以下代码:
function myFontStyle() {
$('#font').on("change", function() {
var fontChange = this.value
console.log(this.value);
$('h1').attr('class', fontChange);
});
}
myFontStyle();
使用Xcode 9.1在OS X High Sierra上运行时,会导致以下错误:
using boost::asio::ip::tcp;
std::string ipAddress;
boost::asio::io_service io_service;
tcp::resolver resolver(io_service);
tcp::resolver::query query(boost::asio::ip::host_name(), "");
tcp::resolver::iterator iter = resolver.resolve(query);
std::runtime_error: resolve: Host not found (authoritative)
的值为:
resolver
,(boost::asio::ip::tcp::resolver) resolver = {
boost::asio::basic_io_object<boost::asio::ip::resolver_service<boost::asio::ip::tcp>, false> = {
service = 0x00000001023159a0
implementation = nullptr {
__ptr_ = 0x0000000000000000
__cntrl_ = 0x00000001023156c0
}
}
}
的值为:
query
(boost::asio::ip::basic_resolver<boost::asio::ip::tcp, boost::asio::ip::resolver_service<boost::asio::ip::tcp> >::query) query = {
hints_ = {
ai_flags = 1024
ai_family = 0
ai_socktype = 1
ai_protocol = 6
ai_addrlen = 0
ai_canonname = 0x0000000000000000
ai_addr = 0x0000000000000000
ai_next = 0x0000000000000000
}
host_name_ = "iMac.local"
service_name_ = ""
}
函数如下所示:
resolve
所以我可以看到调用iterator resolve(const query& q)
{
boost::system::error_code ec;
iterator i = this->service.resolve(this->implementation, q, ec);
boost::asio::detail::throw_error(ec, "resolve");
return i;
}
resolve
为resolver.implementation
是导致问题的原因。但是,我不知道为什么它是nullptr
。
在运行OS X Yosemite或El Capitan的不同计算机上,这不是问题。
答案 0 :(得分:1)
发布答案以防其他人遇到相同问题并最终结束。
最后想出来了,部分归功于 一些程序员家伙 询问ping主机然后根据ping失败的事实进行搜索。
此帖子https://discussions.apple.com/thread/7707202?start=0&tstart=0表示由于某种原因。除非任何共享服务处于活动状态,否则.local主机名将保持关闭状态。
打开它们可以解决问题。