On Tue, Dec 19, 2017 at 9:40 AM, <roup...@gmail.com> wrote:
>
> 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)
> })
> }
>
No, I mean write a C function like
void callback(uintptr_t fn, char* err, int status) {
pfn = (void (*)(char*, int))fn;
pfn(err, status);
}
and write Go code like
C.callback(callback, e, c)
Ian
> 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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