shonminh / dailybook Goto Github PK

1. 研究一下 http://www.oraclize.it/

https://medium.com/coinmonks/how-to-create-a-dapp-using-truffle-oraclize-ethereum-bridge-and-webpack-9cb84b8f6bcb

truffle 安装 oraclize-api 出问题了， node版本10.5.0：
trufflesuite/truffle#985

使用remix调用合约的时候，传入bytes32[]数组的时候的写法：

Here is the solution:

You can't use empty space after a comma ,

You can't use ' --> instead use "

You have to use hex 0x...

Example:

"0x123","0x123","0x123","0x123","0x123","0x123","0x123"

python -c "import SimpleHTTPServer; m = SimpleHTTPServer.SimpleHTTPRequestHandler.extensions_map; m[''] = 'text/plain'; m.update(dict([(k, v + ';charset=UTF-8') for k, v in m.items()])); SimpleHTTPServer.test();"

一张图理解echart中的相关概念。

https://ethereum.stackexchange.com/questions/43362/what-is-msg-value

msg.data (bytes): complete calldata
msg.gas (uint): remaining gas - deprecated in version 0.4.21 and to be replaced by gasleft()
msg.sender (address): sender of the message (current call)
msg.sig (bytes4): first four bytes of the calldata (i.e. function identifier)
msg.value (uint): number of wei sent with the message

https://stackoverflow.com/questions/13444414/why-is-int-a-new-int0-allowed

要做实体转义，类似于如下几种情况：
jdbc:mysql://127.0.0.1:3306/alan_oauth?characterEncoding=UTF-8&useSSL=false&autoReconnect=true

私钥长度：64，十六进制。

采用源码安装

• https://solidity.readthedocs.io/en/develop/installing-solidity.html#building-from-source