[英]VK API throught C++ Boost
如何打開用於連接VK API的套接字,此代碼可與其他資源很好地配合使用,但可通過api.vk.com
提供APPCRASH
。 在瀏覽器中,它可以與http
,因此應該在這里使用,問題不在'http`中,還是我錯了? 救命!
PS:Boost和VK API是我的新手,所以,如果可以的話,請詳細解釋,謝謝。
int main()
{
boost::asio::io_service io_service;
// Get a list of endpoints corresponding to the server name.
tcp::resolver resolver(io_service);
tcp::resolver::query query("api.vk.com", "http");
tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
// Try each endpoint until we successfully establish a connection.
tcp::socket socket(io_service);
boost::system::error_code error = boost::asio::error::host_not_found;
socket.connect(*endpoint_iterator, error);
return 0;
}
看起來APPCRASH
可能是您在Windows事件日志中看到的東西。
由此,我形成了一個假設,即您可能正在Windows服務上下文中運行此代碼。
Windows服務默認情況下沒有網絡訪問權限。
這意味着DNS查找可能會失敗。 您將獲得一個例外,例如, resolve: Host not found (authoritative)
。 當我有意將域名更改為不存在的TLD時,這就是Linux控制台中發生的情況:
$ ./test
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
what(): resolve: Host not found (authoritative)
Aborted (core dumped)
因為您不處理異常或檢查錯誤,所以程序異常終止。
注意:
#include <boost/asio.hpp>
#include <iostream>
using boost::asio::ip::tcp;
int main()
{
boost::asio::io_service io_service;
boost::system::error_code error = boost::asio::error::host_not_found;
// Get a list of endpoints corresponding to the server name.
tcp::resolver resolver(io_service);
tcp::resolver::query query("api.vk.com", "http");
tcp::resolver::iterator endpoint_iterator = resolver.resolve(query, error), last;
if (!error) {
// Try each endpoint until we successfully establish a connection.
tcp::socket socket(io_service);
for (;endpoint_iterator != last; ++endpoint_iterator) {
socket.connect(*endpoint_iterator, error);
if (!error) {
std::cout << "Successfully connected to " << endpoint_iterator->endpoint() << "\n";
break; // found working endpoint
} else {
std::cout << "Skipped " << endpoint_iterator->endpoint() << " - not connecting\n";
}
}
return 0;
} else {
std::cout << error.message() << "\n";
return 255;
}
}
在我的系統上打印
Successfully connected to 87.240.131.97:80
我只是簡單地更改了DNS服務器即可使用: Successfully connected to 87.240.131.119:80
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