How can i redirect the unittests error output to a file?

On Wednesday, 14 January 2015 at 18:50:04 UTC, ref2401 wrote:
> How can i redirect the unittests error output to a file?

You redirect stderr to a file using whatever tools your shell provides you. In anything related to unix sh you would do something like this:

./run_unittests 2>errorFile

where 2 stands for stderr (1 is for stdout). This would create a new file (or overwrite an existing file) called errorFile with whatever run_unittests prints to stderr, which would include unittest errors.

Unfortunately i'm new to using shells.

I use standard windows cmd. Here is my script:

dmd main.d -debug -unittest -wi

if %errorLevel% equ 0 (
	start main.exe
) else (
	echo --- Building failed! ---
	pause
)

I wrote "start main.exe 2> errorFile" but it doesn't work. errorFile is empty.

On 1/15/2015 4:32 AM, ref2401 wrote:
> Unfortunately i'm new to using shells.
>
> I use standard windows cmd. Here is my script:
>
> dmd main.d -debug -unittest -wi
>
> if %errorLevel% equ 0 (
>      start main.exe
> ) else (
>      echo --- Building failed! ---
>      pause
> )
>
> I wrote "start main.exe 2> errorFile" but it doesn't work. errorFile is
> empty.
>

Open up a command prompt and execute dmd with a nonexistent file name.

dmd foo.d 2> err.txt

You will find that dmd prints an error to err.txt, specifically that it can't find foo.d. (You can find more info about stdio handles and the command line at [1]).

Now execute it like this:

start dmd foo.d 2> err.txt

And you will find an empty err.txt. This is because you are redirecting the output of stderr from the *start* program, and not from dmd (you can read more about the start command at [2]). I'm not aware of anyway to redirect the output of a command or program executed by start.

[1] http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true
[2] https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/start.mspx?mfr=true

Thank you.