How to pass a two-dimensional integer array to C from Go by cgo

[jianzhangbjz]

Hey guys,

I'm in trouble that how to pass a a two-dimensional integer array to C. My code as the following, the String slice works well, but the int two-dimensional array failed!
C code:

bool test_settopologyresource(bsagomodule* _self, char* _nodename,
        int _resourceindex, char** _nameunits, int** _levelmatrix) {
    printf("\n set topology resource-> node:%s, resource index:%d", _nodename, _resourceindex);
    bool result = settopologyresource(_self->client, _nodename, _resourceindex, _nameunits, _levelmatrix);
    return result;
}

Go code:

gonameunits := []string{"gpu0", "gpu1", "gpu2", "gpu3"}
   nameunits := make([]*C.char, len(gonameunits))
   for i, _ := range gonameunits {
       nameunits[i] = C.CString(gonameunits[i])
       defer C.free(unsafe.Pointer(nameunits[i]))
   }
   fmt.Println("nameunits:", nameunits)

    golevelmatrix := [][]int{{1}, {3, 3}, {3, 3, 2}}
   levelmatrix := make([][]C.int, len(golevelmatrix))
   for i, _ := range golevelmatrix {
       levelmatrix[i] = make([]C.int, len(golevelmatrix[i]))
       for j, _ := range golevelmatrix[i] {
           levelmatrix[i][j] = C.int(golevelmatrix[i][j])
       }
   }
   fmt.Println("levelmatrix:", levelmatrix)

    C.test_settopologyresource(mod, C.CString("node1"), C.int(2), (**C.char)(unsafe.Pointer(&nameunits[0])), (**C.int)(unsafe.Pointer(&levelmatrix[0][0])))

I also test only pass a one-dimensional integer array, it works well! So, how to pass a two-dimensional integer array to C from Go by cgo? Or something else I missed?

[bradfitz]

For questions about Go, see https://golang.org/wiki/Questions.

[jianzhangbjz]

Thanks, question is here: https://stackoverflow.com/questions/45539904/how-to-pass-a-two-dimensional-integer-array-to-c-from-go-by-cgo

[jianzhangbjz]

I think this maybe a bug of cgo. I pass a slice of String and one-dimensional integer array, both of working well.
But when trying pass two-dimensional integer array, failed.