Re: [wxlua-users] Can't read output with wxPROCESS_REDIRECT and wxEXEC_ASYNC

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

Hi João,

Thank you for the solution. I ended up using the following, as it
allows me to implemented synchronous processing (while still using
EXEC_ASYNC):

        local proc = wx.wxProcess.Open(cmd) -- this is using EXEC_ASYNC
        proc:Redirect()
        local streamin = proc:GetInputStream()
        local str = streamin:Read(4096)

:Read() blocks waiting for input, which is exactly what I need.

Paul.

On Mon, Oct 1, 2012 at 4:03 AM, João Mendes <lor...@gm...> wrote:
> Hi Paul,
>
> Did you try this:
>
>     proc = wx.wxProcess()
>
>     proc:Connect(wx.wxEVT_END_PROCESS,
>       function(event)
>           print("Hello - the process is over and won't be deleted.")
>           -- event:Skip(true) <-- will crash since wxWidgets will delete it
> too
>           -- proc = nil
>           -- collectgarbage( "collect" ) -- not necessary, but it tests the
> problem
>       end
>     )
>
>     proc:Redirect()
>     wx.wxExecute( cmd, wx.wxEXEC_ASYNC, proc )
>
> I get this code somewhere and work fine for me.
>
> --
> João Mendes de Oliveira Neto
>
>
> 2012/9/30 Paul K <pau...@ya...>
>>
>> Hi All,
>>
>> I'm trying to read output from a program and am having trouble with
>> the following three lines of code:
>>
>>       local proc = wx.wxProcess(wx.NULL, wx.wxPROCESS_REDIRECT)
>>       local pid = wx.wxExecute(cmd, wx.wxEXEC_ASYNC, proc)
>>       local streamin = proc:GetInputStream()
>>
>> The app crashes on any attempt to get input stream. The following code
>> with EXEC_SYNC works fine though:
>>
>>       local pid = wx.wxExecute(cmd, wx.wxEXEC_SYNC)
>>
>> But this doesn't give me any way to access the output of the command I
>> execute.
>>
>> I suspect the problem is in the first parameter in wxProcess:
>> wx.wxProcess(wx.NULL, but I don't see any other way to not provide
>> wxEvtHandler or create a dummy one (replacing wx.NULL with
>> wx.wxEvtHandler() has the same effect: the app crashes).
>>
>> This is all on windows 7 running fairly recent 2.8.12.2 code. I'd
>> appreciate any ideas on how to get program output. Thanks.
>>
>> Paul.
>>
>>
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>
>
>
> ------------------------------------------------------------------------------
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> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
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>