Passing multidimensional arrays to C functions in CGO

This is a creation in Article, where the information may have evolved or changed.

Package main/* #include &LT;STDIO.H&G                                                                                                                                                                                                T                                                                                                                                                  #include <string.h>                                                                                                              void Fill_array (char *s) {                                                                              strcpy (S, "Cobbliu");                                                                                                                                                                                                      }                                                                                                                                                                      void Fill_2d_array (char **arr, int columesize) { strcpy ((char*) (arr+                                                                                                                                                          0*sizeof (char) *columesize), "Hello"); strcpy ((char*) (arr+1*sizeof (char) *columesize/sizeof (          char*)), "CGO");                                                                                                                          } */import "C" import "FMT" imp Ort "unsafe" func main () {var dir [10]byte C.fill_array ((*c.char) (unsafe. Pointer (&dir[0])) FMT.                                                                                                                                                                                            Println (String (dir[:]))//var dirs [4][16]byte Dir S: = make ([][]byte, 4) for I: = 0; I < 4; i++ {Dirs[i] = make ([]byte, +)} c.fill_2d_array ((**c.char) (unsafe. Pointer (&dirs[0][0])), C.int (+)) fmt. Println (dirs)}

It is important to note that slice can not be converted like this: (*c.char) (unsafe. Pointer (&dir)), because slice is actually not a fully-meaningful array in go, it's just a data structure with several heads, see http://blog.golang.org/ Go-slices-usage-and-internals, if the direct &dir, that is equivalent to the DIR this data structure address at the location of the conversion to *c.char, so that the consequences are completely non-period, run-time core off is the result of normal.

Https://groups.google.com/forum/#!topic/golang-nuts/Nb-nfVdAyF0 here is a discussion of multidimensional arrays, see the LAN classmate's reply, for C and go in the multi-dimensional array type of elaboration more clear.

enjoy!