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15_2_Programming_Bitcoind_with_C.md
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@ -241,7 +241,7 @@ params = json_array();
json_array_append(params,inputparams); json_array_append(params,inputparams);
json_array_append(params,outputparams); json_array_append(params,outputparams);
``` ```
#### 6.4 Make the RPC Call #### Step 6.4 Make the RPC Call
Use the normal method to create your RPC call: Use the normal method to create your RPC call:
``` ```
@ -264,7 +264,7 @@ lu_result = json_object_get(lu_response,"result");
char *tx_rawhex = strdup(json_string_value(lu_result)); char *tx_rawhex = strdup(json_string_value(lu_result));
``` ```
### 7. Sign the Transaction ### Step 7. Sign the Transaction
It's a lot easier to assign a simple parameter to a function. You just create a JSON array, then assign the parameter to the array: It's a lot easier to assign a simple parameter to a function. You just create a JSON array, then assign the parameter to the array:
``` ```
@ -295,7 +295,7 @@ json_decref(lu_signature);
> :warning: ***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. > :warning: ***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.
### 8. Send the Transaction ### Step 8. Send the Transaction
You can now send your transaction, using all of the previous techniques: You can now send your transaction, using all of the previous techniques:
``` ```
@ -322,7 +322,7 @@ printf("Txid: %s\n",tx_newid);
``` ```
The entire code, with a _little_ more error-checking appears in the Appendix. The entire code, with a _little_ more error-checking appears in the Appendix.
### Testing Your Code ## Testing Your Code
The complete code can be found in the [src directory](src/15_2_sendtoaddress.c). The complete code can be found in the [src directory](src/15_2_sendtoaddress.c).
@ -337,3 +337,11 @@ You can then use it to send funds to an address:
Txid: b93b19396f8baa37f5f701c7ca59d3128144c943af5294aeb48e3eb4c30fa9d2 Txid: b93b19396f8baa37f5f701c7ca59d3128144c943af5294aeb48e3eb4c30fa9d2
``` ```
You can see information on this transaction that we sent [here](https://live.blockcypher.com/btc-testnet/tx/b93b19396f8baa37f5f701c7ca59d3128144c943af5294aeb48e3eb4c30fa9d2/). You can see information on this transaction that we sent [here](https://live.blockcypher.com/btc-testnet/tx/b93b19396f8baa37f5f701c7ca59d3128144c943af5294aeb48e3eb4c30fa9d2/).
## Summary: Programming Bitcoind with C
With access to a C library, you can create much more fully featured programs than it was reasonable to do so with shell scripts. But, it can take a lot of work! Even at 316 lines of code, `sendtoaddress.c` doesn't cover nearly all of the intricacies requires to safely and intelligently transact bitcoins.
## What's Next?
Learn more about "Talking to Bitcoind with C" in [15.3: Receiving Bitcoind Notifications with C](15_3_Receiving_Bitcoind_Notifications_with_C.md).