RunWait Issue?

[nore 0]

$foo = RunWait(@ComSpec & " /c get.exe", "", @SW_HIDE, $STDERR_CHILD + $STDOUT_CHILD)
$output = GetOutput($foo)

Func GetOutput($out)
    $all = ""
    While 1
        $all &= StdoutRead($out)
        If @error Then Return $all
        
    Wend
EndFunc

$output is empty, why? running get.exe directly from cmd gives the required output, why isn't it given here? is there something wrong ?

[running 3.3.6.1]

[Mat 364]

Use Run not RunWait to get std