C++：捕获runtime_error
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c++: Catch runtime_error
提问by Plouff
I am learning c++ at home and I am using the rapidxml lib. I am using the utils provided with it to open files:
我在家里学习 C++，我正在使用 Rapidxml 库。我正在使用随它提供的实用程序打开文件：
rapidxml::file<char> myfile (&filechars[0]);
I noticed that if filecharsis wrong the rapidxml::filethrow a runtime_error:
我注意到如果filechars是错误的rapidxml::file抛出一个 runtime_error:
// Open stream
basic_ifstream<Ch> stream(filename, ios::binary);
if (!stream)
throw runtime_error(string("cannot open file ") + filename);
stream.unsetf(ios::skipws);
I think I need to write something like that:
我想我需要写这样的东西：
try
{
rapidxml::file<char> GpxFile (pcharfilename);
}
catch ???
{
???
}
I made some googling, but I did not find what I need in the place of the ???.
我做了一些谷歌搜索，但我没有在???.
Could somebody help me? Thanks!
有人可以帮助我吗？谢谢！
回答by Marlon
You need to add an exception declaration next to the catchstatement. The type thrown is std::runtime_error.
您需要在catch语句旁边添加异常声明。抛出的类型是std::runtime_error。
try
{
rapidxml::file<char> GpxFile (pcharfilename);
}
catch (const runtime_error& error)
{
// your error handling code here
}
If you need to catch multiple, different kinds of exceptions, then you can tack on more than one catchstatement:
如果您需要捕获多种不同类型的异常，那么您可以添加多个catch语句：
try
{
rapidxml::file<char> GpxFile (pcharfilename);
}
catch (const runtime_error& error)
{
// your error handling code here
}
catch (const std::out_of_range& another_error)
{
// different error handling code
}
catch (...)
{
// if an exception is thrown that is neither a runtime_error nor
// an out_of_range, then this block will execute
}
回答by Chad
try
{
throw std::runtime_error("Hi");
}
catch(std::runtime_error& e)
{
cout << e.what() << "\n";
}
回答by Mark Reed
Well, it depends on what you want to do when it happens. This is the minimum:
嗯，这取决于你想在它发生时做什么。这是最低要求：
try
{
rapidxml::file<char> GpxFile (pcharfilename);
}
catch (...)
{
cout << "Got an exception!"
}
If you want to get at the actual exception, then you need to declare a variable to store it in inside the parentheses in place of the three dots.
如果你想得到实际的异常，那么你需要声明一个变量来将它存储在括号内而不是三个点。
