[英]how to convert string to unsigned short using boost lexical cast?
I have a string containing the port, when I try to create a tcp endpoint I need its value in unsigned short 我有一个包含端口的字符串,当我尝试创建tcp端点时,我需要使用unsigned short的值
std::string to_port;
....
boost::lexical_cast<unsigned short>(to_port));
throws an exception bad lexical cast: source type value could not be interpreted as target
引发异常
bad lexical cast: source type value could not be interpreted as target
The following program works correctly: 以下程序可以正常运行:
#include <iostream>
#include <boost/lexical_cast.hpp>
int main(int argc, const char *argv[])
{
std::string to_port("8004");
unsigned short intport = boost::lexical_cast<unsigned short>(to_port);
std::cout << intport << std::endl;
std::cout << std::hex << intport << std::endl;
return 0;
}
But if we modify the first line of main
into: 但是,如果我们将
main
的第一行修改为:
std::string to_port;
We get the exception: 我们得到一个例外:
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::bad_lexical_cast> >'
what(): bad lexical cast: source type value could not be interpreted as target
Aborted (core dumped)
Which leads to the conclusion that there's something wrong with the parameter you are passing to the lexical_cast
. 得出的结论是,您传递给
lexical_cast
的参数有问题。
Can you print the to_port
variable to verify its content just before the lexical_cast
? 您可以在
lexical_cast
之前打印to_port
变量以验证其内容吗? Are you sure it is properly initialized and still in-scope when used (eg, no temporaries involved, no dangling pointers)? 您确定它已正确初始化并且在使用时仍在作用域内(例如,不涉及临时对象,不悬挂指针)?
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