如何将十六进制字符串转换为 Vec<u8>

如何解决如何将十六进制字符串转换为 Vec<u8>

我想将作为外部数据获得的十六进制字符串转换为托盘中的 Vec。 出于这个原因，我尝试使用“hex::decode”，但出现以下编译错误并且无法使用它。 你能告诉我解决方法或替代方法吗？

我有以下错误。

  error: duplicate lang item in crate `sp_io` (which `pallet_offchain` depends on): `panic_impl`.
    |
    = note: the lang item is first defined in crate `std` (which `hex` depends on)
    = note: first deFinition in `std` loaded from /Users/shin.takahashi/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unkNown-unkNown/lib/libstd-38314f0df48bc600.rlib
    = note: second deFinition in `sp_io` loaded from /Users/shin.takahashi/develop/substrate/newest_node_template/substrate-node-template/target/release/wbuild/node-template-runtime/target/wasm32-unkNown-unkNown/release/deps/libsp_io-33eeda8e29be2065.rMeta

  error: duplicate lang item in crate `sp_io` (which `pallet_offchain` depends on): `oom`.
    |
    = note: the lang item is first defined in crate `std` (which `hex` depends on)
    = note: first deFinition in `std` loaded from /Users/shin.takahashi/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unkNown-unkNown/lib/libstd-38314f0df48bc600.rlib
    = note: second deFinition in `sp_io` loaded from /Users/shin.takahashi/develop/substrate/newest_node_template/substrate-node-template/target/release/wbuild/node-template-runtime/target/wasm32-unkNown-unkNown/release/deps/libsp_io-33eeda8e29be2065.rMeta

  error: aborting due to 2 prevIoUs errors; 6 warnings emitted

我的代码如下。

fn get_decoded_address(address:&str)-> Vec<u8> {
    //value of address is like following. "0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d"
    hex::decode(&address).unwrap()
}

解决方法

我必须正确地写“Cargo.toml”。以下是示例。

rustc-hex = { version="2.1.0",default-features = false }

[features]
default = ['std']
std = [
    'rustc-hex/std',]