qiwihui qiwihui

Simple Technical Guide for RGB++ Development

RGB++ Code Examples

Find code examples at https://github.com/ckb-cell/rgbpp-sdk/tree/develop/examples/rgbpp

Components

CKB Scripts (Contracts)
CKB Bitcoin SPV Type Script: A type script for Bitcoin SPV clients which synchronize Bitcoin state into CKB

Error Code (as `uint256` hex number)	Description
`0x00`	Used for generic compiler inserted panics.
`0x01`	If you call `assert` with an argument that evaluates to `false`.
`0x11`	If an arithmetic operation results in underflow or overflow outside of an `unchecked { ... }` block.
`0x12`	If you divide or modulo by zero (e.g. `5 / 0 or 23 % 0`)
`0x21`	If you convert a value that is too big or negative into an enum type.
`0x22`	If you access a storage byte array that is incorrectly encoded.
`0x31`	If you call `.pop()` on an empty array.
`0x32`	If you access an array, `bytesN` or an array slice at an out-of-bounds or negative index (i.e. `x[i]` where `i >= x.length` or `i < 0`).

经查明，发现大狗老师应该是导出时出问题了，所以没有得到这个mtl文件，但这个mtl文件也很简单，直接添加一个即可

newmtl palette
illum 1
Ka 0.000 0.000 0.000
Kd 1.000 1.000 1.000
Ks 0.000 0.000 0.000
map_Kd monu1.vox.png # 可以换成其他图片。

Sending Ether Cheat Sheet

TLDR

🥇 Instead of sending Ether, use the withdrawal pattern

🥈 If you really need to send Ether, use a safe wrapper like OpenZeppelin's Address.sendValue(addr, amount)

🥉 If you really need to send Ether without dependencies, use (bool success, ) = addr.call{value: amount}("")

My GitHub Feature Wishlist for 2020

I use GitHub nearly every day. In general, it's delightful to use and I've been impressed with the rapid pace of improvements, especially as of late.

That said, there's a handful of features that would have a big impact on my day-to-day experience. I'm cataloging them here with the aim of increasing visibility and prompting further discussion.

Disclaimer: It is not my intention that any visual designs be taken literally – I only hope that they may serve as useful source of inspiration.

	import * as web3 from "@solana/web3.js";

	//////////////////////////////////////////////////

	function readBytes(buf: Buffer, offset: number, length: number): Buffer {
	const end = offset + length;
	if (buf.byteLength < end) throw new RangeError("range out of bounds");
	return buf.subarray(offset, end);
	}

	from operator import mul, add
	from functools import reduce
	def chinese_remainder_theorem(tuple):
	transpose = list(zip(*tuple))
	product = reduce(mul, transpose[0])
	min_result = reduce(add, [
	j * l *(l%i) for i,j in tuple for l in [reduce(mul, [k for k in transpose[0] if k != i])]
	]) % product
	print("The value is: %s + n * %s which n = 0..inf" % (min_result, product))
	return min_result, product

	# From https://stackoverflow.com/a/68876046/1319998, which is itself inspired by https://stackoverflow.com/a/68814418/1319998

	from contextlib import contextmanager
	from collections import namedtuple
	from ctypes import cdll, byref, string_at, c_char_p, c_int, c_double, c_int64, c_void_p
	from ctypes.util import find_library
	from sys import platform


	def query(db_file, sql, params=()):

	###########################################################
	# How to NEVER use lambdas. An inneficient and yet educa- #
	# tonal [sic] guide to the proper misuse of the lambda #
	# construct in Python 3.x. [DO NOT USE ANY OF THIS EVER] #
	# original by (and apologies to): e000 (13/6/11) #
	# now in Python 3 courtesy of: khuxkm (17/9/20) #
	###########################################################

	## Part 1. Basic LAMBDA Introduction ##
	# If you're reading this, you've probably already read e000's

	// these aren't _quite_ functional tests,
	// and should all be compile_fail,
	// but may be illustrative

	#[test]
	fn concurrent_set() {
	use std::sync::Arc;
	let x = Arc::new(Cell::new(42));
	let x1 = Arc::clone(&x);
	std::thread::spawn(move \|\| {