[Pharo-users] Re: UFFI callback, getting function pointer

Thanks for sharing the solution mate :) I don't know if you are aware, but you can also ask questions on Pharo's discord. Though it's easier to go through the history of conversations by email. Cheers, Harald Le mar. 7 déc. 2021 à 04:53, <tomazz.turk@gmail.com> a écrit :

Found the solution! Here it is, if somebody needs the description.

The webview_bind() function in DLL that expects to get a pointer to the function in Pharo can be called like this:

WebViewLibrary >> bind: webview name: aString callback: aFFICallback arguments: aByteString

^ self ffiCall: #(void webview_bind(void * webview, const char * aString, FFICallback aFFICallback, void * aByteString))

Before doing the actual call, the callback should be made according to fn signature:

doIt := FFICallback

signature: #( void (const char *seq, const char *req, void * arg) )

block: [ :seq :req :arg |

“do the stuff”

].

And the call is then made as:

WebViewLibrary new bind: webview name: 'newJsFunctionName' callback: doIt arguments: args.

The next challenge is, of course, threading ...

Best wishes, Tomaz