How to clean uninstall Xcode on Mac

Many times it happens that you update your MacOS and then some new update comes up for the Xcode version and there is a backwards compatibility issue. Then you go to the App Store on your Mac to update the Xcode and Bam! You end up wasting hours because the installation gets stuck. It keeps showing installing for hours. If you force shutdown your MacOS and restart, then again the same story.

This time it happened with me again after I updated MacOS Catalina and installation of Xcode 11.3 just doesn’t end. Stopping in App Store doesn’t work.

Another way is, going to the Launchpad and holding down the alt/option key till all the icons start to jiggle. Then click on the x icon and you’ll be prompted to confirm to delete the Xcode App. Well, this also didn’t work for me. Then restart your Mac to move to the next steps.

Go to the Applications folder and find the Xcode App, right-click on it and move it to Trash/Bin. Empty the Trash/Bin.

For newer versions of Xcode, this step should be sufficient. You can go ahead and re-install Xcode from the App Store.

Removing from the Terminal

You need to run the following command in order to completely remove Xcode:

sudo /Developer/Library/uninstall-devtools --mode=all

The above command requires the admin password for sudo. If you get the error that the above command not found, then it probably doesn’t work for the newer versions of Xcode.

The following folders are cleared with complete uninstallation of Xcode. You might need to consider backing up the data in case you have Projects in the Developer folder and certain preferences to preserve in case you’re reinstalling.

  • /Applications/Xcode.app
  • /Library/Preferences/com.apple.dt.Xcode.plist
  • ~/Library/Preferences/com.apple.dt.Xcode.plist
  • ~/Library/Caches/com.apple.dt.Xcode
  • ~/Library/Application Support/Xcode
  • ~/Library/Developer/Xcode
  • ~/Library/Developer/CoreSimulator

Remove the files at ~/Library/Caches/com.apple.dt.Xcode is basically clearing the cache.

Share your experience on what worked for you to make this post better.

How to Count number of e-mails in mailbox using PowerShell

First, you need to access the mailbox on the Microsoft Exchange Server and then get the mailbox statistics for the count of e-mails. The credentials you use should have admin access on the Server to be able to access the mailbox.

The following script uses some credentials stored in a file on the machine where the script is running and connects to a Session on the Microsoft Exchange Server:

$un = “admin@somedomain.com”
$Pass = cat “C:\Data\Securestring.txt” | ConvertTo-SecureString
$Credentials = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $Un, $Pass

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://{servername}/PowerShell/ -Authentication Kerberos -Credential $Credentials

Import-PSSession $Session -DisableNameChecking

$data=Get-MailboxFolderStatistics -Identity "somemail@somedomain.com" -FolderScope inbox | ?{$_.folderpath -eq "/inbox"} | select ItemsInFolder 

Write-Host $data.ItemsInFolder

You can further use this data item to mail it to the Admins for Operations purpose.

To know how to send e-mail in PowerShell, check out this post here.

Configure Reverse Proxy in IIS with URL Rewrite

Reverse Proxy is an intermediate Server that might be exposed to the Internet that can help secure your incoming traffic from the Client and forwarding the request to a back-end service that might be on a Private network. This returns the response back to the Client and hides your Web Server from the Outside world.

You need the following IIS extensions for configuring IIS Reverse Proxy:

URL Rewrite:
https://www.iis.net/downloads/microsoft/url-rewrite

Application Request Routing:
https://www.iis.net/downloads/microsoft/application-request-routing

Now add the following URL Rewrite rule:

You’ll be prompted to enable the ARR to further enable Proxy functionality. Click on OK.

In the above window, you can also provide the Outbound configuration to map the response URLs From Private URL To Public URL conversions mapping.

For this example, accessing http://localhost:8087 will simply redirect to http://localhost:8084 and serve the Client.

Use package react-svg-radar-chart to create Radar chart ReactJS

Create a basic ReactJS App using the create-react-app Post here.

Our final aim is to generate a Radar Chart using the npmjs package react-svg-radar-chart. Also, the dot markings on the chart should be able to show the current index and key, values on the chart on Hover as shown below.

The code is available in my Github profile.

Install the Package in your Project by running the following command in the Terminal:

npm install react-svg-radar-chart

Replace the code for the index.js file as shown below:

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(<App />, document.getElementById('root'));

Create the App.js file for the App component and add the below code:

import React, { Component } from "react";
import MyComp from "./MyComp";
import MyRadarComp from "./MyRadarComp";

export default class App extends Component {
    render() {
        return (
          <div className="App">
            <MyRadarComp />
          </div>
        );
      }
}

Create MyRadarComp.js file and add the below code:

import React from 'react';
 
import RadarChart from 'react-svg-radar-chart';
import 'react-svg-radar-chart/build/css/index.css'
 
export default class MyRadarComp extends React.Component {
  render() {
    const tooltipstyle = {
        position: 'relative',
        display: 'inline-block',
        borderBottom: '1px dotted black'
    }

    const tooltiptextstyle = {
        visibility: 'hidden',
        width: '220px',
        backgroundColor: 'black',
        color: '#fff',
        textAlign: 'center',
        borderRadius: '6px',
        padding: '5px 0',
    
        /* Position the tooltip */
        position: 'absolute',
        zIndex: '1',
    }

 	 const data = [
      {
        data: {
          battery: 0.5,
          design: .7,
          useful: 0.985,
          speed: 0.57,
          weight: 0.7
        },
        meta: { color: 'blue' }
      },
      {
        data: {
          battery: 0.6,
          design: .85,
          useful: 0.5,
          speed: 0.6,
          weight: 0.7
        },
        meta: { color: 'red' }
      },
      {
            data: {
              battery: 0.7,
              design: .8,
              useful: 0.9,
              speed: 0.67,
              weight: 0.8
            },
            meta: { color: '#58FCEC' }
        }
    ];
 
    const captions = {
      // columns
      battery: 'Battery Capacity',
      design: 'Design',
      useful: 'Usefulness',
      speed: 'Speed',
      weight: 'Weight'
    };

    const noSmoothing = points => {
        let d = 'M' + points[0][0].toFixed(4) + ',' + points[0][1].toFixed(4);
        for (let i = 1; i < points.length; i++) {
          d += 'L' + points[i][0].toFixed(4) + ',' + points[i][1].toFixed(4);
        }
        return d + 'z';
      };
       
      const defaultOptions = {
        size: 200,
        axes: true, // show axes?
        scales: 3, // show scale circles?
        captions: true, // show captions?
        captionMargin: 10,
        dots: true, // show dots?
        zoomDistance: 1.2, // where on the axes are the captions?
        setViewBox: (options) => `-${options.captionMargin} 0 ${options.size + options.captionMargin * 2} ${options.size}`, // custom viewBox ?
        smoothing: noSmoothing, // shape smoothing function
        axisProps: () => ({ className: 'axis' }),
        scaleProps: () => ({ className: 'scale', fill: 'none' }),
        shapeProps: () => ({ className: 'shape' }),
        captionProps: () => ({
          className: 'caption',
          textAnchor: 'middle',
          fontSize: 10,
          fontFamily: 'sans-serif'
        }),
        dotProps: () => ({
          className: 'dot',
          mouseEnter: (dot) => { 
              document.getElementById("tooltip").innerText = "index: " + dot.idx + ", key: " + dot.key + ", value: " + dot.value;
              document.getElementById("tooltip").style.visibility = "visible";
            },
          mouseLeave: (dot) => { 
              document.getElementById("tooltip").innerText = "";
              document.getElementById("tooltip").style.visibility = "hidden";
            }
        })
      };
 
    return (
      <div>
        <RadarChart
            captions={{
              // columns
              battery: 'Battery Capacity',
              design: 'Design',
              useful: 'Usefulness',
              speed: 'Speed',
              weight: 'Weight'
            }}
            data={data}
            size={400}
            options={defaultOptions}
          />
          <div id="divtool" style={tooltipstyle}><label id="tooltip" style={tooltiptextstyle}></label></div>
        </div>
    );
  }
}

Run the Project:

npm start

A few points about the MyRadarComp component:

  1. The code is taken from the npmjs package sample provided in the package description.
  2. I’ve modified the css a bit to show the dots on the chart and also show the values on the Hover event of the dots.
  3. The caption labels and the data property names should match in order to correctly display the data.

Setup Github Repo from Visual Studio Code

  1. Create the Project or directory on your file system. My local folder is called formik-sample. You can also create using the create-react-app Post here for a sample ReactJS App.
  2. Create a repository on Github. I’ve named it sample-form-reactjs.
  3. Click on Clone or Download. Copy the SSH link.
  4. Open the local folder in VS Code as created in Step 1.
  5. In the Terminal Window in VS Code, type the following commands:
  6. git config –global user.name someid
  7. git clone git@github.com:someid/sample-form-reactjs.git
  8. After this is done, just follow the same steps for git stage/commit/push etc.

For # 3:

However, if Step 5. gives error like below:

Check your network firewall settings if you’re doing it from Office. Try it out from your home and it should work.

Also, you can clone git@github which is SSH version but for that you have generate ssh keys and have to set it in local environment and if you don’t want to set up that then just use https version in the above clone command.

If you face branch related errors, since you might have already created a repo on Github, you can create a new branch as below:

git checkout -b some-sample

Then push the changes to the new branch:

git push --set-upstream origin some-sample

Unable to find type System.Windows.MessageBox error PowerShell

If you’re using a Message Box in your PowerShell script, chances are you’re running into this error while running the script in a PowerShell window.
But this error does not occur in PowerShell ISE.

If you generally run the command in PowerShell as below and you get the error:

[System.Windows.MessageBox]::Show("Test box")

Then try adding the Type using the below command and run the above command again:

Add-Type -AssemblyName PresentationFramework
[System.Windows.MessageBox]::Show("Test box")

The above type is part of the PresentationFramework.dll that was added with WPF.

The other type is the System.Windows.Forms which was added with Windows Forms, and exists within the Windows Forms assemblies.

So, add the type as below:

Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.MessageBox]::Show("Test box")

You can add these types in your script as per your need. If you’re script uses Params, just add the Add-Type line below it.

Using Fetch with React example async await

I’ve created a basic React App as described in my previous post. This is just a demo on how you can use fetch API to load data in the componentDidMount() lifecycle method with/without
async/await. I’ve not used any error handling yet.

The basic structure of the React App contains index.js and index.html files. The code is added to my Github profile.

Replace the code of the index.js file as below:

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
ReactDOM.render(<App />, document.getElementById('root'));

Create App.js file under the src directory and add the below code:

import React, { Component } from "react";
import MyComp from "./MyComp";
export default class App extends Component {
    render() {
        return (
          <div className="App">
            <MyComp />
          </div>
        );
      }
}

It’s time to create MyComp which is the sample component that will call the placeholder JSON API to show the list of users using Fetch GET request.

The code for MyComp is as shown below:

import React from "react";
export default class MyComp extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            usernames : []
        };
    }
    componentDidMount() {
        fetch('https://jsonplaceholder.typicode.com/users')
            .then(res => res.json())
            .then(json => this.setState({ usernames: json }));
    }
    render() {
        return(
            <div>
                Hey guys!
                <ul>
                {this.state.usernames.map(user => (
                    <li key={user.username}>
                    Hello, {user.username}
                    </li>
                ))}
                </ul>
            </div>
        );
    }
}

Run the App using as below:

npm start

The above code will now use async/await. It is a clean asynchronous way to call the API by writing unblocking code just like promises and callbacks.

Run the following command in the terminal:

npm i @babel/preset-env @babel/plugin-transform-runtime @babel/runtime --save

Replace the componentDidMount() code as below:

async componentDidMount() {
        const response = await fetch(`https://jsonplaceholder.typicode.com/users`);
        const json = await response.json();
        this.setState({ usernames: json });
    }

The async function which in this case is the componentDidMount contains the await expression that pauses the execution of the async function. It waits until the passed Promise is resolved. It then resumes the async function’s execution and evaluates as the resolved value.

Run the App again to see the results which are the same in this case.

You can also include headers and credentials in the Fetch call as shown below:

const myHeaders = new Headers();
myHeaders.append('token', 'xxxx');
const response = fetch(`http://someurl/home/details?username=someuser`, {
	credentials: 'include',
	headers: myHeaders,
	cors: 'cors'
  });