Solana: Changed data size error

I see what you do. Here is an article with instructions for handling the “data size error” if you use SOL_INVOKE_SIGNED_C on rust:

Error processing: Error in the Solana data size **

If you create a personalized Rust library for Solana's intelligent contracts, a common problem with the "data size error" will occur when callingSol_invoke_signed_c ‘. This error occurs due to the requirements for checking the Solan signature.

Understand the error

“Data size error” usually results from incorrect coding or decoding data. This is done in this context because “VEC” and other data structures do not support arbitrary precision goals such as the goals used in Solana.

Solution: Use the correct data structure

To solve this problem, you have to use a data structure with which arbitrarily large numbers such as “U64” or “U128” can save. You can create a personalized type that envelops the ‘U64’ and delivers methods for arithmetic surgery.

Here is an example of how you can determine this type:

`Rust

Use std :: Confvert :: {from, in};

Structures signed date (U64);

Implemented date {

fn new (value: U64) -> self {

Signing date (value)

}

Fn get_value (& self) -> U64 {

yourself 0

}

}

Impl from for signed date {

fn of (value: u64) -> self {

Signing date (value)

}

}

Use example

You can now create a signed date of copy and use it with SOL_INVOKE_SIGNED_C ‘:

`Rust

Use Solana_Program :: {

Account_info :: {Next_Account_info, Accountinfo},

Input point,

Program_error :: Programrror,

Pubkey :: pubkey,

};

Entry points! (Process_Instruction);

Fn process_instruction (

_Account_info: Accountinfo,

Command_data: & [U8],

_Signing_Key_id: & Public,

) -> Result <_, programror> {

Let us sign_data = signeddata :: new (1);

Println! ("Signed data value: {}", signed_data.get_value ());

// Call the signed data Sol_invoke_signed_c

Let (results, results_signer_id) = SOL_INVOKE_SIGNED_C (((

Instructions_data,

& signed_data,

Next_account_info (),

_Signing_Key_id,

);

Good (())

}

Best Practices

Think of the following practices when you work with Solvoke_signed_c:

• Always use the right memory structure and large numbers.

• Use ‘of’ characteristics to convert between ‘U64and' 'signed.

• When creating a signed date of the sample, make sure that it is correctly initialized to avoid problems.

According to these guidelines and the use of the right data structures, you have to successfully dissolve in your personalized library withSol_invoke_signed_c ‘in your personalized library with rust for Solana -Smart contracts if you work with` Sol_invoke_signed_c’.

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