How to Access a C `const char*` Array from Go?

Accessing a C Array of Type const char * from Go

Problem

A C program defines an array of type const char *, named myStringArray, containing a list of strings. The goal is to access this array from a Go program using cgo and convert each array entry into a Go string.

Discussion

However, the provided Go code fails to access the array correctly, instead it iterates over the characters of the first string in the array.

Solution

A better approach is to first convert the C array into a Go slice, which provides a more convenient and safer way to access its elements. Here's how this can be done:

import "C"
import "fmt"

// Convert the C array into a Go slice of pointers to C (null-terminated) strings.
arraySize := 3
cStrings := (*[1 << 30]*C.char)(unsafe.Pointer(&C.myStringArray))[:arraySize:arraySize]

// Iterate over the slice and convert each C string into a Go string.
for _, cString := range cStrings {
    fmt.Println(C.GoString(cString))
}

Output:

NAME_OF_FIRST_THING
NAME_OF_SECOND_THING
NAME_OF_THIRD_THING

This solution ensures that each array element is accessed correctly as a distinct Go string.

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