[wxlua-users] wxExecuted process is not deleted when main window exits

[Z.H. <zo...@ye...>]

Hi all, I am using wxLua 2.8.12 for Windows. In the following code,
I try to asynchronously execute some command and redirect its output.

The problem is, if I close main window before child process terminates,
the child process is not deleted. I could still see "tree.com" process
inside Windows Task Manager after this wxLua app exits.

What is the problem with my code below?

--------------------------------------------------------------------

require("wx")

frame = wx.wxFrame(wx.NULL, wx.wxID_ANY, "Test")

function ExecCommand(cmd)
    proc = wx.wxProcess(frame)
    proc:Redirect()
    pid = wx.wxExecute(cmd, wx.wxEXEC_ASYNC, proc)
    if pid > 0 then
        print("process id is " .. tostring(pid))
        streamIn = proc and proc:GetInputStream()
    end
end

function ReadStream()
    if streamIn and streamIn:CanRead() then
        local str = streamIn:Read(4096)
    end
end

frame:Connect(wx.wxEVT_IDLE, ReadStream)

frame:Connect(wx.wxEVT_END_PROCESS, function(event)
    proc = nil
end)

frame:Connect(wx.wxEVT_CLOSE_WINDOW, function(event)
    if proc then proc:Detach() end
    event:Skip()
end)

frame:Show(true)

cmd = "tree.com C:\\Windows"

ExecCommand(cmd)

wx.wxGetApp():MainLoop()