React Naitive TypeError: cli.init is not a function - Solution Fix

Because of recent version has bugs, so downgrade to previous version like below.

 npx react-native init <YourProjectName> --version 0.68.2

Unable to resolve module react-native-reanimated

step 1. npm i react-native-reanimated

step 2. add plugin babel.config.js

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
   plugins: [
          'react-native-reanimated/plugin',
      ],
};

step 3 When trying to run the code after close the terminal I still I'm facing same issue

  Error: Reanimated 2 failed to create a worklet, maybe you forgot to add Reanimated's babel plugin

step 4. After that, i close the current terminal and run this command

npm start -- --reset-cache 

Enjoy !

AVD - Android Emulator Device Slow Process Solution !

 1. Open <Project>/android/build.gradle

2. add jcenter() and add mavenCentral() before each of them (Make sure to add mavenCenteral() in both spots where jcenter() is found.)

2.1   repositories {

        google()

        mavenCentral() // New line

        jcenter()

       // NOTE: Keep any other entries you may have had here

    }

2.2 allprojects {

    repositories {

        google()

        mavenCentral() // New line

        jcenter()

       // NOTE: Keep any other entries you may have had here

    }

React Native TypeError: cli.init is not a function Error !

1. Dont use react-native init <ProjectName>

use like below.

npx react-native init YourProjectName --version 0.68.2

Android Virtual Device - AVD Setup

 1. Install Andriod SDK

2. Set environment for ANDROID_HOME=/home/android/sdk...

3. Install AVD or Android Studio

4. Open Android Studio 

           /home/android-studio/bin/

                        ./studio.sh

5. In that android Studio, you can see Configure Button -> AVD

6. Create Virutal Device or AVD like below. 

7. Start The Emulator by click Play button

8. Add environment variable.

      8.1  goto /etc/profile.d/    [create one file.sh] ex: > sudo vi myenv.sh

         

      export ANDROID_HOME=$HOME/Library/Android/sdk

      export PATH=$PATH:$ANDROID_HOME/emulator
      export PATH=$PATH:$ANDROID_HOME/tools
      export PATH=$PATH:$ANDROID_HOME/tools/bin
      export PATH=$PATH:$ANDROID_HOME/platform-tools

9. > source /etc/profile

How to enable JavaScript in your Chrome browser for localhost

 

Google Chrome

1. On the web browser menu click on the "Customize and control Google Chrome" and select "Settings".
2. In the "Settings" section click on the "Show advanced settings..."
3. Under the the "Privacy" click on the "Content settings...".
4. When the dialog window opens, look for the "JavaScript" section and select "Allow all sites to run JavaScript (recommended)".
5. Click on the "OK" button to close it.
6. Close the "Settings" tab.
7. Click on the "Reload this page" button of the web browser to refresh the page.

Ubuntu Linux - Connect Postgresql from Psql and also PGadmin Remotely

 Step 1 :

> sudo su

> vi /etc/postgresql/10/main/postgresql.conf

#listen_addresses = 'localhost'

to 

listen_addresses = '*'

>vi /etc/postgresql/10/main/pg_hba.conf
# IPv4 local connections:
host    all             all    127.0.0.1/32  md5

to
host    all             all   0.0.0.0/0   md5


>sudo ufw allow 5432/tcp
>sudo systemctl restart postgresql


     
>psql -h localhost -d databasename -U userrolename
    ...enterpasswordfor-userrolename

Security : Java PHP encryption decryption for AES-128-CTR or AES/CTR/NoPadding

 Java

package com.security;

import java.util.Base64;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

/**

 * @author drvijay

 * @date 13-0ct-2021

 */

public class EncryptDecrypt

{

private static String encrypt ( String data, String cipherType, String key, String iv )

{

String encrypted = "";

try

{

Cipher encryptionCipher = Cipher.getInstance ( cipherType );

IvParameterSpec ivv = new IvParameterSpec ( iv.getBytes ( "UTF-8" ), 0, encryptionCipher.getBlockSize () );

encryptionCipher.init ( Cipher.ENCRYPT_MODE, new SecretKeySpec ( key.getBytes (), "AES" ), ivv );

// encrypt

byte [] cipherText = encryptionCipher.doFinal ( data.getBytes () );

encrypted = new String ( Base64.getEncoder ().encode ( cipherText ) );

}

catch ( Exception e )

{

throw new IllegalStateException ( e );

}

return encrypted;

}

private static String decrypt ( String encryptData, String cipherType, String key, String iv )

{

String decrypted = "";

try

{

Cipher decryptionCipher = Cipher.getInstance ( cipherType );

IvParameterSpec ivv = new IvParameterSpec ( iv.getBytes ( "UTF-8" ), 0, decryptionCipher.getBlockSize () );

SecretKeySpec secretKeySpec = new SecretKeySpec ( key.getBytes (), "AES" );

decryptionCipher.init ( Cipher.DECRYPT_MODE, secretKeySpec, ivv );

// decrypt

byte [] finalCipherText = decryptionCipher.doFinal ( Base64.getDecoder ().decode ( encryptData ) );

// converting to string

String finalDecryptedValue = new String ( finalCipherText );

decrypted = finalDecryptedValue;

}

catch ( Exception e )

{

throw new IllegalStateException ( e );

}

return decrypted;

}

public static void main ( String [] args )

{

String cipherType = "AES/CTR/NoPadding";

String valueToEncrypt = "hello, vijay";

String key = "0123456789abcdef";

String iv = "2208250639374785";

String encrypted = encrypt ( valueToEncrypt, cipherType, key, iv );

String decrypted = decrypt ( encrypted, cipherType, key, iv );

//System.out.println(Base64.getDecoder ().decode ( "ycbnIE8vn2lTUi/9F/FEa+5v86qzOU09yjdxfGDc8wA=" ));

// END OF ENCODE CODE

System.out.println ( "encrypted and saved as Base64 : " + encrypted );

System.out.println ( "decrypted from Base64->aes128 : " + decrypted );

// END OF DECRYPT CODE

}

}

PHP code

<!DOCTYPE html>

<html>

<body>

<?php

$simple_string = "hello, vijay";

echo ($simple_string .'<br/>');

        $ciphering = 'AES-128-CTR';

        $iv_length = openssl_cipher_iv_length($ciphering);

        $options = 0;

        // Non-NULL Initialization Vector for encryption

        $iv = '2208250639374785';

       

        $key = '0123456789abcdef';

                $encryption = openssl_encrypt($simple_string, $ciphering,

                    $key, $options, $iv); 

                    echo($encryption .'<br/>');

                    

                  $decryption=openssl_decrypt ($encryption, $ciphering,

                $key, $options, $iv);

                echo($decryption .'<br/>');

                

?>

</body>

</html>

output

hello, vijay
0iQoUVC/QZG3cM20
hello, vijay

Java to Do ImageMagick Call

 package com.product.zilly;

import java.io.File;

import java.util.Map;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @author drvijay

 * @description img class

 * @version 1.0

 */

@SuppressWarnings ("all")

public class TestModules implements Constants

{

private static final Logger logger = LoggerFactory.getLogger ( TestModules.class );

public static void main ( String args[] )

{

ImageHelper imageHelper = new ImageHelper ();

String renditionPath = "/home/drvijay/images"; 

String rendtionPathCategory = "/home/drvijay/images"; 

String startingMainPath = renditionPath + PATH_SEPARATOR + SkuRendition.main;

String startingCategoryMainPath = rendtionPathCategory + PATH_SEPARATOR + SkuRendition.main; // for category images main path

imageHelper.loadSkuImageProperties ();

boolean imageOverride = false; 

File rotated = null;

File file = new File ( startingMainPath + PATH_SEPARATOR + "sample.png" );

if ( file.isFile () && file.exists () )

{

Map <SkuRendition, Map <Resolution, DimInfo>> dimensions = imageHelper.getAllDimensions ();

logger.debug ( dimensions.toString () );

for ( SkuRendition skuRendition : dimensions.keySet () )

{

try

{

Map <Resolution, DimInfo> resolutions = dimensions.get ( skuRendition );

for ( Resolution resolution : resolutions.keySet () )

{

DimInfo dimInfo = resolutions.get ( resolution );

File isExist = new File ( renditionPath + PATH_SEPARATOR + skuRendition.name () + PATH_SEPARATOR + resolution.name () + UNDER_SCORE + file.getName () );

if ( ( imageOverride && isExist.isFile () && isExist.exists () ) || ( !isExist.isFile () && !isExist.exists () ) )

{

rotated = imageHelper.processImage ( file, imageHelper.getOutputDir ( renditionPath, skuRendition.name () ), dimInfo, resolution.name () );

logger.debug ( "Generated : " + rotated.getAbsolutePath () );

}

}

}

catch ( Exception e )

{

logger.error ( "Error : " + e );

}

finally

{

/*

* if ( rotated != null )

* {

* rotated.delete ();

* }

*/

}

}

}

}

}

//Iamge Process

public File processImage ( File inFile, File outputDir, DimInfo dimInfo, String resolution ) throws Exception

{

String fileName = resolution + UNDER_SCORE + inFile.getName ();

// String fileNameWithOutExt = FilenameUtils.removeExtension(fileName);

// String fileNameExt = FilenameUtils.getExtension ( fileName );

// check for windows and set the image magick home manually to avoid error.

String OS = System.getProperty ( "os.name" ).toLowerCase ();

if ( ( OS.indexOf ( "win" ) >= 0 ) )

{

// linux - "/usr/lib/mime/packages/imagemagick-6.q16";

String myPath = "C:/Program Files/ImageMagick-6.9.2-Q16"; // globalMaster.getSystemProperties ().get ( KEY_PATH_HOME_IMAGE_MAGICK ).getValue ();

ProcessStarter.setGlobalSearchPath ( myPath );

}

ConvertCmd convert = new ConvertCmd ();

IMOperation operation = new IMOperation ();

String input = inFile.getAbsolutePath ();

int tmbWidth = dimInfo.getWidth ();

int tmbHeight = dimInfo.getHeight ();

operation.addImage ( input );

operation.gravity ( LocalProperties.getPropertyValue ( "render.image.gravity" ) );

operation.thumbnail ( tmbHeight, tmbWidth );

operation.units ( LocalProperties.getPropertyValue ( "render.image.units" ) );

operation.density ( Integer.parseInt ( LocalProperties.getPropertyValue ( "render.image.density" ) ) );

operation.strip ();

operation.interlace ( LocalProperties.getPropertyValue ( "render.image.interlace" ) );

operation.gaussianBlur ( Double.parseDouble ( LocalProperties.getPropertyValue ( "render.image.gaussian.blur" ) ) );

operation.quality ( Double.parseDouble ( LocalProperties.getPropertyValue ( "render.image.quality" ) ) );

File retVal = new File ( outputDir, fileName );

operation.addImage ( retVal.getAbsolutePath () );

convert.run ( operation );

logger.debug ( "Preview file: " + retVal.getAbsolutePath () );

return retVal;

}

Install Latest ImageMagick to support PNG, JPG convertions

 #These are the steps required in order to Install ImageMagick with JPG, PNG and TIFF delegates.

sudo apt-get update 

#Install Build-Essential in order to configure and make the final Install

sudo apt-get install build-essential 

#libjpg62-dev required in order to work with basic JPG files

sudo apt-get install -y libjpeg62-dev 

#libtiff-dev is required in order to work with TIFF file format

sudo apt-get install -y libtiff-dev 

#libpng-dev required in order to work with basic PNG files

sudo apt-get install -y libpng-dev

#Download ImageMagick

wget https://www.imagemagick.org/download/ImageMagick.tar.gz 

#Untar Imagemagick

tar xvzf ImageMagick.tar.gz 

#Access the working directory

cd ImageMagick-[version_number] 

#Configure and make sure to disable the "shared" option

./configure --disable-shared

#Make

sudo make

#Install

sudo make install

#Final Check

sudo make check