How do I print floats/integers to the debug window

DanaFo

Dana Fortier

25 posts

#3533

How do I print floats/integers to the debug window

8 years, 11 months ago

I did some poking around and I can't seem to find a way to get ints and floats printing to debug window. I'm on Day 9 and wanted to see the stream of values of the sine wave over time. I tried printf but I have no idea where it is outputting, and I'm on the verge of diving into a massive rabbithole of debug error tracking - this should be a really simple solution that someone here must know.

Thanks again!

mmozeiko

Mārtiņš Možeiko

2562 posts / 2 projects

#3537

How do I print floats/integers to the debug window

8 years, 11 months ago Edited by Mārtiņš Možeiko on May 11, 2015, 7:08pm

You need to convert float/int values to string and then use OutputDebugString to print this string. To convert them to string there are multiple options to do that:
1) Write your own function to do that
2) Use some open source code, for example this: https://github.com/weiss/c99-snprintf/blob/master/snprintf.c
3) Depend on C runtime and use sprintf/snprintf function (from <stdio.h> header). Casey shows how to do this in Day 10 at 32:26 mark.

rathersleepy

Patrick Lahey

67 posts

#3540

How do I print floats/integers to the debug window

8 years, 11 months ago

Decidedly less "handmade" but, if you don't mind that, you could use cppformat.

Here is a simple test main:

#include "format.cc"
#include <Windows.h>

void DebugPrint(const char *format, fmt::ArgList args)
{
    OutputDebugStringA(fmt::format(format, args).c_str());
}
FMT_VARIADIC(void, DebugPrint, const char *)

int main(int argc, char *argv[])
{
    DebugPrint("x={} y={}\n", 34, 55);
    return 0;
}

DanaFo

Dana Fortier

25 posts

#3541

How do I print floats/integers to the debug window

8 years, 11 months ago

Awesome guys, I'll check these out, thank you!