How to start with IOTA application - blockchain

Question

i want to develop an IOTA application, but not a messaging application or coin based system. I want an simple example of how to store data in IOTA. For example i want to build an SCM or even an simple login/registration app. Can anyone guide me? Any sample application? i try to run https://github.com/domschiener/leaderboard-example But getting same error like https://github.com/domschiener/leaderboard-example/issues/6 How to run this.

Answer 1

Storing text data on the tangle is not that difficult. The following are snippets from my tangle-based app. I used IOTA's API Java wrapper library Jota.
1) Connect to IOTA node. You can find a list of nodes here https://nodes.iota.works. Also you can set up your own full node and use it instead of an external one.
final String protocol = "https";
final String url = "tuna.iotasalad.org";
final String port = "14265";
IotaAPI iotaServer = new IotaAPI.Builder().protocol(protocol).host(host).port(port).build();
2) Covert your text into trytes
String trytes = TrytesConverter.toTrytes("my text");
3) Prepare and send transaction to tangle
private static final String SEED = "IHDEENZYITYVYSPKAURUZAQKGVJERUZDJMYTANNZZGPZ9GKWTEOJJ9AAMXOGZNQLSNMFDSQOTZAEETA99";//just a random one
private static final int MIN_WEIGHT_MAGNITUDE = 14;
private static final int DEPTH = 9;
private static final int TAG = "mytag"; //optional
String tangleHash = prepareTransfer(createAddress(), trytes);
public String createAddress() throws ArgumentException {
GetNewAddressResponse res = iotaServer.getNewAddress(SEED, 2, 0, false, 1, false);
return res.getAddresses().get(0);
}
public String prepareTransfer(String address_seclevel_2, String trytes) throws ArgumentException {
List<Transfer> transfers = new ArrayList<Transfer>();
transfers.add(new Transfer(address_seclevel_2, 0, trytes, TAG));
SendTransferResponse str = iotaServer.sendTransfer(SEED, 2, DEPTH, MIN_WEIGHT_MAGNITUDE, transfers, null,
null, false, false);
if(str.getSuccessfully()!=null){
//Transfer successfully!
for(Transaction tx: str.getTransactions()) {
return tx.getHash();
}
}
return "Handle error here. Something went wrong!";
}