STL, "upgrade" from sprintf to ostream in a logclass

[justin223]

Hello I've written a logfile class that writes the logentries in xml format. A typical usage: mylog.WriteLog(LOG_PRIO_HIGH, "Agroup", "This is a text with %d some %s vars", 34, "diffrent"); output This is a text with 39 some diffrent vars I want to accomplish the same thing by using streams/stringbuf. But I've not found any good examples that show me how I should do. What i've found is a couple of examples that derives a class from stringbuf and from ostream. I would be nice of I can get something like this: log << log_prio(1) << log_group("test") << "hello" << nIntVar << strBuf << log_end; log << "this is a string"; log << " something more" << log_end; log << log_prio(2) << "last line" << log_end; would look like: hello1yeye this is a string something more last line How do I accomplish this? Thanks, Jonas

[Anonymous]

try overloading the "<<" or ">>" operators.

[justin223]

Yep. I've started to do so.

class CDtLog 
{

private: 
	std::ostringstream	m_os;
	bool		bNewEntry;
	int		m_nPrio;
	char*		m_szGroup[40];

public:
	CDtLog()
	{
		bNewEntry = true;
		m_nPrio = 2;
		m_szGroup[0] = NULL;
	}

	template
		CDtLog &operator<<(const T &item)
		{
			if (bNewEntry)
			{
				m_os << "";
				bNewEntry = false; 
			}
			m_os << item ;
			return *this;
		};

		void print()
		{
			printf(m_os.str().c_str());
		}
};


int _tmain(int argc, _TCHAR* argv[])
{
	CDtLog test;
	int i = 10;
	test << "hejsan" << std::setfill(' ') << std::setw(10) << 12 << i;
	test.print();


	return 0;
}

I need a modifier that tells me that a debugentry is done, similiar to endl, but instead of just flushing, it ends the xml tag and then flush it to the file. I also need to check every entered character to see if it's a < or >, if so I need to translate it to > or <, or it will ****up the xml. I also want modifiers that I can use to change the prio and group.