CObList::GetNext()函数，Find()函数

CObList::GetNext()将pos的值设置为下一位置，它的返回值为当前节点的地址。CObList::Find()的返回值为pos类型，由GetAt(pos)可以看出pos是Find（）参数的前一个节点的地址

	int i = 10;for(POSITION pos = m_ptrlistTest.GetHeadPosition(); pos != NULL && i > 0; --i){CObList* cthead = (CObList*)m_ptrlistTest.GetAt(pos);cout << "before GetNext() : " << ((ClassTest*)cthead)->cstr1 << endl;CObList* ct = (CObList*)m_ptrlistTest.GetNext(pos);if (pos != NULL){cout << " after GetNext() " + ((ClassTest*)ct)->cstr1 << endl;cthead = (CObList*)m_ptrlistTest.GetAt(pos);cout << "after GetNext() GetAt() : " << ((ClassTest*)cthead)->cstr1 << endl << endl;}pos = m_ptrlistTest.Find(ct);cthead = (CObList*)m_ptrlistTest.GetAt(pos);cout << "after Find() : " << ((ClassTest*)cthead)->cstr1 << endl << endl;}