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U256 String Analysis issue Ethers.js
When working with Ethereum JSON-RPC API, the strings do not sign 256-bit healthy numbers (U256) from the strings. However, this example uses the From_str () method has some questions that make incorrect results.
Problem: Incorrect U256 Strings Analysis
Ethers.js, U256 :: From_str () trying to analyze the line as if it were not signed by a 256 -bit integer. The problem lies in how the analyzer processes input data:
`Rūdys
Allow the amount_in = u256 :: from_str (« 1000000000 »). Updrap ();
`
That’s what happens:
U256 :: From_Str ()trying to analyze the line as a hexadecimal number.
- However, the analysis process is incorrect because Ethers.JS assumes that the input data is not signed by 256 -bit integers (32 bytes). Parse is trying to interpret the entire line as one value of 32 bytes.
- As a result, Sea_in will be determined as the value of the hexagonal lines (
1000000000"), not the 256 -bit integer.
Result: incorrectly analyzed u256
By calling the UNWRAP () in the analysis of the analysis, you will get an error message indicating that the analysis failed:
Javascript
Error: Invalid argument type U256 :: from_str (string)
`
To solve this problem, we need to use a stronger way to analyze the unsigned 256 -bit healthy number of Ethers.js.
To correct the problem
One solution is to use the « parse () » method « that allows us to indicate the input format:
`Rūdys
Let the amount_in = u256 :: parse (« 1000000000 », & [0x10] as U8)
.Unwrap ();
Println! (« Parsed sums: {} », quantity_in);
`
In this corrected code:
- To indicate that we are analyzing an unsigned 256 -bit healthy number.
- The input data is a hexagonal line (
1000000000) that corresponds to Ethers.js expected format.
Conclusion
To avoid incorrect U256 strings analysis of Ethers.js, be sure to use Parse () « method ». This ensures that the analyzer correctly interprets the input data as an undetermined 256 -bit healthy number (32 bytes in length).
Based on this revised example of code, you can ensure an accurate and reliable analysis of the 256 -bit healthy numbers in your Ethereum programs designed with ether.