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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
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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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@ -91,30 +91,30 @@ int i;
const char *tx_id = 0; const char *tx_id = 0;
int tx_vout = 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++) { for (i = 0 ; i < json_array_size(lu_result) ; i++) {
json_t *lu_data = NULL; json_t *lu_data = NULL;
lu_data = json_array_get(lu_result, i); lu_data = json_array_get(lu_result, i);
json_t *lu_amount = NULL; json_t *lu_value = NULL;
lu_amount = json_object_get(lu_data,"amount"); lu_value = json_object_get(lu_data,"amount");
tx_amount = json_real_value(lu_amount); tx_value = json_real_value(lu_value);
``` ```
Is the UTXO large enough to pay out your transaction? If so, grab it! 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; json_t *lu_txid = NULL;
lu_txid = json_object_get(lu_data,"txid"); lu_txid = json_object_get(lu_data,"txid");
tx_id = strdup(json_string_value(lu_txid)); tx_id = strdup(json_string_value(lu_txid));
json_t *lu_vout = NULL; json_t *lu_vout = NULL;
lu_vout = json_object_get(lu_data,"vout"); lu_vout = json_object_get(lu_data,"vout");
tx_vout = json_integer_value(lu_vout); tx_vout = json_integer_value(lu_vout);
json_decref(lu_amount); json_decref(lu_value);
json_decref(lu_txid); json_decref(lu_txid);
json_decref(lu_vout); json_decref(lu_vout);
json_decref(lu_data); 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: 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); 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); printf("Very Sad: You don't have any UTXOs larger than %f",tx_total);
exit(-1); 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. > **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.