C ++异常和结构化异常之间的区别 [英] Difference between a C++ exception and Structured Exception

问题描述

有人可以解释MFC中的C ++异常和结构化异常之间的区别吗？

解决方案

您实际上有三种机制：

• 由编译器实现的C ++异常（ try / catch ）


• 由Windows提供的结构化异常处理（SEH）（ __ try / __除了）


• MFC异常宏（ TRY ， CATCH - 建立在SEH / C ++异常之上 - 另请参见TheUndeadFish的注释）

C ++异常通常保证自动清理在堆栈解卷（即本地对象的析构函数运行）期间，其他机制不会。

只有当它们被明确抛出时才会发生C ++异常。结构化异常可能发生在许多操作中，例如由于未定义的行为，将无效指针传递给API，卸载内存映射文件的后备存储等等。

MFC确实引入了异常宏来支持异常，即使编译器没有实现它们。

Can someone explain the difference between a C++ exception and a structured exception in MFC?

解决方案

You actually have three mechanisms:

• C++ exceptions, implemented by the compiler (try/catch)
• Structured Exception Handling (SEH), provided by Windows (__try / __except)
• MFC exception macros (TRY, CATCH - built on top of SEH / C++ exceptions - see also TheUndeadFish's comment)

C++ exceptions usually guarantee automatic cleanup during stack unwinding (i.e. destructors of local objects run), the other mechanisms don't.

C++ exceptions only occur when they are explicitly thrown. Structured Exceptions may occur for many operations, e.g. due to undefined behavior, passing invalid pointers to APIs, unmounting the backing store of a memory mapped file, and many more.

MFC did introduce the exception macros to support exceptions even if compilers didn't implement them.

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