[Vala] swpan error won win32

[raum no-log org]

Hi,

I'm trying to launch a command with spawn_async_with_pipes unsuccessfully...

I've installed gspawn_console and helper executables in the same directory
of test.vala

--- test.vala -----------------------------------------------

int main (string[] args) {

                string[] spawn_args;
// spawn_args = { "a_soft.exe" };
                spawn_args = {"dir"};
                string[] spawn_env = Environ.get ();
                Pid child_pid;

                int standard_input;
                int standard_output;
                int standard_error;

                try {

                        Process.spawn_async_with_pipes (null,
                                spawn_args,
                                spawn_env,
                                SpawnFlags.SEARCH_PATH ,
                                null,
                                out child_pid,
                                out standard_input,
                                out standard_output,
                                out standard_error);
                 } catch (SpawnError e) {
                         stderr.printf ("Error : %s\n", e.message);
                }

                return 0;
}
------------------------------------------------------

I've set on a cmd shell : set G_SPAWN_WIN32_DEBUG=1

I've launched valac with a lot ofd debug information about
vala_gspawn_console:
> valac test.vala -o test.exe
calling C:\Vala\bin\vala-gspawn-console.exe with argv:
argv[0]: C:\Vala\bin\vala-gspawn-console.exe
argv[1]: 6
argv[2]: 7
argv[3]: z
argv[4]: 4
argv[5]: -
argv[6]: -
argv[7]: y
argv[8]: y
argv[9]: w
argv[10]: pkg-config
argv[11]: --silence-errors
argv[12]: --modversion
argv[13]: glib-2.0
(...)

and then launched test.exe and get :
> test.exe
calling C:\Temp\gspawn-win64-helper-console.exe with argv:
argv[0]: "C:\Temp\gspawn-win64-helper-console.exe"
argv[1]: 10
argv[2]: 11
argv[3]: 3
argv[4]: 6
argv[5]: 8
argv[6]: -
argv[7]: y
argv[8]: y
argv[9]: -
argv[10]: dir
argv[11]: NULL
Could not load UI: Failed to execute helper program (Invalid argument)

Do you have an idea ? where am I wrong ?

thanks

Regards

Raum