Livecode Builder - passing lcs string to C functions

[Dan Brown]

Thanks so much for this Trevor, I can now retrieve requests from and
respond to a virtual threaded http server which is nice. Now trying to work
out how not to block the engine when the function that calls the server
waits for a new request to come in i..e callback functions purely within
lcb

Dan



On Mon, Dec 28, 2020 at 10:09 PM Trevor DeVore via use-livecode <
use-livecode at lists.runrev.com> wrote:

> On Mon, Dec 28, 2020 at 7:02 AM Dan Brown via use-livecode <
> use-livecode at lists.runrev.com> wrote:
>
> > Hi I'm stuck trying to find examples of passing lcs strings to a C
> function
> > via pointer and it's driving me mad! I can retrieve char * pointers from
> C
> > functions, convert to string and pass back to lcs but haven't come across
> > any easy to grok examples of sending data to C. Any guidance would be
> > appreciated
>
>
> I've used MCStringConvertToBytes to convert strings to a value you can pass
> in as const char*. I have a hunspell example you can reference.
>
> Here is a link to the Hunspell_spell definition:
>
>
> https://github.com/hunspell/hunspell/blob/8a2fdfe5a6bb1cbafc04b0c8486abcefd17ad903/src/hunspell/hunspell.h#L69
>
> ```
> LIBHUNSPELL_DLL_EXPORTED int Hunspell_spell(Hunhandle* pHunspell, const
> char*);
> ```
>
> Here is a link to the LCB code that passes a UTF8 string to Hunspell_spell:
>
> https://github.com/trevordevore/lc-hunspell/blob/master/hunspell.lcb#L150
>
> Here is a link to the MCStringConvertToBytes definition in the LCB file:
>
> https://github.com/trevordevore/lc-hunspell/blob/master/hunspell.lcb#L19
>
> --
> Trevor DeVore
> ScreenSteps
> www.screensteps.com
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