Not pretty but if you are sure the array is zero-terminated, you can simply
cast it to the correct type:
C.GoString((C.char*)(&p.hostname))
(untested)
On Thu, Apr 30, 2020 at 1:06 PM Dean Schulze <dean.w.schu...@gmail.com>
wrote:
> That gives this error (which I've gotten with just about everything I try):
>
> cannot use &p.mach_name (type *[25]_Ctype_char) as type *_Ctype_char in
> argument to _Cfunc_GoString
>
> It seems to be the fixed length of the char[] that gives cgo a problem.
>
>
> On Thursday, April 30, 2020 at 1:46:34 PM UTC-6, Jan Mercl wrote:
>>
>> On Thu, Apr 30, 2020 at 8:17 PM Dean Schulze <dean.w...@gmail.com>
>> wrote:
>> >
>> > I must be missing something pretty simple, but I have a C struct like
>> this:
>> >
>> > typedef struct line
>> > {
>> > char hostname[HOSTNAME_MAX];
>> > char ip[IP_MAX];
>> > ...
>> > }
>> >
>> > When I try to do the simple thing
>> >
>> > C.GoString(p.hostname)
>>
>> An array of a fixed size within a C struct is a value (the same as in
>> Go), but C.GoString expects a pointer to a C.char. Try
>> `C.GoString(&p.hostname)`.
>>
>> Not tested. Note that if hostname is not properly zero terminated,
>> your code will crash or misbehave.
>>
>> (Automatic array decay applies to C code, but not in Go.)
>>
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