• Some online dating apps have been working on implementing new features to prevent catfishing—other companies are even producing AI intelligence to fend against it.
• The revenue from this industry and its frequency of use are astronomical.
• Even if the person you’re meeting volunteers to pick you up, avoid getting into a vehicle with someone you don’t know and trust, especially if it’s the first meeting.
• OkCupidwas created in 2004 by a group of friends from Harvard University.

When you engage in social events where you’re likely to meet new people, the pool of those who are single and looking is much smaller than when you’re on an app or dating site where everyone is in the same boat as you. Research shows, however, there are negative side effects of online dating, particularly for young women. People cite the obvious reasons for being on dating apps, such as seeking a long-term partner or a sexual encounter; the split is fairly even.

The post The Ultimate Guide To Online Dating first appeared on Mahol Dot Org.

How to Capture the Output of a Linux Shell Command in C

If you google about how to redirect your shell output in C program, you will find couple of answers. There are few ways like using  freopen (“/dev/tty“, “a”, stdout) and playing around with ‘stdout’ file descriptor.

Other common approach is using ‘system’ command. The ‘system’ command executes the command.

int system (const char* command);

 With ‘system‘ function returns an integer indicating success or failure, but not the actual output of the string or command. This is useful when you do not need to stream the command output to your program.

When you need to re-direct command output to your program then you will need to use ‘popen’

popen - pipe to/from shell

FILE *popen(const char *command, const char *type);int pclose(FILE *stream);
Typically usage is:

     FILE *fp;
     char *command;

     /* command contains the command string (a character array) */

     /* If you want to read output from command */
     fp = popen(command,"r"); 
          /* read output from command */
           fscanf(fp,....);   /* or other STDIO input functions */
     
     fclose(fp);

     /* If you want to send input to command */
     fp = popen(command,"w"); 
          /* write to command */
           fprintf(fp,....);   /* or other STDIO output functions */
     
     fclose(fp);

The program cannot both send input to the command and read its output. You pass the command as a string to ‘popen’ function.

How to Capture GPS NMEA Output in C Program

Here is sample program using ‘popen’ to do this. What it does is creates a result buffer, opens up a read-only stream, runs the command, and captures the output, stuffs it into the buffer, then returns it as a string.

#include <stdio.h>
#include <stdlib.h>


int main( int argc, char *argv[] )
{

  FILE *fp;
  int status;
  char result[512];
  int i=0;
  /* Open the command for reading. */
  fp = popen("gpspipe -r -x 5 | grep '$GPGGA'", "r");
  if (fp == NULL) {
    printf("Failed to run command\n" );
    exit;
  }
  for(i=0;i<4;i++)
  {
  /* Read the output a line at a time - output it. */
  if (fgets(result, sizeof(result), fp) != NULL) {
    printf("%s", result);
  }

  else printf("no output \n");
  }
  /* close */
  pclose(fp);

  return 0;
}

This program uses ‘gpsd’ client programs to redirect NMEA output to command line. For more on how to install and test with ‘gpsd’ refer this post.

You should test the output of command first on command line. As you know making work GPS module is tricky.

The post How To Capture GPS NMEA Output in C Program first appeared on Mahol Dot Org.

Dynamic polymorphism which is evaluated at run time not at compile time so we are sure that errors are not known before execution. Like e.g Explicit casting is evaluated at run time.

object test = new Manager();
//You cant cast test to a Department!
Department dept= (Department) test;

So how can we safely use such casting and handle exception

try
{ 
Department dept = (Department) test;
}
catch(InvalidCastException ex)
{ 
...
}

Above code is about handling exception but how about doing some more logical coding in the failed case, coding into catch not good example.

We can determine whether the given type is compatible with another using ‘as’. Compatibility check will return null value.

Using is Keyword
Unlike as keyword is keyword returns false if compatibility between objects or casting failed.

void(Employee emp)
{
if(emp is Department)
     Console.WriteLine("Sorry, emp is not Department..");
}

Here we are checking runtime what incoming base class reference is actually pointing in memory. So we are not using try catch as well here to wrap the casting.

Happy programming..Number of View :9174

The post How to use IS and AS keywords in C# first appeared on Mahol Dot Org.

Lets say you create interface of Cycle

Interface ICycle
{

void Handle(); 
void Wheels(); 
}

Inheriting class

class AtlasCycle: ICycle
{
void ResizableHandle()
{...
}
void fourDiaWheels()
{....
}
}

Above cycle skeleton can be used to derive any brand of bicycle with different feature values.

• Interface has by default all fields, properties and methods Public. But you can have internally private and use it appropriately inside interface.

• One which is public has to be implemented in inheriting class So it better than having base class.

• Class can inherit as many as interfaces So structures can also use interfaces.

• Interface does not have implementation only declarations.

• It is highly used to design architecture. So it is architecture job to define what to be exposed and what not to client.

Happy Programming..Number of View :8955

The post Interface Programming tool A Concept first appeared on Mahol Dot Org.

DATA TYPES

Object Types: It is parent type of all other known types in .Net. If used as an argument in Method call then passing any type to method will cause late binding assignment to that argument.
Value and Reference Type: This type categorized on the storage of value in memory. Value Type are stored in Stack. e.g type INT, DOUBLE.
Reference types are stored in heap. e.g Type String and Object.
Converting value type into reference type called as Boxing and reverse is UnBoxing.

DECLARATION
C# allows simple and component variable declaration.

ENUMRATION
It is declared as set which are mapped to integers. This type allows us to have series which can have their mapping to unique integer value inside the set.

public enum EmployeeRole{ Trainee=0, Programmer=1, Sr Programmer=2}

Arrays: This type holds list.
e.g

int [] intArray;

OPERATORS Representing symbols for operations.
e.g Arithmetic[+, _, +], Logical[||, &&], String Concatenate[&], Increment and Decrement[+=], Comparison[<=, =>], Cast[()] etc..

FLOW CONTROL Controls the flow of your programme. e.g conditional statement [if ..else, switch], loops[while, do..while, for, foreach], functions.

CLASSES Class is type which includes all types, members, methods etc. It has visibility, its lifetime, relation, inheritance, method overloading..

REFLECTION Dynamically gather information of underlined type in late bound fashion. e.g Attributes allows to attach metadata to class and its members.

INTEROPERABILITY This feature facilitates to work with other programming language and API.
COM INTEROPERABILITY: This allows to integrate legacy components with .Net classes.
INVOKING WINDOWS API: This is same as VB6 feature to invoke and use windows API. Reference dll and create wrapper functions.

[sysimport(dll="user32.dll")]
private static extern int MessageBoxA(int hwind, string Message, string caption, int Type);

STRUCTURED ERROR HANDLING This is way of handling error by blocking code. e.g

Try
{}
Catch(){}
Finally{}

C# PREPROCESSOR This feature allows programmer to do better programming like expanding code, collapsing code…

Happy programming..Number of View :7955

The post C# Language Features OOPS .NET first appeared on Mahol Dot Org.

For onenote you can work offline or work online.

Features
Onenote has text, Image, video , audio capturing features.
You can create your own template and customize it.
Can share notes with others.
You can use notebook multiple computers.

How to Use OneNote?
You need to install Office 2007 for better features.Latest you have Office 2013 Onenote.
Then you can start working with OneNote right away. Detail information can be found at office site of microsoft
Number of View :3451

The post Microsoft office 2007 OneNote How to use OneNote? first appeared on Mahol Dot Org.

So what is HDInsight?

Haddop Insight is Apache hadoop service available on azure cloud. This is also dealing with big data which is nothing but managing data, enriching, and refining data virtually. Big data can deal data for personnel, organization and global. HDInsight provides HDFS and Mapreduce softwares available in azure in better way. It has Hive console and Javascript console which we can use for configuring, execution of Hadoop jobs.

So now you must have understood that to work with HDInsight you need Winodws azure storage account and pay for it so that you get maximum feature use.

You can learn more about it http://www.windowsazure.com/en-us/manage/services/hdinsight/

More about Big data

Happy Learning..Number of View :3558

The post Buzz Windows Azure HDInsight Service Hadoop Big Data first appeared on Mahol Dot Org.

This is all above comes in PageLifeCycle and we can find many articles on that. I have small understanding on very important thing and I would like share..

When Post Back happens or any server side event fired their are major event which plays role to retain data of view state.
LoadPostBackData – This function is only applicable for Postback. When the page is given to asp.net engine with all markup asp.net engine calls for several functions to complete the server side load.
Browser on event firing or postback will pass on the values to ASP.NET engine using HTTP POST header which actually has _VIEWSTATE.
IPostBackDataHandler interface will take care of calling LoadPostdata function for all the server controls for which loading view state is applicable.All listed controls in IPostBackDataHandler will have call for LoadPostdata () method like textbox, listbox. So here we can see that its not viewstate which is only responsible for loading user input to controls.

Page Load – In this event the load view state happens along with post back data.

Save View State -In this stage Page class construct View State for page which has to be maintained across post back. It is called according to the hierarchy defined in Page Instantiation for all the controls(stored in the WINDOWS\Microsoft.NET\Framework\version\Temporary ASP.NET Files).

Very nice explanation of page life cycle and role of view state is written here

Happy programming..Number of View :3333

The post ViewState and Server Controls ASP.NET PageLifeCycle first appeared on Mahol Dot Org.

Open Visual Studio -> New Project->Select c# and then Select Console Application

Name project – ObjectLifeCycle

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ObjectLifeCycle
{
    public class log
    {
        public Int32 i;

        public void TestA(log obj)
        {
            obj.i = 100;
        }

        public void TestB(log test)
        {
            test = new log();
            test.i = 1000;
        }
    }
    
    class Program
    {
        static void Main(string[] args)
        {
            log o = new log();
            o.i = 10;
            Console.WriteLine(o.i.ToString());

            o.TestA(o);
            Console.WriteLine(o.i.ToString());

            o.TestB(o);
            Console.WriteLine(o.i.ToString());          
            
        }
    }
}

You can directly paste this code in your .cs file and execute the code , you should see output as followed
10
100
100

So the object of class log which has only one variable in it and methods which has argument passed as its own object is having different scope in different assignment.

In Main Method object is initialized with values first time so first writeline statement gives 10.
Second method call TestA with object o is passed. Inside the method their is just reassign of value to int as 100 so the value 10 is replaced to 100 for object o which is still having same reference.

Third method call TestB in which again object o is passed which had value of int as 100. Now inside method new object initialization happens that means new object o for which int value is 1000.
Now you must be wondering third value is not 1000, this is because TestB created new object with new memory allocation. So test object scope finished ones it came out of the method. Since the Writeline method is calling value available in object o it has given 100.

Lets do one more change on line 35

o.i = o.TestB(o);

In above case what is happening is we are copying return value of int from TestB method and assign it to object o.i int value. of course TestB return type has to be changed from void to int.

It should return
10
100
1000

For more details http://msdn.microsoft.com/en-us/library/fa0ab757%28v=vs.100%29.aspx

Happy programming….

Number of View :3213

The post Understanding the Object Oriented Programming first appeared on Mahol Dot Org.

To develop ASP.NET application on VS2010 follow steps as below
1) Open VS 2010 -> File Menu -> New -> Project
2) Under Project window you can see various language and options, I am selecting c# and then Cloud here you see at right Panel is Windows Azure Cloud Service

VS 2010- Project- Cloud

3) Give name and location of project to save.
4) Next step it will open window to select the project type

Select Cloud Project Type

But why is project type with Role like Web, Worker and VM? In short they are nothing but your Web Configuration role. Like you want use IIS for application, you want to run it locally with worker process or using VM… you can find good explanation in msdn,
Have patience here it takes time to get your code files service files to be generated.

4) Now you can do implementation in your project which is of WebRole type.
5) Ones you are ready for hosting of course we will do it on windows azure, select WebRole Project Properties -> Publish to Windows Azure
6) Now here your Windows Azure journey starts , Create Login in if you have already use it. When you try for Trial you still need to provide your bank account details. When you come to Publish First windows will be asking Import credentials which you have, If you have not saved your Credentials from Windows azure login save it by choosing Sign in to download credentials.

Click Next.
7) Here you need to fill correct details. Read about Windows azure before you do settings in publish.

As per above image you need to specify Cloud Service(Select Create New from drop-down and give name and location) Name which we give here will become your URL. Provide all other details as well.
8) Go to Advanced Setting Tab and create New Storage Account.
9)Click on Publish.. and Wait for Status in task bar of your project as completed.
This time here it will perform connection with Windows Azure and create your application.
10) Ones you have no failure and Status shows as Completed you can click the URL given in output results and browse.

few steps are different than the videos given by msdn.

Happy Programming..
Number of View :6752

The post .Net Application With Windows Azure 1.8 first appeared on Mahol Dot Org.