cgo**char到切片字符串

Question

我已经使用cgo开发了一个pam模块。无法转换为[]字符串a**字符

func pam_sm_authenticate(pamh *C.pam_handle_t, flags C.int, argc C.int, argv **C.char) int { fmt.Println(C.GoString(*argv[0])) return 0 }

错误为

invalid operation: argv[0] (type **C.char does not support indexing)

如果你知道，请告诉我。

Answer 1

从cgo wiki拼凑在一起：https://github.com/golang/go/wiki/cgo#Turning_C_arrays_into_Go_slices.

import "C"
import "unsafe"
func GoStrings(argc C.int, argv **C.char) []string {
    length := int(argc)
    tmpslice := (*[1 << 30]*C.char)(unsafe.Pointer(argv))[:length:length]
    gostrings := make([]string, length)
    for i, s := range tmpslice {
        gostrings[i] = C.GoString(s)
    }
    return gostrings
}