如何获取全部异常的消息 [英] how to get message of catch-all exception

问题描述

如果我想在文件中写入有用的信息，每当我发现一个全部异常，怎么办？

If I want to write useful info to a file whenever i caught a catch-all exception, how to do it?

try
{
   //call dll from other company
}
catch(...)
{
   //how to write info to file here???????
}

推荐答案

信息出来的... catch块。这就是为什么代码通常处理这样的异常：

You can't get any information out of the ... catch block. That is why code usually handles exceptions like this:

try
{
    // do stuff that may throw or fail
}
catch(const std::runtime_error& re)
{
    // speciffic handling for runtime_error
    std::cerr << "Runtime error: " << re.what() << std::endl;
}
catch(const std::exception& ex)
{
    // speciffic handling for all exceptions extending std::exception, except
    // std::runtime_error which is handled explicitly
    std::cerr << "Error occurred: " << ex.what() << std::endl;
}
catch(...)
{
    // catch any other errors (that we have no information about)
    std::cerr << "Unknown failure occurred. Possible memory corruption" << std::endl;
}

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