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Anchor provides utilities for converting between Anchor types and raw Solana types.

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AccountInfo conversion

Convert Anchor accounts to AccountInfo: 
let account_info = ctx.accounts.my_account.to_account_info();

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Key extraction

Get the public key from any account: 
let pubkey = ctx.accounts.my_account.key();

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Borrowing account data

Access raw account data: 
let data = ctx.accounts.my_account.try_borrow_data()?;
let mut data = ctx.accounts.my_account.try_borrow_mut_data()?;

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Converting from AccountInfo

Load an Anchor account from AccountInfo: 
let my_account = Account::<MyAccount>::try_from(&account_info)?;

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Program ID access

let program_id = ctx.accounts.my_program.key();
// or
let program_id = *ctx.program_id;

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Complete example

pub fn process(ctx: Context<Process>) -> Result<()> {
    // Get AccountInfo
    let account_info = ctx.accounts.data.to_account_info();
    
    // Get key
    let key = ctx.accounts.data.key();
    
    // Access raw data
    let data = account_info.try_borrow_data()?;
    
    Ok(())
}

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