[英]How to filter by string parameter , web3 2.0.0-alpha.1 Solidity events?
I'm trying to filter some events , and I noticed since I updated the web3 to version 2.0.0-alpha 1 the event catch is a little bit different. 我正在尝试过滤一些事件,并且我注意到自从将web3更新为2.0.0-alpha 1版本以来,事件捕获有些不同。
I have a Smart Contract with this event : 我与此活动有智能合约:
event catchMeIfYouCan (address indexed a, string indexed b, uint indexed c);
And I want to filter by its parameters , so far so good. 到目前为止,我想按其参数进行过滤。 But when I try to filter by b ( the string indexed ) , this is not working. 但是,当我尝试按b(索引的字符串)进行过滤时,此方法不起作用。 I'm doing that in NodeJS with ExpressJS and the Web3 version mentioned above. 我在带有ExpressJS和上面提到的Web3版本的NodeJS中这样做。
If I do that : 如果我这样做:
const event = smartContract.events.catchMeIfYouCan({ filter : {
a : accountAddress ,
b : web3.utils.toHex(stringValue) ,
c : web3.utils.toWei("" + numberValue) }
}, (error, event) => {
// do some things
});
I get : 我得到:
Node error: {"code":-32602,"message":"invalid argument 1: hex has invalid length 96 after decoding"}
Otherwise , if I let the b parameter , in NodeJS event catch as : 否则,如果我让b参数在NodeJS事件中捕获为:
b : stringValue,
It doesn't catch the event anymore , same with c ( eg : no more web3.utils.toWei()
). 它不再捕获事件,与c相同(例如:no web3.utils.toWei()
)。
So , my question is : Do you have any idea how to filter the event by a string parameter in Web3 2.0.0-Alpha 1 version ? 因此,我的问题是:您是否知道如何在Web3 2.0.0-Alpha 1版本中通过字符串参数过滤事件?
Thank you for help & Have a nice day! 谢谢您的帮助,祝您有美好的一天!
Thanks for your question, I tested it and I believe its a bug with filter
感谢您的问题,我对其进行了测试,并相信它是带有filter
的错误
But I tried use topics
and it works 但是我尝试使用topics
并且有效
contract.events.CatchMeIfYouCan({
topics: [, web3.utils.sha3(stringValue)], // first element is empty, because its place for `address` index
fromBlock: 2000000
}, (error, event) => {
console.log(event)
})
So, I created an issue in web3.js
repo 因此,我在web3.js
库中创建了一个问题
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