Outlook add-in integrating Skype

#include "Sdk.h"
#include "StringMgr.h"
#include "DbgTrace.h"

#define MAX_TRACE_STRING_LENGTH (1024)

static
VOID
NDAPI
FDbgTrace_SetLevel(
    DbgTrace    *This, 
    int         Level
) {
    This->Level = Level;
    return;
}

static
VOID
NDAPI
FDbgTrace_Track(
    DbgTrace    *This, 
    int         Level,
    LPCWSTR     Msg
) {
    if(Level > This->Level) {
        return;
    }

    OutputDebugStringW(Msg);
    if(IsDebuggerPresent()) {
        OutputDebugStringW(L"\r\n");
    }
}

static
VOID
NDAPIV
FDbgTrace_TrackV(
    DbgTrace    *This, 
    int         Level, 
    LPCWSTR     Msg, 
    ...
) {
    WCHAR MsgV[MAX_TRACE_STRING_LENGTH] = L"";
    va_list ap;

    if(Level > This->Level) {
        return;
    }

    va_start(ap, Msg);
    SzStringFormatV(MsgV, 
                    Msg, 
                    ap
                   );
    va_end(ap);

    This->Track(This, 
                Level, 
                MsgV
               );
}

static
DbgTrace
__DbgTrace = {
    &FDbgTrace_SetLevel, 
    &FDbgTrace_Track, 
    &FDbgTrace_TrackV, 
#ifdef _DEBUG
    TRACE_LEVEL_DEBUG
#else
    TRACE_LEVEL_NONE
#endif
};

DbgTrace*
DbgTrace_GetObject(
    VOID
) {
    return &__DbgTrace;
}