Obtaining a BString from Lua VM

[Zachareee]

Hello! I've been working with mlua for more than a week and I'm now stuck on this problem.

I'm using my lua script to read a file ( io.open("filename.zip", "rb"):read("*a") ), but I'm not sure how to label this data type when using Lua::from_value from the serialize feature flag.

Here is the struct I'm expecting to deserialize the table into, with data holding the nil-able bytestring:

#[derive(Deserialize)]
struct InterFileDetails {
    pub tag: String,
    pub folder_name: String,
    pub last_modified: SystemTime,
    pub data: Option<?>,
}

Here are the deserialize errors I get for each type I tried to substitute the question mark with:

• Box<str>: invalid value: byte array, expected a string
• Box<[u8]>: invalid type: string, expected table
• Vec<u8>: invalid type: string, expected table
• String: invalid value: byte array, expected a string

What type exactly should I substitute the question mark with to retrieve my bytestring using from_value?

[khvzak]

You can use BString or Bytes (from bytes crate with serde feature flag)

[Zachareee]

@khvzak oh yes I forgot to mention, I also tried using BString, but I got the following compilation error: the trait Deserialize<'_> is not implemented for BString, which is required by std::option::Option<BString>: Deserialize<'_>

Using Bytes from the bytes crate work though!

[khvzak]

Oh, this is because I forgot to enable serde feature flag for bstr.
You still can use BString, just add bstr = { version = "1.0", features ["serde"] } to your Cargo.toml

[Zachareee]

Will this be updated in a future version or will this stay as a "workaround" of sorts?

[khvzak]

This is already fixed in a01b032