Re: Using a temp file from emacs C code

[Cecilio Pardo <cpardo@imayhem.com>]

On 27/10/2024 7:17, Eli Zaretskii wrote:
>> How should I create and use a temp file from emacs' C code?
> 
> By first trying to avoid it, and do it from Lisp instead ;-)
> 
> But if you absolutely have no other way, then...

I promise.

>> I got this working but it doesn't look right:
>>
>> - Call lisp function make-temp-file, trough funcall
>> - Convert the returned string to utf-16 (because of Windows)
>> - Then to read the file use emacs_fopen
> 
> I don't understand: if you create the file, why do you need to read it
> back? why not simply pass whatever you write to the file to the code
> which needs to read it, as a string or a temp buffer?

Sorry, I oversimplified. I'm calling a winapi function that writes the file.

> Anyway, you could use Fmake_temp_file_internal instead.  You can see
> an example of that in the implementation of native-elisp-load.  And
> for reading a file (if you really need it; see above) use
> Finsert_file_contents, it will handle the issues with encoding the
> file name etc. for you.  (But beware of hidden rocks if you do this in
> code that needs to be run early during Emacs bootstrap.)

Thanks. Not this time.