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Update 12_3_Programming_Bitcoind_with_C.md

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Shannon Appelcline 2017-06-21 11:44:46 -07:00 committed by GitHub
parent 3fca26c40b
commit 49ec05bd7d
1 changed files with 8 additions and 10 deletions
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12_3_Programming_Bitcoind_with_C.md
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@ -91,20 +91,20 @@ int i;
const char *tx_id = 0;
int tx_vout = 0;
double tx_amount = 0.0;
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_amount = NULL;
lu_amount = json_object_get(lu_data,"amount");
tx_amount = json_real_value(lu_amount);
json_t *lu_value = NULL;
lu_value = json_object_get(lu_data,"amount");
tx_value = json_real_value(lu_value);
```
Is the UTXO large enough to pay out your transaction? If so, grab it!
```
if (tx_amount > tx_total) {
if (tx_value > tx_total) {
json_t *lu_txid = NULL;
lu_txid = json_object_get(lu_data,"txid");
@ -114,7 +114,7 @@ Is the UTXO large enough to pay out your transaction? If so, grab it!
lu_vout = json_object_get(lu_data,"vout");
tx_vout = json_integer_value(lu_vout);
json_decref(lu_amount);
json_decref(lu_value);
json_decref(lu_txid);
json_decref(lu_vout);
json_decref(lu_data);
@ -124,7 +124,7 @@ Is the UTXO large enough to pay out your transaction? If so, grab it!
```
Make sure to clean things up as you go through failed loops and then when you finish the loops:
```
json_decref(lu_amount);
json_decref(lu_value);
json_decref(lu_data);
}
@ -139,8 +139,6 @@ if (!tx_id) {
printf("Very Sad: You don't have any UTXOs larger than %f",tx_total);
exit(-1);
}
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.