Mobile first css media queries

Mobile first css media queries to adjust UI controls for various resolutions:

@media (min-width:320px) { /* smartphones, portrait iPhone, portrait 480x320 phones (Android) */ }
@media (min-width:480px) { /* smartphones, Android phones, landscape iPhone */ }
@media (min-width:600px) { /* portrait tablets, portrait iPad, e-readers (Nook/Kindle), landscape 800x480 phones (Android) */ }
@media (min-width:801px) { /* tablet, landscape iPad, lo-res laptops ands desktops */ }
@media (min-width:1025px) { /* big landscape tablets, laptops, and desktops */ }
@media (min-width:1281px) { /* hi-res laptops and desktops */ }

Installing .NET on Android

This runs .NET natively
not in a vm
not in a container
no need to have root access or jailbreaking your android
.NET runs natively on android in user space

Install Termux apk on android

pkg install proot
pkg install proot-distro

proot-distro allows to install linux which runs along with android os. This is not a vm so we get native performance.

proot-distro commands:

    proot-distro list - show the supported distributions and their status.
    proot-distro install - install a distribution.
    proot-distro login - start a root shell for the distribution.
    proot-distro remove - uninstall the distribution.
    proot-distro reset - reinstall the distribution.

Following linux flavours are supported:

1. Alpine Linux (edge)
2. Arch Linux / Arch Linux 32 / Arch Linux ARM
3. Debian (stable)
4. Fedora 35
5. Manjaro AArch64
6. OpenSUSE (Tumbleweed)
7. Ubuntu (22.04)
8. Void Linux

Following are the steps for Ubuntu

proot-distro install ubuntu
proot-distro login ubuntu
su
apt install wget -y
apt install ssh -y
apt-get install -y net-tools

Manual installation of .NET: https://learn.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#scripted-install

wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh

cd ~/.dotnet
echo 'export DOTNET_ROOT=$HOME/.dotnet' >> ~/.bashrc
echo 'export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools' >> ~/.bashrc
source ~/.bashrc

Now the dotnet CLI can be used, more on this: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet

--REMOTE TERMUX--
https://gist.github.com/mjnaderi/b933fe940cd47b09d5cfc14875e77d67
https://glow.li/posts/run-an-ssh-server-on-your-android-with-termux/
Detailed video coming soon

Applications:
1. You can install cloudflared (Cloudflare zero trust) and then can host asp.net site on your android device
2. Run FTP server
3. Share the files without uploading anywhere

Amplifieing analog audio output from 3.5mm audio jack with PAM8403 amplifier

Aim

In this post we will develop an amplifier which amplifies 3.5mm analog audio output, You can use the circuit as a speaker for PC.

Introduction

Required Electronic Components:
1. PAM8403 Class D 3W amplifier
2. 3.3V 5.5V FT232RL FTDI USB to TTL Serial Adapter Module
3. 5V 3A USB power supply
4. USB Cable, A-Male to Mini-B Cord USB cable
5. 3W Speaker
6. Jumper Wires
7. AUX Cable

Detailed video here: https://youtu.be/CaUC_d9g3oc

C#: Convert any time to time in any timezone

You can use this to convert any server time to india time or any other time zone
here's possible list of all zone IDs which can be used in this method: https://nodatime.org/TimeZones

First add reference to NodaTime nuget package which is built by the ultimate Jon Skeet

Pun intended

/*
1. Jon Skeet can divide by zero.
2. When Jon Skeet's code fails to compile the compiler apologises.
3. If Jon-Skeet's program fails to compile they fix the compiler.
4. Jon Skeet coded his last project entirely in Microsoft Paint, just for the challenge.
5. Jon Skeet keeps a daily backup of the Internet on his USB pendrive.
*/

Jon Skeet handles all my exceptions

try
{
    insert.code.here();
}
catch(Exception ex)
{
  JonSkeet(ex);
}

here's the method

public DateTime ConvertToTimeZoneFromUtc(DateTime utcDateTime, string timezone)
{
    var easternTimeZone = DateTimeZoneProviders.Tzdb[timezone];
    return Instant.FromDateTimeUtc(utcDateTime)
                    .InZone(easternTimeZone)
                    .ToDateTimeUnspecified();
}

usage:

string zoneID = "Asia/Kolkata";
var date = ConvertToTimeZoneFromUtc(DateTime.Now.ToUniversalTime(), zoneID);

SkeetOverflow link: https://stackoverflow.com/questions/75580559/hot-to-change-the-default-datetime-date-of-app-hosted-on-cloud-server-side-to-m/75581290

Many times, we store dates in our database by passing DateTime as a parameter value or by using GETDATE() in SQL Server. In both the cases, the time of the current machine is passed as the value. It is OK in case of Desktop applications however, when we move to Web applications, the current computer is the server where the website/app is hosted. This means if you’re in India and the website is hosted in a server in the US, the time stored in the database will be US time and not your local time. The correct way is to store the time in the local timezone. In this post we will see how to convert a DateTime object into specific TimeZone in C#. To do this, we will use the FindSystemTimeZoneById() of TimeZoneInfo class. This function takes Id as a parameter to return the equivalent time in timezone passed. In the example below, we are taking the current system time and converting it into “Central Standard Time”. DateTime currentTime = TimeZoneInfo.ConvertTime(DateTime.Now, TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time")); Let me know via comments if you are aware of about other ways to perform this action.

Lifetime unlimited money through manual SWP in mutual funds

The ₹1 lac example:

1. Invest a lump sum in multiple high performing equity mutual fund e.g. ₹1lac
2. Wait for 1+ year - yea! Let it grow for sometime
3. Withdraw ₹1k per month on a fixed date (to minimize loss: withdraw only if mutual fund returns are greater than or equal to 13%)

More realistic example

Suppose you have ₹1k society maintainance bill:

Real-Time excel calculations

With initial investment of ₹1,00,000
Here you can see I have withdrawed ₹1,64,759 in 10 years
and still ₹87,361 is remaining in the account
If you keep withdrawing infinitely still money remains in the account
Download Withdrawl plan

Notes:

1. mutual funds are subject to market risks, market down huwa to samjho paisa gaya
2. works well if you choose the right mutual fund and start SWP after one year.
3. Most trading/mutual fund platforms do not allow auto SWP of mutual funds, here's BSE circular https://www.bseindia.com/markets/MarketInfo/DispNewNoticesCirculars.aspx?page=20220713-1. Hence manual SWP needs to be done.
4. its just a theory, try at your own risk

https://github.com/nitinjs/unlimited-money

GF: marathi meme

Ethical hacking: Hassle free logging of IP address of any person

Aim

In this article we will write static HTML and javascript client side code to log the IP address of the person just by sending him the web page link.

Introduction

PostMail: used to send email using javascript.
IpApi.co: used to get IP address and geolocation details at client side javascript

First Let's create simple jQuery plugin to send GET the CORS resource hosted at ipapi.com.
With recent version of jQuery it forces us to follow CORS policy so I am using plain JavaScript

jQuery.getCORS = function (source, func) {
    var xmlHttpRequestObject;
    if (window.XMLHttpRequest) {
        xmlHttpRequestObject = new XMLHttpRequest();
        if (xmlHttpRequestObject != null) {
            var sUrl = source;
            xmlHttpRequestObject.open("GET", sUrl, true);
            xmlHttpRequestObject.onreadystatechange = function () {
                func(xmlHttpRequestObject.responseText);
            };
            xmlHttpRequestObject.send();
        } else {
            func("Error creating XmlHttpRequest object. Client is not CORS enabled");
        }
    }
};
 

Following code retrieves the IP address of the user at client side

$.getCORS('https://ipapi.co/json/', function (data) {
	console.log(data);
};
 

For example following is response from ipapi for 8.8.8.8 google ip address:

Now lets get API key from PostMail
Go to the site https://postmail.invotes.com/, enter your email address and after submission you will get link in the email.

POST request to send email from javascript using postmail API

var data = {
	"access_token": "PostMail Access Token Here"
};

data['subject'] = "Send email from javascript";
data['text'] = "This is test email";

$.post('https://postmail.invotes.com/send',
    data,
    function () {
        //success
    }
).fail(function () {
    //error
});

Final version:

    
    

    
Loading...
]]>

This code is available on github, editable at stackblitz⚡️

References

How to send an email from JavaScript: https://stackoverflow.com/a/36656479/223752
PostMail: https://postmail.invotes.com/
IP geolocation API: https://ipapi.co

Note: I am not affiliated with PostMail or ipapi.co

परीक्षा: marathi meme