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16_2_sendtoaddress.c
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16_2_sendtoaddress.c
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#include <jansson.h>
#include <bitcoinrpc.h>
#include <string.h>
int main(int argc, char *argv[]) {
/* 1. Request an Address and an Amount */
if (argc != 3) {
printf("ERROR: Only %i arguments! Correct usage is '%s [recipient] [amount]'\n",argc-1,argv[0]);
exit(-1);
}
char *tx_recipient = argv[1];
double tx_amount = atof(argv[2]);
/* 2. Set an Arbitrary Fee */
double tx_fee = 0.0005;
double tx_total = tx_amount + tx_fee;
/* 3. Prepare Your RPC */
bitcoinrpc_cl_t *rpc_client;
bitcoinrpc_method_t *rpc_method = NULL;
bitcoinrpc_resp_t *btcresponse = NULL;
bitcoinrpc_err_t btcerror;
json_t *lu_response = NULL;
json_t *lu_result = NULL;
bitcoinrpc_global_init();
rpc_client = bitcoinrpc_cl_init_params ("bitcoinrpc", "YOUR-RPC-PASSWD", "127.0.0.1", 18332);
if (rpc_client) {
/* 4. Find a UTXO */
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_LISTUNSPENT);
if (!rpc_method) {
printf("ERROR: Unable to initialize listunspent method!\n");
exit(-1);
}
btcresponse = bitcoinrpc_resp_init();
if (!btcresponse) {
printf("Error: Cannot initialize response object!");
exit(-1);
}
bitcoinrpc_call(rpc_client, rpc_method, btcresponse, &btcerror);
if (btcerror.code != BITCOINRPCE_OK) {
printf("Error: listunspent error code %d [%s]\n", btcerror.code,btcerror.msg);
exit(-1);
}
lu_response = bitcoinrpc_resp_get (btcresponse);
lu_result = json_object_get(lu_response,"result");
int i;
const char *tx_id = 0;
int tx_vout = 0;
double tx_value = 0.0;
for (i = 0 ; i < json_array_size(lu_result) ; i++) {
json_t *lu_data = NULL;
lu_data = json_array_get(lu_result, i);
json_t *lu_value = NULL;
lu_value = json_object_get(lu_data,"amount");
tx_value = json_real_value(lu_value);
if (tx_value > tx_total) {
json_t *lu_txid = NULL;
lu_txid = json_object_get(lu_data,"txid");
tx_id = strdup(json_string_value(lu_txid));
json_t *lu_vout = NULL;
lu_vout = json_object_get(lu_data,"vout");
tx_vout = json_integer_value(lu_vout);
json_decref(lu_value);
json_decref(lu_txid);
json_decref(lu_vout);
json_decref(lu_data);
break;
}
}
json_decref(lu_result);
json_decref(lu_response);
if (!tx_id) {
printf("Very Sad: You don't have any UTXOs larger than %f\n",tx_total);
exit(-1);
}
bitcoinrpc_method_free(rpc_method);
/* 5. Create a Change Address */
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_GETRAWCHANGEADDRESS);
if (!rpc_method) {
printf("ERROR: Unable to initialize createrawchangeaddress method!\n");
exit(-1);
}
bitcoinrpc_call(rpc_client, rpc_method, btcresponse, &btcerror);
if (btcerror.code != BITCOINRPCE_OK) {
printf("Error: createrawchangeaddress error code %d [%s]\n", btcerror.code, btcerror.msg);
exit(-1);
}
lu_response = bitcoinrpc_resp_get (btcresponse);
lu_result = json_object_get(lu_response,"result");
char *changeaddress = strdup(json_string_value(lu_result));
json_decref(lu_result);
json_decref(lu_response);
bitcoinrpc_method_free(rpc_method);
/* 6. Create a Raw Transaction */
/* 6.1. Create the Input Parameters */
json_t *inputtxid = NULL;
inputtxid = json_object();
json_object_set_new(inputtxid,"txid",json_string(tx_id));
json_object_set_new(inputtxid,"vout",json_integer(tx_vout));
json_t *inputparams = NULL;
inputparams = json_array();
json_array_append(inputparams,inputtxid);
/* 6.2 Create the Output Parameters */
json_t *outputparams = NULL;
outputparams = json_object();
char tx_amount_string[32];
sprintf(tx_amount_string,"%.8f",tx_amount);
char tx_change_string[32];
sprintf(tx_change_string,"%.8f",tx_value - tx_total);
json_object_set(outputparams,
tx_recipient,
json_string(tx_amount_string));
json_object_set(outputparams,
changeaddress,
json_string(tx_change_string));
/* 6.3 Create the Parameter Array */
json_t *params = NULL;
params = json_array();
json_array_append(params,inputparams);
json_array_append(params,outputparams);
/* 6.4 Make the RPC Call */
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_CREATERAWTRANSACTION);
if (!rpc_method) {
printf("ERROR: Unable to initialize createrawtransaction method!\n");
exit(-1);
}
if (bitcoinrpc_method_set_params(rpc_method, params) != BITCOINRPCE_OK) {
fprintf (stderr, "Error: Could not set params for createrawtransaction");
}
json_decref(inputtxid);
json_decref(inputparams);
json_decref(outputparams);
json_decref(params);
bitcoinrpc_call(rpc_client, rpc_method, btcresponse, &btcerror);
if (btcerror.code != BITCOINRPCE_OK) {
printf("Error: createrawtransaction error code %d [%s]\n", btcerror.code,btcerror.msg);
exit(-1);
}
lu_response = bitcoinrpc_resp_get(btcresponse);
lu_result = json_object_get(lu_response,"result");
char *tx_rawhex = strdup(json_string_value(lu_result));
json_decref(lu_result);
json_decref(lu_response);
bitcoinrpc_method_free(rpc_method);
/* 7. Sign the Transaction */
params = json_array();
json_array_append_new(params,json_string(tx_rawhex));
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_SIGNRAWTRANSACTION);
if (!rpc_method) {
printf("ERROR: Unable to initialize signrawtransaction method!\n");
exit(-1);
}
if (bitcoinrpc_method_set_params(rpc_method, params) != BITCOINRPCE_OK) {
fprintf (stderr, "Error: Could not set params for signrawtransaction");
}
json_decref(params);
bitcoinrpc_call(rpc_client, rpc_method, btcresponse, &btcerror);
if (btcerror.code != BITCOINRPCE_OK) {
printf("Error: signrawtransaction error code %d [%s]\n", btcerror.code,btcerror.msg);
exit(-1);
}
lu_response = bitcoinrpc_resp_get(btcresponse);
lu_result = json_object_get(lu_response,"result");
json_t *lu_signature = json_object_get(lu_result,"hex");
char *tx_signrawhex = strdup(json_string_value(lu_signature));
json_decref(lu_signature);
json_decref(lu_result);
json_decref(lu_response);
bitcoinrpc_method_free(rpc_method);
/* 8. Send the Transaction */
params = json_array();
json_array_append_new(params,json_string(tx_signrawhex));
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_SENDRAWTRANSACTION);
if (!rpc_method) {
printf("ERROR: Unable to initialize sendrawtransaction method!\n");
exit(-1);
}
if (bitcoinrpc_method_set_params(rpc_method, params) != BITCOINRPCE_OK) {
fprintf (stderr, "Error: Could not set params for sendrawtransaction");
}
json_decref(params);
bitcoinrpc_call(rpc_client, rpc_method, btcresponse, &btcerror);
if (btcerror.code != BITCOINRPCE_OK) {
printf("Error: endrawtransaction error code %d [%s]\n", btcerror.code,btcerror.msg);
exit(-1);
}
lu_response = bitcoinrpc_resp_get(btcresponse);
lu_result = json_object_get(lu_response,"result");
char *tx_newid = strdup(json_string_value(lu_result));
printf("Txid: %s\n",tx_newid);
json_decref(lu_result);
json_decref(lu_response);
bitcoinrpc_method_free(rpc_method);
} else {
printf("ERROR: Failed to connect to server!\n");
}
bitcoinrpc_cl_free(rpc_client);
bitcoinrpc_global_cleanup();
}