Richmond,
Thanks for your reply.
Yes, I perfectly understand what happens, but my point is :
why is it so ? What is the logic behind ?
Is it specific to LC of is it closely related to the different OSes
on which LC runs ?
Why the fact of closing then reopening a file leads to overwriting
its content ?
Best,
jbv
> On 09/09/14 18:39, j...@souslelogo.com wrote:
>> Hi list
>>
>> I am trying to improve the speed of a large script including
>> many loops.
>> Could anyone explain why :
>>
>> - question 1 : if a text file contains "toto", after running the
>> following lines
>> open file tpath
>> read from file tpath until EOF
>> write (it & return & "titi") to file tpath
>> close file tpath
>>
>> the file contains :
>> totototo
>> titi
> Because you are doing this:
>
> reading the contents of file tpath
>
> and THEN writing that ('toto') and 'titi' back to the file.
>
> So 'toto' + 'toto' + return + 'titi' is what you end up with.
> ---------------------------------------------------------------
>>
>> and when running these lines
>> open file tpath
>> read from file tpath until EOF
>> close file tpath
>> open file tpath
>> write (it & return & "titi") to file tpath
>> close file tpath
>>
>> the file contains :
>> toto
>> titi
>
> Because here you close the file for reading and then open it again.
>
> In the first case your information is appended to the existing file.
>
> In the second case your information overwrites the existing file.
> -----------------------------------------------------------------
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