I have started with learning adventures of C++, In addition to that I came with learning a new concept of separating interface and implementation. Though an old topic, but thought of posting it doing at Unix.

Normally we  code in a single file for everything, for example consider GradeBook example, we do declare a class, its methods and main() in a single file.

If we take a deeper look into these; Class file is the interface and main() method gives the implementation. So dividing this class and main into two separate files is the concept behind this, thus easing the programmer!

So by doing this we will have 4 files for the GradeBook example;

“GradeBook.h” –> which defines the class and its methods involved

“GradeBook.cpp” –> implementation of the methods;

“main_prog.cpp” –> interface for the programmer.

So in linux, you can now compile the program as

g++ main_prog.cpp GradeBook.cpp

Thats it, from now change the style of Code..

It has been a long time since I made a blog here. Experiencing Learning at ahmedabad for 40 days and back to my civilization, It has been very good with lot of beautiful memories stored inside the box. Initially my training went with a low pace. The irony in training was they were not sure about what they are expecting from me ! Is that they want to test my programming skills ? or my testing skills? The answer is what I could not get even ! Hope my previous batches would atleast have a clarity in what they are doing. Apart from technical sessions, life skills sessions were the best part for many, improving a lot of confidence and self esteem. Facilitators were excellent to say in doing this job Hope I am not reviewing training there, rather just throwing my experience to my blog!!
Anyhow, everything in history is sweet Lets hope for the best being with the technologies of james gosling further in training

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Giving priorities to a task in Ubuntu/Linux

Using “nice” command.
-10 is highest priority
+9 is the lowest priority
0  is the normal priory at which all your tasks will be running; system level tasks run at high priority such as -5
Eg:
nice -n -4 ffmpeg_audio -ss $start_time -t $duration -i $infile -vn -acodec libfaac -ar $SAMPLINGRATE -ab $ABITRATE -ac $CHANNELS -f adts -y ->audiofifo${core}  &
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In Qt, QProcess does not recognise the “|” ( pipe ) symbol when the
process is started. We can solve this by doing like this in linux.
In windows, i am sorry i do not have an answer.
Before starting the QProcess ( say for example proc ) ;
proc->start(“your process name here”), open a file and send the
whole command string to that file ( for example open a file called cmd.sh
and send the command string to cmd.sh) and then start your process as
proc->start(“bash cmd.sh”). This will not produce an error “|” unrecognised
and complete the process because it is a shell script.

*( Normally we use system when | does not work with QProcess, but the problem
here is using system, we can not connect a slot for ProgressBar or Progress-
Bar dialog. So by doing running the process as a script now we can connect
the slot of progress bar. ).

** If any better solutions than the above, please mail to ramvvs@gmail.com.

For all the C programmers using vim – editor,
On highlight syntax using the command ” :syntax on “.

and also auto-completion can be found using “ctags”. ubuntu users can install it using the command ” sudo apt-get install ctags”.

and while programming, type “Ctrl+N” to on the auto-completion where ever it is necessary.

Happy Programming.
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A good article on makefile HowTo’s

http://www.d.umn.edu/~gshute/make/home.html

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K-Jaunty 9.04 is out in the wild now…
www.kubuntu.org

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Simply Superb !!

http://rhettdashwood.com.au/#16575

zembly is a new kind of application development environment that lends the power of the crowd to you, so you can do more, faster. It’s kind of like a wiki, but for applications. Here’s how it works:

http://zembly.com/ui/about#what

A small tutorial on how to design GUI for OpenCV projects with QtCreator.

http://sites.google.com/site/techgeekorg/opencv_qt

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