boost address_v4::from_string() 崩溃

Question

当我传递空字符串或无效地址时，address_v4::from_string() 崩溃

address_v4 address = address_v4::from_string("");

boost 版本:1_53

Answer 1

它实际上并没有崩溃。它只是抛出一个异常，如记录:

#include <boost/asio.hpp>
#include <iostream>

int main() {
    try {
    auto address = boost::asio::ip::address_v4::from_string("");
    } catch(std::exception const& e) {
        std::cout << e.what() << "\n";
    }
}

打印“无效参数”。那是因为论证不成立。 ""不是有效地址。

无一异常(exception)

您可以选择使用 error_code 的重载。避免抛出异常:

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#include <boost/asio.hpp>
#include <iostream>

int main() {
    boost::system::error_code ec;
    auto address = boost::asio::ip::address_v4::from_string("", ec);
    if (!ec)
        std::cout << "Address: " << address << '\n';
    else
        std::cout << "Error: " << ec.message();
}