How to make TRACE work in native C++ code for a C# Univeral apps project

I am playing the
real-time communication sample project. It works as expected but writing to the Output console does not work for the C++ code. I have tried the TRACE macro, and also tried the Trace() function of the project. Nothing is shown in
the Output console. I am using the Debug configuration and running the app in the debug mode.
Could anyone shed some light on this?
Hong

Thanks for the response. Here is the Trace method of the project which uses OutputDebugString:
void Trace(DWORD dwLevel, LPCWSTR pszFormat, ...)
if (g_dwLogLevel > dwLevel)
return;
WCHAR szTextBuf[256];
va_list args;
va_start(args, pszFormat);
StringCchVPrintf(szTextBuf, _countof(szTextBuf), pszFormat, args);
OutputDebugString(szTextBuf);
It does not work. It does not generate any error either.
Hong

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