[Pharo-users] UFFI callback, getting function pointer

[tomazz . turk]

Dear all,

I'm constructing a rudimentary webview library for Pharo with UFFI (available 
here 
[https://github.com/eftomi/Pharo-Webview](https://github.com/eftomi/Pharo-Webview
 "https://github.com/eftomi/Pharo-Webview";)). For now, the basic things work 
under Windows. I’m using “a tiny cross-platform webview library“ available at 
[https://github.com/webview/webview](https://github.com/webview/webview 
"https://github.com/webview/webview";).

One of the functions in the dll allows to register a C function to act as a 
callback and that can be used as a function in javascript, which is convenient 
for webview presenter - main program communication. This function has the 
signature:

```
extern void webview_bind(webview_t w, const char *name,
                              void (*fn)(const char *seq, const char *req,
                                         void *arg),
                              void *arg);
```

fn is the callback function. 

Is there any way to make a ffiCall description of this kind of signature, where 
fn would be an address of the callback in Pharo?

Thanks and best wishes,\
Tomaz