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, Nov 14 '16 at 14:30

dumbledad · Accepted Answer · 2016-11-14T14:27:30.930

3

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:

edited Nov 14 '16 at 14:27

answered Nov 14 '16 at 14:09

dumbledad

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https://msdn.microsoft.com/en-us/library/windows/desktop/ff381407(v=vs.85).aspx describes when TCHAR is char or wchar_t, etc – Anthony Wieser Nov 14 '16 at 17:01

score 0 · Answer 2 · answered Nov 15 '16 at 13:15

0

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

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

answered Nov 15 '16 at 13:15

Jonathan ANTOINE

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Calling OutputDebugString in a C++ UWP project

2 Answers2