Thanks for your response, are you referring to something like this:
/*
#include <stdio.h>
#include <stdlib.h>
void parse(char* err, int status) {
// do work
}
*/
func Ccomputation(address *C.char) {
ptr := uintptr(unsafe.Pointer(C.parse))
SomeGoComputation(C.GoString(address), func(errString string, code int){
//passing the go callback values to the c callback wrapper
e := C.CString(errString)
c := C.int(code)
// then free both e and c via unsafe pointer
ptr(e, c)
})
}
On Monday, December 18, 2017 at 10:03:47 PM UTC-5, rou...@gmail.com wrote:
>
> Hey guys,
>
> I want to write a c wrapper around a go code that has a callback
>
> func SomeGoComputation(address string, callback func(string,int)) {
> _, err = // do some computation with address, maybe go over the
> network
> if (err != nil) {
> callback(err.Error(), 0)
> }
> // I mean you get the gist
> callback("",1)
> }
>
> I've having trouble writing the callback signature which in c would be
> void(*c_callback)(*char, int)
>
> //export Ccomputation
> func Ccomputation(address *C.char, // how to write that callback) {
> SomeGoComputation(C.GoString(address), func(errString string, code int
> ){
> //passing the go callback values to the c callback wrapper
> e := C.CString(errString)
> c := C.int(code)
> c_callback(e, c)
> // then free both e and c via unsafe pointer
> })
> }
>
>
> I look around and some (articles or not related answer from go posts) say
> to use an interface, so I did try `(C.char*, C.int)interface {}` but I
> did get an error missing , at line where the callback was declared in the
> wrapper.
>
> Any ideas, all advice are welcome thanks .. :)
>
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