Calling OutputDebugString in a C++ UWP project

Question

I'm trying to add a simple diagnostic output to a C++ UWP shared project akin to System.Diagnostics.Debug.WriteLine in C#. Following the documentation for OutputDebugString here and this solution here I've tried this:

char buf[1024]; sprintf(buf, "frequency = %f", (float)result); OutputDebugString(buf);

but I get the compiler error

argument of type "char*" is incompatible with parameter of type "LPCWSTR"

How do I fix this?

That worked - thanks Hans (N.B. I also needed to swap sprintf to sprintf_s). — dumbledad
– dumbledad, Commented Nov 14, 2016 at 14:30

dumbledad · Accepted Answer · 2016-11-14 14:27:30Z

A colleague advised me to add

#include "strsafe.h"

after any pre-compiled headers and then use this code instead

TCHAR buf[1024]; size_t cbDest = 1024 * sizeof(TCHAR); StringCbPrintf(buf, cbDest, TEXT("frequency = %f"), (float)result); OutputDebugString(buf);

I also needed to remember to swap the debugger to handle mixed code:

msdn.microsoft.com/en-us/library/windows/desktop/… describes when TCHAR is char or wchar_t, etc

Jonathan ANTOINE · Accepted Answer · 2016-11-15 13:15:48Z

Here is what I use most of the time (notice the "L"):

#include <Windows.h> OutputDebugString(L"Sarah Connor ?\n");

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