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Chee Wee's discoveries and tech blog

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Chee Wee's discoveries and tech blog

Something to ponder: using interfaces with class type variables

Posted over 6 years ago

by chuacw

One of the issues I've encountered recently is code like this: type ISomeIntf = interface procedure SomeMethod; end; TSomeClass = class(TInterfacedObject...
Chee Wee's discoveries and tech blog

How to write Truffle scripts to test your Solidity contracts automatically

Posted over 6 years ago

by chuacw

Every Truffle script is a Javascript app. So, if you're familiar with writing Javascript, you already know how to write a Truffle script. How do you...
Chee Wee's discoveries and tech blog

Retrieving blocked attachments from Google with Delphi

Posted over 6 years ago

by chuacw

So, I was looking at an old email, and there was an attachment. Unfortunately, Google's Gmail had blocked the attachment, thinking it had a virus attached...
Chee Wee's discoveries and tech blog

Automated clicking on HTML elements

Posted over 7 years ago

by chuacw

On a HTML page, elements can be retrieved either by using the getElementsByClassName or the getElementById method. The getElementById method returns just...
Chee Wee's discoveries and tech blog

Persisting enumeration and sets to JSON

Posted over 7 years ago

by chuacw

I've created a demo on persisting enumeration and sets to JSON format. The default Delphi RTL persists enumeration as their names. The improvement...
Chee Wee's discoveries and tech blog

Why you need to make your string parameter a const

Posted over 7 years ago

by chuacw

I have often wanted to point this out, but didn't really feel the need to, until today, when I was debugging into the RTL. When you have a string parameter...
Chee Wee's discoveries and tech blog

How to install Ganache

Posted over 7 years ago

by chuacw

The latest Ethereum tool, is Ganache, an one-click Blockchain. It's distributed in appx format, which apparently, is only supported by Windows 10....
Chee Wee's discoveries and tech blog

Removing custom contracts and tokens

Posted over 7 years ago

by chuacw

Here's how to remove custom contracts and tokens in Ethereum Wallet / Mist Open up the Wallet UI For tokens: run this command in the console: Tokens...
Chee Wee's discoveries and tech blog

Definitive list of affected Parity wallets and the actual ETH affected

Posted over 7 years ago

by chuacw

Recently, someone managed to kill the library upon which Parity multisig wallets rely upon, and as a result, all the Parity multisig wallets were unable...
Chee Wee's discoveries and tech blog

How to get started with Solidity development and testing

Posted over 7 years ago

by chuacw

A quick primer to getting started with Solidity development and testing. Download these applications Atom editor Node.js Install Node and the Atom editor...
Chee Wee's discoveries and tech blog

CodeRage is coming!

Posted over 7 years ago

by chuacw

CodeRage is coming! Register now: https://register.gotowebinar.com/register/7990350396754529539
Chee Wee's discoveries and tech blog

Knowledge dump for Solidity and Javascript

Posted over 7 years ago

by chuacw

To get a Solidity contract's ABI, paste the contract into the Remix online Solidity compiler , click Compile, and click on Details. The ABI is then...
Chee Wee's discoveries and tech blog

Notes regarding CSC codes

Posted over 7 years ago

by chuacw

The original CSC code is located in the file: /efs/imei/mps_code.dat The current CSC code is located in the file /system/csc/language.xml CSCs are located...
Chee Wee's discoveries and tech blog

How to backup and restore with TWRP on Android

Posted over 7 years ago

by chuacw

Backup using TWRP, then execute the following on the Android device using the terminal spawned from TWRP. Ensure that the external SD card has more than...
Chee Wee's discoveries and tech blog

TLB editor

Posted over 7 years ago

by chuacw

Just in case I forget in future, RAD Studio no longer allows editing a type library directly. What can be done is to use the tlbimp utility, like so: tlbimp...
Chee Wee's discoveries and tech blog

IPv6 weirdness on Windows 2008 R2

Posted over 7 years ago

by chuacw

For some reason, suddenly, IPv6 on my Windows 2008 R2 system stopped working. I wasn't able to ping or trace route with the following commands: ping...
Chee Wee's discoveries and tech blog

Tips in optimizing calls to FreeMem and ReallocMem

Posted over 7 years ago

by chuacw

Working on an app today, I discovered 2 things that I'd like to note down. It's not necessary to check if a pointer is not nil before passing it...
Chee Wee's discoveries and tech blog

A Delphi compiler issue in enumerating and casting...

Posted over 7 years ago

by chuacw

So, I was working on yet another app, and stumbled onto yet another Delphi compiler/RTL issue. Here's a sample reproducible test case: program MercuryApp;...
Chee Wee's discoveries and tech blog

The internal workings of the Delphi Android service

Posted over 7 years ago

by chuacw

Every Delphi Android Service uses the FMX jar. In the FMX jar, there exists several helper classes, such as ProxyInterface, ProxyService, etc. When an...
Chee Wee's discoveries and tech blog

Firewall and PAServer on RedHat Enterprise Linux 7.3

Posted over 7 years ago

by chuacw

I've just tested and deployed an application to RHEL 7.3 with PAServer. One of the things I've discovered is that the firewall is by default enabled...
Chee Wee's discoveries and tech blog

RAD Studio 10.2 Tokyo has been released!

Posted over 7 years ago

by chuacw

Embarcadero has released its latest version of RAD Studio, 10.2 Tokyo . There is the first Linux LLVM-based compiler for Linux Enterprise development,...
Chee Wee's discoveries and tech blog

Creating a quick custom comparer for Delphi generics

Posted over 7 years ago

by chuacw

Let's say you have a type, type TMySecretData = record Timestamp: TDateTime; SecretInfo: string; // or some unknown type.... class function Create...
Chee Wee's discoveries and tech blog

Generics equality and comparing in Delphi

Posted over 7 years ago

by chuacw

Suppose you have 2 values that are declared as generics, and you want to perform equality, or comparison, how would you do this? Value1, Value2: V; You'll...
Chee Wee's discoveries and tech blog

Removing Silverlight

Posted over 7 years ago

by chuacw
- 0 Comments
Windows had forcibly installed Silverlight on my system, and I wanted to remove it, however, I did not find any Silverlight listed in the Programs and...
Chee Wee's discoveries and tech blog

IISCrypto40 - when to use it?

Posted over 7 years ago

by chuacw
- 0 Comments
Apparently, I've been having some system issues for a while, and I didn't realize it. So, after performing an OS recovery after running out of...