One way to work this around is to use https://github.com/mattn/go-pointer.
On Wed, Jan 29, 2020 at 2:12 PM <aotto1968z...@gmail.com> wrote:
> Hi,
>
> I try to use a *C* library with *GO* and have a small problem passing a
> *GO* pointer through *C* into a *GO* callback.
> If I set: "*export GODEBUG=cgocheck=0*" everything works fine but without
> I get the error from above
>
> Detail: I want to pass "*argv*" through *C* back to *GO*, the lifetime of
> the *argv* is only the lifetime of the *Send* function call
>
> // PROBLEM: [ErrorCatch] runtime error: cgo argument has Go pointer to Go
> pointer
> // SOLVE: export
> GODEBUG=cgocheck=0
>
> func (this *MqC) Send (callSig string, argv ...interface{})
> {
> hdl :=
> this.getCTX()
>
> callSig_ptr :=
> (C.MQ_CST)(C.CString(callSig))
>
> defer
> C.free((unsafe.Pointer)(callSig_ptr))
>
>
>
> var errVal C.enum_MqErrorE = C.gomsgque_Send(hdl, callSig_ptr,
> C.MQ_INT(len(argv)), unsafe.Pointer(&argv))
>
>
> if (errVal > C.MQ_CONTINUE) { MqErrorC_Check(C.MQ_MNG(hdl), errVal)
> }
> }
>
>
> The callback is:
>
> //export atomSet
> func atomSet( hdl C.MQ_MNG, objv unsafe.Pointer, skip C.MQ_INT, typ
> C.enum_MqSendE,
> inP unsafe.Pointer) C.enum_MqErrorE {
> ifc := (*(*[]interface{})(objv))[skip]
> ...
> }
>
> so, what is the GO solution for pass-through problem.
>
> thanks… mfg ao
>
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