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

Question

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

Answer 1

Take a look at OutputDebugString

https://msdn.microsoft.com/en-us/library/windows/desktop/aa363362%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396

Answer 2

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

Answer 3

Try a simple call without wrappers to see if it works first.

Answer 4

Thank you.  Your tip has just made me realize that that dwLogLevel was set too high for the Trace method. 

---

Hong