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Update 12_3_Programming_Bitcoind_with_C.md

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Shannon Appelcline 2017-06-21 11:06:45 -07:00 committed by GitHub
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12_3_Programming_Bitcoind_with_C.md
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@ -146,3 +146,34 @@ printf("We are using txid %s with vout %i\n",tx_id,tx_vout);
> **WARNING:** A real program would use subroutines for this sort of lookup, so that you could confidentally call various RPCs from a library of C functions. We're just going to blob it all into `main` as part of our KISS philosophy of simple examples.
### 4. Create a Change Address
Repeat this methodology to get a change address:
```
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_GETRAWCHANGEADDRESS);
if (!rpc_method) {
printf("ERROR: Unable to initialize listunspent method!\n");
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");
char *changeaddress = strdup(json_string_value(lu_result));
```
The only difference is what in particular we extract from our JSON object.
> **WARNING:** Here's another place that a subroutine would be really nice: to abstract out the whole RPC method initialization and call.
### 5. Create a Raw Transaction