0
I am relatively new to C++ and I was wondering if anybody could help me out. I am looking piece of code that will loop until a block is found by a node and then when one is found print a simple output like "Block found".
Thanks!
What piece of code would allow me to check if a block has been found then run an operation?
Answers
1
You could simply record the value of bitcoind getblockcount somewhere and see when that changes by calling getblockcount repeatedly.
1If I was running bitcoind, personally I would enable the blocknotify config setting and do away with the repetitive polling. – ChrisW – 2014-04-23T22:22:23.337
-1
#include <string>
#include <iostream>
#include <stdio.h>
std::string exec(char* cmd) {
FILE* pipe = popen(cmd, "r");
if (!pipe) return "ERROR";
char buffer[128];
std::string result = "";
while(!feof(pipe)) {
if(fgets(buffer, 128, pipe) != NULL)
result += buffer;
}
pclose(pipe);
return result;
}
int main(){
int count;
count = stoi(exec("bitcoind getblockcount"));
for(;;){
int new_count = stoi(exec("bitcoind getblockcount"));
while(count < new_count){
std::cout << "Block found." << std::endl;
count++;
}
system("sleep 1"); // There are other ways of sleeping. This is the quick and dirty way.
}
return 0;
}
To be fair, this is a rip off of Luca's idea and https://stackoverflow.com/questions/478898/how-to-execute-a-command-and-get-output-of-command-within-c.
Is C++ really a requirement for this? I'm an avid C++ programmer myself and I would not want to do this in C++. And alternative would be python or even bash. Also, what OS are you targeting? – Tyler – 2014-04-23T21:19:41.020