On Mon, Nov 6, 2017 at 10:59 AM, Chun Zhang <chunzh...@gmail.com> 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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