wxlua-users

[wxlua-users] Could not read redirected output for some commands

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

I download wxLua-2.8.12.3-Lua-5.2.2-MSW-Unicode.zip and wrote the following code for testing wxExecute function. But the results of "streamin:Read" function are always empty.

I have tried the exec example contained in wxWidgets' source code. And I could see the redirected output with this command "cmd /k tree d: & exit".

If I replace the command "cmd /k tree d: & exit" with "attrib", I could get the desired result. What's the problem with the following code?

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


package.cpath = package.cpath..";./?.dll;./?.so;../lib/?.so;../lib/vc_dll/?.dll;"
require("wx")

frame = wx.wxFrame( wx.NULL, wx.wxID_ANY,"wxLua Demo", wx.wxDefaultPosition,
                    wx.wxSize(600,480), wx.wxDEFAULT_FRAME_STYLE )

console = wxstc.wxStyledTextCtrl(frame, wx.wxID_ANY)
console:Show(true)function Output(message)
    console:AppendText(message)
    console:GotoPos(console:GetLength())endlocal proc, streamin

function ReadIt(event)if streamin and streamin:CanRead()then
        Output("Can Read\n")local str = streamin:Read(4096)
        print(str)
        Output(str .."\n")else
        Output("No Output\n")endendlocal myTimer = wx.wxTimer(frame)
frame:Connect(wx.wxEVT_TIMER, ReadIt)function Execute() 
    proc = wx.wxProcess()
    proc:Redirect()
    proc:Connect(wx.wxEVT_END_PROCESS,function(event)
          myTimer:Stop();
          Output("Process Ended\n")
          ReadIt()
          proc =nilend)local cmd ="cmd /k tree d: & exit"
    Output("Running program: ".. cmd .."\n")local pid = wx.wxExecute(cmd, wx.wxEXEC_ASYNC, proc)
    Output("Pid is ".. pid .."\n")
    streamin = proc and proc:GetInputStream()
    myTimer:Start(500);end 

frame:Show(true)
Execute()
wx.wxGetApp():MainLoop()

Re: [wxlua-users] Could not read redirected output for some commands

[Paul K <pau...@ya...>]

> I download wxLua-2.8.12.3-Lua-5.2.2-MSW-Unicode.zip and wrote the following code for testing wxExecute function. But the results of "streamin:Read" function are always empty.
>    local cmd = "cmd /k tree d: & exit"
>    Output("Running program: " .. cmd .. "\n")

I used a slightly different command ("cmd /k dir & exit"), but it
worked just fine when I ran it from ZeroBrane Studio. Maybe try with a
different wx.dll library?

Paul.

[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()

Re: [wxlua-users] Could not read redirected output for some commands

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

The command "cmd /k dir & exit" did not work when I ran it from ZBS.
At 2015-10-14 22:59:47,"Paul K" <pau...@ya...> wrote:
>> I download wxLua-2.8.12.3-Lua-5.2.2-MSW-Unicode.zip and wrote the following code for testing wxExecute function. But the results of "streamin:Read" function are always empty.
>>    local cmd = "cmd /k tree d: & exit"
>>    Output("Running program: " .. cmd .. "\n")
>
>I used a slightly different command ("cmd /k dir & exit"), but it
>worked just fine when I ran it from ZeroBrane Studio. Maybe try with a
>different wx.dll library?
>
>Paul.
>
>------------------------------------------------------------------------------
>_______________________________________________
>wxlua-users mailing list
>wxl...@li...
>https://lists.sourceforge.net/lists/listinfo/wxlua-users

Re: [wxlua-users] Could not read redirected output for some commands

[Paul K <pau...@ya...>]

> The command "cmd /k dir & exit" did not work when I ran it from ZBS.

What do you mean by "did not work"? This is what I get for that command:

Running program: cmd /k dir & exit
Pid is 18556
Can Read
 Volume in drive D is FILES
 Volume Serial Number is 6AF1-AFBB
...

If I pass the wrong command, I get "Can Read" and then "No Output",
which is what you'd expect.

Paul.

Re: [wxlua-users] Could not read redirected output for some commands

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

What I get for that command is:

Running program: cmd /k dir & exit
Pid is 6640
Process Ended
Can Read

And no further result. It's very strange.

At 2015-10-15 10:13:53,"Paul K" <pau...@ya...> wrote:
>> The command "cmd /k dir & exit" did not work when I ran it from ZBS.
>
>What do you mean by "did not work"? This is what I get for that command:
>
>Running program: cmd /k dir & exit
>Pid is 18556
>Can Read
> Volume in drive D is FILES
> Volume Serial Number is 6AF1-AFBB
>...
>
>If I pass the wrong command, I get "Can Read" and then "No Output",
>which is what you'd expect.
>
>Paul.
>

Re: [wxlua-users] Could not read redirected output for some commands

[Paul K <pau...@ya...>]

> Running program: cmd /k dir & exit
> Pid is 6640
> Process Ended
> Can Read
> And no further result. It's very strange.

It is strange. It's as if the program is done, but nothing is
"waiting" in the output to be read. Did you say you were running on
Win10? Maybe it's a new "feature"?

I'd try on some other Windows machine you may have access to...

Paul.

Re: [wxlua-users] Could not read redirected output for some commands

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

I was running on Windows 7, 32bit.
At 2015-10-16 13:11:30,"Paul K" <pau...@ya...> wrote:
>> Running program: cmd /k dir & exit
>> Pid is 6640
>> Process Ended
>> Can Read
>> And no further result. It's very strange.
>
>It is strange. It's as if the program is done, but nothing is
>"waiting" in the output to be read. Did you say you were running on
>Win10? Maybe it's a new "feature"?
>
>I'd try on some other Windows machine you may have access to...
>
>Paul.