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Update 12_3_Programming_Bitcoind_with_C.md

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Shannon Appelcline 2017-06-28 10:22:33 -07:00 committed by GitHub
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12_3_Programming_Bitcoind_with_C.md
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@ -295,3 +295,32 @@ json_decref(lu_signature);
> ***WARNING:*** A real-world program would obviously carefully test the response of every RPC command to make sure there were no errors. That's especially true for `signrawtransaction`, because you might end up with a partially signed transaction. Worse, if you don't check the errors in the JSON object, you'll just see the `hex` and not realize that it's either unsigned or partially signed.
### 7. Send the Transaction
You can now send your transaction, using all of the previous techniques:
```
params = json_array();
json_array_append_new(params,json_string(tx_signrawhex));
rpc_method = bitcoinrpc_method_init(BITCOINRPC_METHOD_SENDRAWTRANSACTION);
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);
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);
```
The entire code, with a _little_ more error-checking appears in the Appendix.
## Summary: Programming Bitcoind with C
Using the techniques outlined in [§12.2](12_2_Accessing_Bitcoind_with_C.md) you can write a much more complex program using C calls. This section offers an example, with the first cut of a program that will send money to an address, without your users worrying about where it's coming from, how much they're paying as a fee, or how they get their change back. Obviously, a real-world program would need much better user-input control and error handling, but by outlining how the RPC code works, this section opens up the programming doorways to allow you to take the next step.