Thanks Ian!
Can you please give some suggestion on how to properly handle this issue?
The C++ API cannot be modified.
Sincerely,
Chun
On Monday, November 6, 2017 at 3:25:13 PM UTC-5, Ian Lance Taylor wrote:
>
> On Mon, Nov 6, 2017 at 10:59 AM, Chun Zhang <chun...@gmail.com
> <javascript:>> wrote:
> >
> > Sorry about the confusion! My gocode set the value of the device and
> then
> > pass it to C++ code.
> >
> > Code goes like this:
> >
> > device := "eth1" // hardcoding this value works or retrieving it from
> Flag
> > as below
> >
> > flag.StringVar(&device, "Device", "eth1", "NIC to Listen")
>
> It would help if you showed a complete standalone example, but I think
> I see what you mean. This works because the current compiler produces
> a string literal for "eth1" that is stored in the program itself. The
> internal string pointer points into the program text segment, and so
> it is not a Go pointer, and so you do not get the error.
>
> A Go *string is still not a C char**, but I guess that a *string does
> look like C struct { char *p; uintptr_t n; }*, so since you are
> passing only a single string it may be working by accident. Note that
> the Go string is not necessarily NUL-terminated, but perhaps in this
> case it happens to be.
>
> Ian
>
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