League Ping

league_ping.cpp

#include <stdio.h>
#include <string>
#include <assert.h>
#include <stdlib.h>
#include <iostream>
#include <sstream>
#include <vector>

using namespace std;

// src: http://stackoverflow.com/questions/478898/how-to-execute-a-command-and-get-output-of-command-within-c-using-posix/478960
std::string exec(const char* cmd) {
	char buffer[128];
	std::string result = "";
	FILE* pipe = _popen(cmd, "r");
	if (!pipe) throw std::runtime_error("popen() failed!");
	try {
		while (!feof(pipe)) {
			if (fgets(buffer, 128, pipe) != NULL)
				result += buffer;
		}
	}
	catch (...) {
		_pclose(pipe);
		throw;
	}
	_pclose(pipe);
	return result;
}

// src: http://stackoverflow.com/questions/30073839/c-extract-number-from-the-middle-of-a-string/30074453
std::string first_numberstring(std::string const & str)
{
	std::size_t const n = str.find_first_of("0123456789");
	if (n != std::string::npos)
	{
		std::size_t const m = str.find_first_not_of("0123456789", n);
		return str.substr(n, m != std::string::npos ? m - n : m);
	}
	return std::string();
}

// src: http://stackoverflow.com/questions/13172158/c-split-string-by-line
std::vector<std::string> split_string(const std::string& str, const std::string& delimiter)
{
	std::vector<std::string> strings;
	std::string::size_type pos = 0;
	std::string::size_type prev = 0;
	while ((pos = str.find(delimiter, prev)) != std::string::npos)
	{
		if (!str.substr(prev, pos - prev).empty()) {
			strings.push_back(str.substr(prev, pos - prev));
		}
		prev = pos + 1;
	}
	// To get the last substring (or only, if delimiter is not found)
	strings.push_back(str.substr(prev));
	return strings;
}

int main(int argc, char** argv) {
	const char* old_euw = "ping 185.40.65.1";
	const char* euw = "ping 104.160.141.3";
	const char* na = "ping 104.160.131.3";
	const char* eune = "ping 104.160.142.3";
	const char* oce = "ping 104.160.156.1";
	const char* lan = "ping 104.160.136.3";

	cout << " ------==[ League Connection Tool by oO dee1337 Oo from EUW }==------" << endl;
	int choice = -1;
	while (true) {
		cout << "Select your server: \n\tEUW[1] | NA[2] | EUNE[3] | OCE[4] | LAN[5] " << endl;
		cin >> choice;
		if (choice == 2) { euw = na; break; }
		else if (choice == 3) { euw = eune; break; }
		else if (choice == 4) { euw = oce; break; }
		else if (choice == 5) { euw = lan; break; }
		else if (choice == 1) { break; }
	}

	cout << "Please be patient for measurements..." << endl;
	auto strings = split_string(exec(euw), "\n");

	int x = 0;
	auto itr = strings.begin();
	for (itr = strings.begin(); itr != strings.end() - 1; itr++)
		x++;

	std::string line = strings[x - 1]; // THE LAST LINE ONLY

	// SPLIT THE LAST LINE into 3 comma seperated items:
	auto arr = split_string(line, ",");

	int min = -1;
	int max = -1;
	int mean = -1;

	string a = first_numberstring(arr[0]);
	string b = first_numberstring(arr[1]);
	string c = first_numberstring(arr[2]);

	if (a.empty()) { return -1; }

	min = std::stoi(a);
	max = std::stoi(b);
	mean = std::stoi(c);
	cout << "min|max|mean ping during test: " << min << "|" << max << "|" << mean << endl;

	// min-max delta shouldn't be to big -> else unstable 
	if ((max - min) > 50 || (min - max) > 50) {
		cout << "You have an unstable connection\n Maybe try the reset tool in the end" << endl;
		return 0;
	}

	if (mean > 150) {
		cout << "Your ping is " << mean << " -> you should not play league now!" << endl;
	}
	if (110 < mean && mean < 150) {
		cout << "Your ping is not optimal (" << mean << "ms) but you can play league to some extend" << endl;
	}
	if (70 < mean && mean < 100) {
		cout << "Your ping is ok (" << mean << "ms), you can play league without ping problems" << endl;
	}
	if (0 < mean && mean < 70) {
		cout << "Your ping is perfect (" << mean << "ms), get a penta!" << endl;
	}
	cout << "finished results, ty for waiting\n\n" << endl;


	/* user input */
	int input = -1;
	cout << "Do you want to use the Connection Reset Tool to reset your Network Settings?\n(it will flush/release and renew your ipconfig) -> this will not harm your network" << endl;
	cout << "press 1 to do so or any other key to leave" << endl;
	cin >> input;
	if (input == 1) {
		cout << "Resetting Your IP Configuration:" << endl;
		cout << "flushing dns..." << endl;
		exec("ipconfig /flushdns");
		cout << "releasing ipconfig..." << endl;
		exec("ipconfig /release");
		cout << "renewing ipconfig..." << endl;
		exec("ipconfig /renew");
		cout << "\nCool, that's it\n" << endl;
	}
	cout << "...press a key to close this window." << endl;
	cin >> input;
	return 0;
}

Nice thing you got there. I'd have some minor things you could change:
-you could consider using a switch statement instead of your while loop in line 71
-you can replace lines 84-89 with std::string line = strings[strings.size() - 2]; there is no need to iterate over the whole vector
-you can replace lines 145-146 with a simple system("pause")

Kind regards,
some programming scrub

@imkreislaufen:
thank you for feedback, actually this was a fast quick-and-dirty code :)

• i didnt't use switch, because i want people to stay within the loop as long as they don't put in the right choice
• 84-89 can really be changed, i had it just for debugging in the beginning and was to lazy to cut it
• system("pause") somehow somtimes did not work everytime for some weird reason (had i before), that's why i went back to the cin version.