Windows SEH Exception 0xc0000005 0xc0000094 0xc0000374

1、空指针问题

	try
	{
		char* p = new char[256];
		strcpy(p, "hello");
		int size = strlen(p);
		printf("strlen = %d\n", size);
		delete[] p;
		p = nullptr;
		strcpy(p, "world");
		size = strlen(p);
		printf("strlen = %d\n", size);
	}
	catch (const std::exception& e)
	{
		printf("err:%s\n", e.what());
	}
	//catch (...)
	//{
	//	DWORD errcode = GetLastError();
	//	printf("Unknown err, code = %d\n", errcode);
	//}

上面代码中如果去掉p=nullptr那么p就变为了野指针，程序可能不会出错，但是会产生巨大的隐藏风险：p指针已经被delete，所指向的内存已被操作系统回收，strcpy拷贝的数据随时可能被后续的其他数据所覆盖；

2、除0操作产生0xc0000094异常代码：被除数不能为零

	try
	{
		int x = 10;
		int y = 0;
		int z = x / y;
	}
	catch (const std::exception& e)
	{
		printf("err:%s\n", e.what());
	}
	//catch (...)
	//{
	//	DWORD errcode = GetLastError();
		printf("Unknown err, code = %d\n", errcode);
	//}

3、删除已经被删除的对象产生未经处理的异常: 0xC0000374: 堆已损坏

	try
	{
		A* p = new A();
		p->print();
		p->a = 12;
		p->print();
		delete p;
		p->a = 25;
		p->print();
		delete p;
	}
	catch (const std::exception& e)
	{
		printf("err:%s\n", e.what());
	}
	//catch (...)
	//{
	//	DWORD errcode = GetLastError();
		printf("Unknown err, code = %d\n", errcode);
	//}

转载于:https://my.oschina.net/u/3489228/blog/3069023