Re: Checking for a writeable or readable file
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- Subject: Re: Checking for a writeable or readable file
- From: Rena <hyperhacker@...>
- Date: 2012年10月23日 06:08:09 -0400
On Tue, Oct 23, 2012 at 5:43 AM, Konstantinos Asimakis
<inshame@gmail.com> wrote:
> Sorry for the double post. I forgot to remove the triple ___ in some places,
> remove those before trying the code.
>
>
> On Tue, Oct 23, 2012 at 12:41 PM, Konstantinos Asimakis <inshame@gmail.com>
> wrote:
>>
>> --This goes somewhere very early in your code, before opening any file.
>> do
>> local files={}
>> local oldopen=io.open
>> function io.open(f,m)
>> local r=oldopen(f,m)
>> ___files[r]=m
>> return r
>> end
>> function io.getmode(handle)
>> return ___files[handle]
>> end
>> end
>>
>>
>> t=io.open("/dev/random","r")
>> --This will print "r".
>> print(io.getmode(t))
>> --And probably this would also work but I haven't tested it: t:getmode()
>
>
You would also want to return the error message from oldopen if any,
and set files as a weak table.
--
Sent from my Game Boy.