Setting Up the Project

Building a Complete DApp

Chapter 2: Setting Up the Project

Initialize the Anchor project and frontend.

• Steps:

  1. anchor init marketplace

  2. Add React and Web3.js dependencies.

  3. Configure Anchor.toml for localnet.

• Interactivity: Copy setup commands from a terminal emulator.

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Chapter 3: Implementing the Backend with Anchor

Create the marketplace program with listing and buying logic.

• Key Instructions:

  • list_item: Stores item data in a PDA.

  • buy_item: Transfers SOL and updates the PDA.

• Code Example:

pub fn list_item(ctx: Context<ListItem>, price: u64) -> Result<()> {
    let item = &mut ctx.accounts.item;
    item.seller = *ctx.accounts.seller.key;
    item.price = price;
    item.is_sold = false;
    Ok(())
}

pub fn buy_item(ctx: Context<BuyItem>) -> Result<()> {
    let item = &mut ctx.accounts.item;
    require!(!item.is_sold, MarketplaceError::ItemSold);
    // Transfer SOL logic
    item.is_sold = true;
    Ok(())
}

• Interactivity: Simulate listing and buying items, seeing PDA updates.