開発スタッフがアプリ関連の最新技術やニュースをご紹介します。

Today, I would like to share about using netcat to send messages. Let’s take a look.

Netcat is a command line utility tool for performing operations about TCP or UDP and also known as a powerful networking tool. It is mostly used for port scanning, transfering data and troubleshooting a server but in this blog, I will share just about messaging using netcat.

You can install netcat by the following command in debian based operating systems. You will find other installation methods for other operating systems by googling.

sudo apt-get install netcat

To create a messaging service with netcat, run the following command in the terminal to listen on a port of the server.

// Ross

nc -lvp 2000

And on the other system, run the following command to connect the chat server.

// Rachel

nc {ip_of_Ross} 2000

Now Ross and Rachel can send message to each other.

But the messaging style is so simple that can’t know obviously who sent the message. For that, you can add prepending name to the chat by using mawk.

// Ross

mawk -W interactive '$0="Ross: "$0' | nc -l -v -p 2000

// Rachel

mawk -W interactive '$0="Rachel: "$0' | nc {ip_of_Ross} 2000

There we go. It is cool, isn’t it.

For details of ‘nc’ usage, run ‘man nc’ in terminal.

This is all for now. Hope you enjoy that.

By Asahi

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1: 形状を変更する

FloatingActionButton( 
     shape: BeveledRectangleBorder(
          borderRadius: BorderRadius.zero
     ),
)

2:サイズを変更する

幅と高さは自由に調整できます。

SizedBox( 
    height:100,
    width:100,
    child:FloatingActionButton( 
       child: Icon(Icons.add), 
       onPressed: (){
            print("Button is pressed.");
        },
     ),
),

3:位置を変更する

場所を変更するには、ScaffoldのfloatingActionButtonLocationプロパティを使用します。

Scaffold(
    floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat
)

全部を纏めて、プロジェクトビルド した時

結果

return Scaffold(
        floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
        floatingActionButton: SizedBox(
          height: 100,
          width: 100,
          child: FloatingActionButton(
            child: Icon(Icons.add), 
            shape: BeveledRectangleBorder(borderRadius: BorderRadius.zero),
            onPressed: () {
              print("Button is pressed.");
            },
          ),
        ),
        backgroundColor: Colors.blue[100], 
        appBar: AppBar(
          title: Text("Floating Action Button"), 
          backgroundColor: Colors.redAccent, 
        ),
        body: Center(child: Text("Floating Action Button")));

金曜担当 – Ami

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今回はさまざまなプログラミング言語やツールで活用できる正規表現の記号を紹介します。
本記事は前回の「正規表現基礎(2)」の続きです。

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Instagram announced it is expanding its choice of time management tools with the launch of a new feature called ‘Quiet Mode’. This feature helps users to have a break from the app by silencing incoming notifications, automatically replying to direct messages, and letting friends know they are not using the app by setting their status to ‘Quiet Mode’.

Quiet Mode joins a handful of other screen time management tools Instagram now offers, including daily time spent widgets that let people track their app usage and send each other alerts, set “take a break” reminders break” after individual app sessions extend beyond a certain amount of time and various tools to pause, snooze, and unfollow pages, groups, and people to help further reduce engagement with content that is addictive.

The idea is not just a tool that encourages users to take a break. Instead, it focuses on the real-world impacts that accompany trying to step away from an app you use regularly, and where others expect you to be available.

According to Instagram, teens will be prompted to enable the feature when they spend a “certain” amount of time on Instagram at night, but quiet mode will be available to all users.

Quiet Mode will initially be available to users in the US, UK, Ireland, Canada, Australia, and New Zealand. Instagram says it hopes to expand to more countries soon.

Yuuma

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1 PokéAPI

子供の時、学校が終わった後学校から家まで歩きながら、ポケモンGOをやっていました。だから、これはお気に入りのひとつです。

PokéAPIは、ポケモンの情報（移動、タイプ、能力）をたくさん持っています。

2. GIPHY

GIPHYは世界最大のGIFとビデオライブラリで、強力な機能のスイートをカスタマイズできます。🎆🎢🎉

3 Breaking Bad

もしBreaking Badのファンなら、それについて確認すれば、いいと思います。名言やキャラクター、エピソードを取得できます。

参考画像 – google*

金曜担当 – Ami

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