error C2065: '_T' : undeclared identifier

Question

Hi,

I'm developing a small application(.exe) for Windows Mobile devices using the Windows Mobile Standard 6 SDK. I work on a XP sp2 laptop and I try to write C++. As far as I can see, I am doing exactly what I found in example code blocks. I have not a clue why I get "error C2065: '_T' : undeclared identifier" when I try to build my code.


The following is the beginning of my .cpp file.

#include "stdafx.h"
#include "log.h"
#include <stdio.h>
#include <tchar.h>
#include <string>
#include <iostream>
#include <fstream>
using namespace std;

FILE* MyLog::m_fp;

MyLog::MyLog()
{
	m_fp = _tfopen(_T"\\Program Files\\MyEngineLog.txt", _T"a+");
	if (NULL == m_fp)
	{
		cerr << _T"problem opening file" << endl;
	}
}

Any ideas will be much appreciated.

Answer 1

try:    _T("a+")

Answer 2

Hi Piet,

_T() is a macro and should be used like this,

// Provide () for _T.
m_fp = _tfopen(_T("\\Program Files\\MyEngineLog.txt"), _T("a+"));

Regards,
Jijo.

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Answer 3

Thank you guys,

That was quite a silly mistake.