Windows SEH Exception 0xc0000005 0xc0000094 0xc0000374

一、空指針問題

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);
	//}

上面代碼中若是去掉p=nullptr那麼p就變爲了野指針，程序可能不會出錯，可是會產生巨大的隱藏風險：p指針已經被delete，所指向的內存已被操做系統回收，strcpy拷貝的數據隨時可能被後續的其餘數據所覆蓋；

二、除0操做產生0xc0000094異常代碼：被除數不能爲零

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);
	//}

三、刪除已經被刪除的對象產生未經處理的異常: 0xC0000374: 堆已損壞

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);
	//}