Monero C++ Library

A C++ library for creating Monero applications using native bindings to monero v0.18.1.2 'Flourine Fermie'.

Supports fully client-side wallets by wrapping wallet2.h.
Supports multisig, view-only, and offline wallets.
Uses a clearly defined data model and API specification intended to be intuitive and robust.
Query wallet transactions, transfers, and outputs by their properties.
Receive notifications when wallets sync, send, or receive.
Tested by over 100 tests in monero-java and monero-javascript using JNI and WebAssembly bindings.

Sample code

// 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_full::create_wallet_from_mnemonic(
    "MyWalletRestored",                   // wallet path and name
    "supersecretpassword123",             // wallet password
    monero_network_type::STAGENET,        // network type
    mnemonic,                             // mnemonic phrase
    monero_rpc_connection(                // daemon connection
        string("http://localhost:38081"),
        string("superuser"),
        string("abctesting123")),
    380104,                               // restore height
    ""                                    // seed offset
);

// synchronize the wallet and receive progress notifications
struct : monero_wallet_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 hash
monero_tx_query tx_query;
tx_query.m_hash = "314a0f1375db31cea4dac4e0a51514a6282b43792269b3660166d4d2b46437ca";
shared_ptr<monero_tx_wallet> tx = wallet_restored->get_txs(tx_query)[0];
for (const shared_ptr<monero_transfer> transfer : tx->get_transfers()) {
  bool is_incoming = transfer->is_incoming().get();
  uint64_t in_amount = transfer->m_amount.get();
  int account_index = 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<shared_ptr<monero_transfer>> transfers = wallet_restored->get_transfers(transfer_query);

// query unspent outputs
monero_output_query output_query;
output_query.m_is_spent = false;
vector<shared_ptr<monero_output_wallet>> outputs = wallet_restored->get_outputs(output_query);

// create and sync a new wallet with a random mnemonic phrase
monero_wallet* wallet_random = monero_wallet_full::create_wallet_random(
    "MyWalletRandom",                     // wallet path and name
    "supersecretpassword123",             // wallet password
    monero_network_type::STAGENET,        // network type
    monero_rpc_connection(                // daemon connection
        string("http://localhost:38081"),
        string("superuser"),
        string("abctesting123")),
    "English");
wallet_random->sync();

// synchronize in the background every 5 seconds
wallet_random->start_syncing(5000);

// 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();

// receive notifications when funds are received, confirmed, and unlocked
struct : monero_wallet_listener {
  void on_output_received(const monero_output_wallet& output) {
    cout << "Wallet received funds!" << endl;
    uint64_t amount = output.m_amount.get();
    string tx_hash = output.m_tx->m_hash.get();
    bool is_confirmed = output.m_tx->m_is_confirmed.get();
    bool is_locked = dynamic_pointer_cast<monero_tx_wallet>(output.m_tx)->m_is_locked.get();
    int account_index = output.m_account_index.get();
    int subaddress_index = output.m_subaddress_index.get();
    FUNDS_RECEIVED = true;
  }
} my_listener;
wallet_random->add_listener(my_listener);

// send funds from the restored wallet to the random wallet
monero_tx_config config;
config.m_account_index = 0;
config.m_address = wallet_random->get_address(1, 0);
config.m_amount = 50000;
config.m_relay = true;
shared_ptr<monero_tx_wallet> sent_tx = wallet_restored->create_tx(config);
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 config to send funds to multiple destinations in the random wallet
config = monero_tx_config();
config.m_account_index = 1;                // withdraw funds from this account
config.m_subaddress_indices = vector<uint32_t>();
config.m_subaddress_indices.push_back(0);
config.m_subaddress_indices.push_back(1);  // withdraw funds from these subaddresses within the account
config.m_priority = monero_tx_priority::UNIMPORTANT;  // no rush
config.m_relay = false;  // create transaction and relay to the network if true
vector<shared_ptr<monero_destination>> destinations;  // specify the recipients and their amounts
destinations.push_back(make_shared<monero_destination>(wallet_random->get_address(1, 0), 50000));
destinations.push_back(make_shared<monero_destination>(wallet_random->get_address(2, 0), 50000));
config.m_destinations = destinations;

// create the transaction, confirm with the user, and relay to the network
shared_ptr<monero_tx_wallet> created_tx = wallet_restored->create_tx(config);
uint64_t fee = created_tx->m_fee.get(); // "Are you sure you want to send ...?"
wallet_restored->relay_tx(*created_tx); // recipient receives notification within 5 seconds

// save and close the wallets
wallet_restored->close(true);
wallet_random->close(true);

Documentation

API documentation
API and model overview with visual diagrams
monero-javascript documentation provides additional documentation which translates to monero-cpp

Using this library in your project

This project may be compiled as part of another application or built as a shared or static library.

For example, monero-java compiles this project to a shared library to support Java JNI bindings, while monero-javascript compiles this project to WebAssembly binaries.

Building monero-cpp on Mac & Linux

If building this library standalone instead of as a submodule in another project, clone the project repository and update its submodules:
1. git clone --recurse-submodules https://github.com/monero-ecosystem/monero-cpp.git
2. cd ./monero-cpp && ./bin/update_submodules.sh

Install monero-project dependencies for your system. For example, on Ubuntu:

sudo apt update && sudo apt install build-essential cmake pkg-config libssl-dev libzmq3-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libpgm-dev qttools5-dev-tools libhidapi-dev libusb-1.0-0-dev libprotobuf-dev protobuf-compiler libudev-dev libboost-chrono-dev libboost-date-time-dev libboost-filesystem-dev libboost-locale-dev libboost-program-options-dev libboost-regex-dev libboost-serialization-dev libboost-system-dev libboost-thread-dev python3 ccache

Install expat (dependency of unbound):

cd ~
wget https://github.com/libexpat/libexpat/releases/download/R_2_4_8/expat-2.4.8.tar.bz2
tar -xf expat-2.4.8.tar.bz2
sudo rm expat-2.4.8.tar.bz2
cd expat-2.4.8
./configure --enable-static --disable-shared
make
sudo make install
cd ../

Install unbound:

cd ~
wget https://www.nlnetlabs.nl/downloads/unbound/unbound-1.17.0.tar.gz
tar xzf unbound-1.17.0.tar.gz
sudo apt update
sudo apt install -y build-essential
sudo apt install -y libssl-dev
sudo apt install -y libexpat1-dev
sudo apt-get install -y bison
sudo apt-get install -y flex
cd unbound-1.17.0
./configure --with-libexpat=/usr --with-ssl=/usr
make
sudo make install
cd ../

export MONERO_CPP=path/to/monero-cpp
cd $MONERO_CPP/external/monero-project
Build monero-project to create .a libraries, e.g.: make release-static -j8
Link to this library's source files in your application or build as a shared library in ./build/: cd $MONERO_CPP && ./bin/build_libmonero_cpp.sh

Building libmonero-cpp.dll on Windows

Download and install MSYS2.
Press the Windows button and launch MSYS2 MINGW64 for 64 bit systems or MSYS2 MINGW32 for 32 bit.
Update packages: pacman -Syu and pacman -Syy

Relaunch MSYS2 (if necessary) and install dependencies:

For 64 bit:

pacman -S mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-openssl mingw-w64-x86_64-zeromq mingw-w64-x86_64-libsodium mingw-w64-x86_64-hidapi mingw-w64-x86_64-unbound mingw-w64-x86_64-protobuf git mingw-w64-x86_64-libusb make gettext base-devel

For 32 bit:

pacman -S  mingw-w64-i686-toolchain make mingw-w64-i686-cmake mingw-w64-i686-boost mingw-w64-i686-openssl mingw-w64-i686-zeromq mingw-w64-i686-libsodium mingw-w64-i686-hidapi mingw-w64-i686-unbound mingw-w64-i686-protobuf git mingw-w64-i686-libusb make gettext base-devel

Clone repo if installing standalone (skip if building as part of another repo like monero-java or monero-javascript): git clone --recursive https://github.com/monero-ecosystem/monero-cpp.git
Update submodules: cd <path/to/monero-cpp> && ./bin/update_submodules.sh
cd ./external/monero-project
Build monero-project:

For 64 bit: make release-static-win64

For 32 bit: make release-static-win32
Build as a shared library in ./build/: cd ../../ && ./bin/build_libmonero_cpp_dll.sh

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License

This project is licensed under MIT.

Donations

If this library brings you value, please consider donating.

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