c ++ try-except语句 [英] c++ try-except statement

问题描述

我遇到了有关检测VMWare或虚拟PC的文章

http://www.codeproject.com/KB/system/VmDetect.aspx

，我看到他们使用某种try-except语句。

So我在MSDN中查找： http：/ /msdn.microsoft.com/en-us/library/s58ftw19%28v=vs.80%29.aspx

I came across this article about detecting VMWare or Virtual PC
http://www.codeproject.com/KB/system/VmDetect.aspx
and I saw that they use some kind of try-except statement.
So I looked it up in the MSDN: http://msdn.microsoft.com/en-us/library/s58ftw19%28v=vs.80%29.aspx

我不明白为什么我会使用try-except而不是好的旧try-catch。
它只是给我有关异常的额外信息吗？

如果是这样，我可以使用try-catch，当我使用附带的文章中的代码，对吗？

感谢：）

and I don't understand why would I use a try-except instead of the good old try-catch. does it just give me additional information about the exception?
If so, I can use a try-catch when I use the code from the attached article, right?
thanks :)

推荐答案

__ try / __except 是尝试 / catch 种异常。您可以捕获硬件异常，如浮点违规，坏指针解引用等，而不是C ++异常。这被称为结构化异常处理或SEH，如果你知道在哪里查找，MSDN有很多。

__try/__except is a try/catch, for a different kind of exception. You can catch hardware exceptions like floating point violation, bad pointer de-reference, etc, and not C++ exceptions. This is referred to as Structured Exception Handling, or SEH, and MSDN has quite a bit on it if you know where to look.

在这种情况下，他们使用它检测无效指令。这是他们尝试执行x86不支持的指令，虚拟机使用它们。如果你在一个真正的CPU上运行，那么你会得到一个无效的指令异常，如果你在一个虚拟机上运行，​​你刚刚谈到它。

In this case, they're using it to detect invalid instructions. This is where they attempt to execute instructions that x86 doesn't support, and virtual machines use them. If you're running on a real CPU, then you will get an invalid instruction exception, and if you're running on a virtual machine, you just talked to it.

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