you are using the classic theme, and various other methods failed so I’m posting my “IF all else fails” alternative.

Download the WinLister application from here

Run WinLister as Administrator and select the window you wish to

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Jan 31 2013

Opening multiple VLC windows for different RTSP Streams from AXIS camera

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

Today I wanted to open asap 4 RTSP streams using VLC.
I ended up copying and pasting the following in the command prompt caused 4 background instances of VLC to appear and read from 4 different AXIS cameras.


"C:Program Files (x86)VideoLANVLCvlc.exe" -vvv "rtsp://username:password@IP_ADDRESS:PORT/axis-media/media.amp?videocodec=h264&resolution=768x576&compression=30&fps=10&textstring=cam1&text=1&textpos=1"&

"C:Program Files (x86)VideoLANVLCvlc.exe" -vvv "rtsp://username:password@IP_ADDRESS:PORT/axis-media/media.amp?videocodec=h264&resolution=768x576&compression=30&fps=10&textstring=cam2&text=2&textpos=1"&

"C:Program Files (x86)VideoLANVLCvlc.exe" -vvv "rtsp://username:password@IP_ADDRESS:PORT/axis-media/media.amp?videocodec=h264&resolution=768x576&compression=30&fps=10&textstring=cam3&text=3&textpos=1"&

"C:Program Files (x86)VideoLANVLCvlc.exe" -vvv "rtsp://username:password@IP_ADDRESS:PORT/axis-media/media.amp?videocodec=h264&resolution=768x576&compression=30&fps=10&textstring=cam4&text=4&textpos=1"&

echo done

Enjoy!

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Jan 30 2013

Calculating required upload bandwidth for Axis IP Camera

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.
SVGA_10FPS_StationWhat must someone consider for calculating required bandwidth for IP cameras?

It is not only resolution, but also FPS, the amount of activity (motion), and the compression level which determine the bandwidth required.

Obviously, when the frame doesn’t have so much traffic there is less data to transfer (due to the compression in H.264).
There is a very nice Axis Design tool which estimates bandwidth based on various scenario videos located at:
Within the tool you can select from various videos (“Scenario Combobox”) and view how the bandwidth requirements change based on the activity.
The train station is the extreme example with movement everywhere.The amount of activity within the video makes a tremendous difference as well as the compression, so you need to test reading at multiple compression to see what is acceptable 
in order to not undermine results especially if you are using video analytics software. 

Also, instead of viewing using RTSP over HTTP it is optimal to view through VLC and RTSP using the axis rtsp api.
The API is available at:  ( http://www.axis.com/files/manuals/RTSP_API_2_01.pdf – page  PDF 14 – parameter specification ) and specifies options to build URLs such as:
rtsp://IP:PORT/axis-media/media.amp?videocodec=h264&resolution=768×576&compression=10

 

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Jan 22 2013

XDebug in XAMPP and Netbeans

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

Having written a lot of PHP code for a project using Notepad++, I got tired with the limitations of not having an IDE containing a debugger, and refactoring tools.

Quick post mostly for myself to have a reference on how to setup XDEBUG (which was quite easy using XAMPP).
If you don’t want to go the long road download the full version of XAMPP here 🙂

1) First off as the DLL is already located it does not need to be downloaded.
2) Open php.ini and make the following edits:

A) Uncomment the line zend_extension = “Somethingphp_xdebug.dll”
B) Uncomment the variables and set them as specified by netbeans …

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Jan 22 2013

2012 in review

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog.

Here’s an excerpt:

600 people reached the top of Mt. Everest in 2012. This blog got about 3,800 views in 2012. If every person who reached the top of Mt. Everest viewed this blog, it would have taken 6 years to get that many views.

Click here to see the complete report.

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Jan 22 2013

Running Java on Fujitsu Q700 NAS Server

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

NAS+JavaSmall post how I got java to work on Q700 NAS Server.
If you check the Datasheet for the server ( here ), you will see the Processor is a  Marvell 6281 1.2 GHz  . Essentially, this is a ARM 5 processor.
Based on some instructions from here , I navigated to http://www.oracle.com/technetwork/java/javase/downloads/embedded-jsp-135769.html ,
and downloaded the version ARMv5 Linux – Headless EABI, SoftFP, Little Endian2 .

All that remained was untar-ing the content onto the NAS, and executing  java – version.
JavaEmbedded

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Jan 20 2013

How to move “Virtualbox VMs” files

This specific content was written 14 years ago. Please keep this in mind as it may be outdated and not adhering to best-practices.

I came across a situation where my VMs were taking too much space from my C drive. The instructions below are from the forum post here.

“The most common I found is to remove your VMs from the manager without deleting the files. “Remove the VMs from the manager without deleting the files. You can then move the entire VM folder (not just the bare VDIs) to a new location, before adding them back to the manager.”

Here’s how I did it… Use these instructions at your own risks ;-)

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