Re: [go-nuts] ask for you help about cgo and interface
On Wed, Dec 4, 2019 at 5:21 PM FAN DEAR wrote: > > First of all, thank you very much for your reply. > Actually, what I want to do is to use golang to complete the TCP > communication SDK. > When C++ calls golang to send a message, > I need to tell the C++ message sending status at the appropriate time, such > as sending failed, sending successfully, and the reply received. > Here are some code snippets: When calling between C++ and Go, you need to call functions by name. You can't use an interface. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcWkSmxGRHrhp-m9F1%3DuZ00z8DbHDHNz%3DkPgjzrGY2ERPA%40mail.gmail.com.
Re: [go-nuts] ask for you help about cgo and interface
First of all, thank you very much for your reply.
Actually, what I want to do is to use golang to complete the TCP
communication SDK.
When C++ calls golang to send a message,
I need to tell the C++ message sending status at the appropriate time, such
as sending failed, sending successfully, and the reply received.
Here are some code snippets:
package test3
import "C"
func main() {
}
//export IRequestListener
type IRequestListener interface {
OnSendSuccess()
OnSendFailure(err error)
OnResponse(msg string)
}
//export GetCard
func GetCard(uid string, listener IRequestListener) {
disposeRequest(&request{
message: uid,
}, func(req *request) {
listener.OnSendSuccess()
}, func(req *request, err error) {
listener.OnSendFailure(err)
}, func(resp *response) {
listener.OnResponse(resp.string())
})
}
Can you give me a sample code? thank you very much!
在 2019年12月3日星期二 UTC+8下午11:28:47，Ian Lance Taylor写道：
>
> On Tue, Dec 3, 2019 at 12:29 AM FAN DEAR >
> wrote:
> >
> > typedef struct { void *t; void *v; } GoInterface;
> >
> >
> > What is *t and *v?
>
> See https://research.swtch.com/interfaces.
>
> Ian
>
>
> > 在 2019年12月3日星期二 UTC+8上午2:41:36，Ian Lance Taylor写道：
> >>
> >> On Mon, Dec 2, 2019 at 9:57 AM FAN DEAR wrote:
> >> >
> >> >
> >> > How to use add2 function, i am very troubled.
> >>
> >> On this mailing list please post code as ordinary text, or as a link
> >> to the Go playground. Don't post colorized images with a black
> >> background. Thanks.
> >>
> >> You can't declare a Go interface type in C. C doesn't have interface
> >> types. The only way to use an exported Go function that takes an
> >> argument of interface type is for a Go function to call a C function
> >> with an interface value and for that C function to then call a Go
> >> function.
> >>
> >> What are you really trying to do?
> >>
> >> Ian
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "golang-nuts" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to golan...@googlegroups.com .
> > To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/10a1fea2-fe29-45c3-8261-f92b5baae3df%40googlegroups.com.
>
>
>
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Re: [go-nuts] ask for you help about cgo and interface
On Tue, Dec 3, 2019 at 12:29 AM FAN DEAR wrote:
>
> typedef struct { void *t; void *v; } GoInterface;
>
>
> What is *t and *v?
See https://research.swtch.com/interfaces.
Ian
> 在 2019年12月3日星期二 UTC+8上午2:41:36，Ian Lance Taylor写道：
>>
>> On Mon, Dec 2, 2019 at 9:57 AM FAN DEAR wrote:
>> >
>> >
>> > How to use add2 function, i am very troubled.
>>
>> On this mailing list please post code as ordinary text, or as a link
>> to the Go playground. Don't post colorized images with a black
>> background. Thanks.
>>
>> You can't declare a Go interface type in C. C doesn't have interface
>> types. The only way to use an exported Go function that takes an
>> argument of interface type is for a Go function to call a C function
>> with an interface value and for that C function to then call a Go
>> function.
>>
>> What are you really trying to do?
>>
>> Ian
>
> --
> You received this message because you are subscribed to the Google Groups
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to golang-nuts+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/10a1fea2-fe29-45c3-8261-f92b5baae3df%40googlegroups.com.
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Re: [go-nuts] ask for you help about cgo and interface
typedef struct { void *t; void *v; } GoInterface;
What is *t and *v?
在 2019年12月3日星期二 UTC+8上午2:41:36，Ian Lance Taylor写道：
>
> On Mon, Dec 2, 2019 at 9:57 AM FAN DEAR >
> wrote:
> >
> >
> > How to use add2 function, i am very troubled.
>
> On this mailing list please post code as ordinary text, or as a link
> to the Go playground. Don't post colorized images with a black
> background. Thanks.
>
> You can't declare a Go interface type in C. C doesn't have interface
> types. The only way to use an exported Go function that takes an
> argument of interface type is for a Go function to call a C function
> with an interface value and for that C function to then call a Go
> function.
>
> What are you really trying to do?
>
> Ian
>
--
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Re: [go-nuts] ask for you help about cgo and interface
On Mon, Dec 2, 2019 at 9:57 AM FAN DEAR wrote: > > > How to use add2 function, i am very troubled. On this mailing list please post code as ordinary text, or as a link to the Go playground. Don't post colorized images with a black background. Thanks. You can't declare a Go interface type in C. C doesn't have interface types. The only way to use an exported Go function that takes an argument of interface type is for a Go function to call a C function with an interface value and for that C function to then call a Go function. What are you really trying to do? Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcX_1m6Y7cOH%2Bm_ehtLg9AaL-jibEuWq_jdmZF_OvmuPSQ%40mail.gmail.com.
