# Monero C++ Library This project is a library for using Monero wallets in C++ by wrapping [Monero Core's](https://github.com/monero-project/monero) C++ wallet, [wallet2](https://github.com/monero-project/monero/blob/master/src/wallet/wallet2.h). In addition, this project conforms to an [API specification](http://moneroecosystem.org/monero-java/monero-spec.pdf) intended to be intuitive, robust, and for long-term use in the Monero project. This library may be used to build Monero-related applications, such as GUIs, libraries in other languages (e.g. [monero-java](https://github.com/monero-ecosystem/monero-java)), or a compliant REST/JSON-RPC API. ## Main Features - Manage Monero wallets which connect to a daemon - Cohesive APIs and models with rigorous focus on ease-of-use - Query wallet transactions, transfers, and outputs by their many attributes - Be notified when blocks are added to the chain, as the wallet synchronizes, or when the wallet sends or receives funds - Full multisig support - Tested by over 100 JUnit test cases using a [native Java library](https://github.com/monero-ecosystem/monero-java) ## Sample Code This code introduces the API. See the [documentation](https://woodser.github.io/monero-cpp-library/annotated.html) or [specification PDF](http://moneroecosystem.org/monero-java/monero-spec.pdf) for more details. Note: This API might change depending on feedback, such as changing structs to classes, using pure object-oriented accessors and mutators, not using boost::optional with shared_ptrs, etc. Feedback is welcome. ```c++ // create a wallet from a mnemonic phrase string mnemonic = "hefty value later extra artistic firm radar yodel talent future fungal nutshell because sanity awesome nail unjustly rage unafraid cedar delayed thumbs comb custom sanity"; monero_wallet* wallet_restored = monero_wallet::create_wallet_from_mnemonic( "MyWalletRestored", // wallet path and name "supersecretpassword123", // wallet password monero_network_type::STAGENET, // network type mnemonic, // mnemonic phrase monero_rpc_connection("http://localhost:38081"), // daemon connection 380104 // restore height ); // synchronize the wallet and receive progress notifications struct : monero_sync_listener { void on_sync_progress(uint64_t height, uint64_t start_height, uint64_t end_height, double percent_done, const string& message) { // feed a progress bar? } } my_sync_listener; wallet_restored->sync(my_sync_listener); // start syncing the wallet continuously in the background wallet_restored->start_syncing(); // get balance, account, subaddresses string restored_primary = wallet_restored->get_primary_address(); uint64_t balance = wallet_restored->get_balance(); // can specify account and subaddress indices monero_account account = wallet_restored->get_account(1, true); // get account with subaddresses uint64_t unlocked_account_balance = account.m_unlocked_balance.get(); // get boost::optional value // query a transaction by id monero_tx_query tx_query; tx_query.m_id = "314a0f1375db31cea4dac4e0a51514a6282b43792269b3660166d4d2b46437ca"; shared_ptr tx = wallet_restored->get_txs(tx_query)[0]; for (const shared_ptr in_transfer : tx->m_incoming_transfers) { uint64_t in_amount = in_transfer->m_amount.get(); int account_index = in_transfer->m_account_index.get(); } // query incoming transfers to account 1 monero_transfer_query transfer_query; transfer_query.m_is_incoming = true; transfer_query.m_account_index = 1; vector> transfers = wallet_restored->get_transfers(transfer_query); // query unspent outputs monero_output_query output_query; output_query.m_is_spent = false; vector> outputs = wallet_restored->get_outputs(output_query); // create and sync a new wallet with a random mnemonic phrase monero_wallet* wallet_random = monero_wallet::create_wallet_random( "MyWalletRandom", // wallet path and name "supersecretpassword123", // wallet password monero_network_type::STAGENET, // network type monero_rpc_connection("http://localhost:38081"), // daemon connection "English" ); wallet_random->sync(); // continuously synchronize the wallet in the background wallet_random->start_syncing(); // get wallet info string random_mnemonic = wallet_random->get_mnemonic(); string random_primary = wallet_random->get_primary_address(); uint64_t random_height = wallet_random->get_height(); bool random_is_synced = wallet_random->is_synced(); // be notified when the wallet receives funds struct : monero_wallet_listener { void on_output_received(const monero_output_wallet& output) { cout << "Wallet received funds!" << endl; string tx_id = output.m_tx->m_id.get(); int account_index = output.m_account_index.get(); int subaddress_index = output.m_subaddress_index.get(); OUTPUT_RECEIVED = true; } } my_listener; wallet_random->add_listener(my_listener); // send funds from the restored wallet to the random wallet shared_ptr sent_tx = wallet_restored->send(0, wallet_random->get_address(1, 0), 50000).m_txs[0]; bool in_pool = sent_tx->m_in_tx_pool.get(); // true // mine with 7 threads to push the network along int num_threads = 7; bool is_background = false; bool ignore_battery = false; wallet_restored->start_mining(num_threads, is_background, ignore_battery); // wait for the next block to be added to the chain uint64_t next_height = wallet_random->wait_for_next_block(); // stop mining wallet_restored->stop_mining(); // create a request to send funds to multiple destinations in the random wallet monero_send_request send_request = monero_send_request(); send_request.m_account_index = 1; // withdraw funds from this account send_request.m_subaddress_indices = vector(); send_request.m_subaddress_indices.push_back(0); send_request.m_subaddress_indices.push_back(1); // withdraw funds from these subaddresses within the account send_request.m_priority = monero_send_priority::UNIMPORTANT; // no rush vector> destinations; // specify the recipients and their amounts destinations.push_back(make_shared(wallet_random->get_address(1, 0), 50000)); destinations.push_back(make_shared(wallet_random->get_address(2, 0), 50000)); send_request.m_destinations = destinations; // create the transaction, confirm with the user, and relay to the network shared_ptr created_tx = wallet_restored->create_tx(send_request).m_txs[0]; uint64_t fee = created_tx->m_fee.get(); // "Are you sure you want to send ...?" wallet_restored->relay_tx(*created_tx); // submit the transaction to the Monero network which will notify the recipient wallet ``` ## How to Run This Library The following dependencies must be set up before running this project. 1. Set up Boost 1. Download and extract the boost 1.69.0 source code zip from https://www.boost.org/users/download/ to ./external/boost-sdk/. 2. `cd ./external/boost-sdk/` 3. `./bootstraph.sh` 4. `./b2` 5. Copy .a files from ./external/boost-sdk/bin.v2/libs/\*/link-static/\* to ./external-libs/boost according to CMakeLists.txt. 2. Set up OpenSSL 1. Download and extract the latest OpenSSL source code zip from https://github.com/openssl/openssl to ./external/openssl-sdk/. 2. Build for your system.
Mac: installed through boost at /usr/local/opt/openssl/lib 3. Copy libcrypto.a and libssl.a ./external-libs/openssl. 3. Set up Monero Core 1. Initialize submodules: `git submodule update --init --recursive` 2. cd ./submodules/monero-core 3. Modify CMakeLists.txt: `option(BUILD_GUI_DEPS "Build GUI dependencies." ON)`. 4. Build twice to create libwallet_merged.a in addition to other .a libraries: `make release-static -j8`. 5. Copy .a files from ./submodules/monero-core/build/release/* to ./external-libs/monero-core according to CMakeLists.txt. 4. Set up hidapi 1. Download the latest hidapi source code from https://github.com/signal11/hidapi. 2. Build hidapi for your system.
Mac requires autoreconf: `brew install automake` 3. Copy libhidapi.a to ./external-libs/hidapi. 5. Set up libsodium 1. Build libsodium for your system. 2. Copy libsodium.a to ./external-libs/libsodium.
Mac: installed through homebrew at /usr/local/Cellar/libsodium/1.0.17/lib/libsodium.a After the dependencies are set up, this project may be compiled as part of another application, as a dynamic library, or as a shared library. For example, the associated [Java library](https://github.com/monero-ecosystem/monero-java-rpc) depends on a dynamic library built from this project to support a wallet using Java JNI. To build this project as a dynamic library at `./build/libmonero-cpp.dylib`, execute: `./bin/build-libmonero-cpp.sh`. These build steps aspire to be automated further and [any help is greatly appreciated](https://github.com/woodser/monero-cpp-library/issues/1). ## See Also These libraries conform to the same [API specification](http://moneroecosystem.org/monero-java/monero-spec.pdf). [Java reference implementation](https://github.com/monero-ecosystem/monero-java-rpc) [JavaScript reference implementation](https://github.com/monero-ecosystem/monero-javascript) ## License This project is licensed under MIT. ## Donate Donations are gratefully accepted. Thank you for your support!

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