How to Access a C Array of `const char*` in Go using cgo?

Accessing a C Array of const char* from Go via cgo

Involving arrays of const char* in Go code through cgo can be challenging. To address this issue, consider adopting a strategy that converts the C array into a Go slice. Here's an example that demonstrates this approach:

import (
    "fmt"
    "unsafe"

    "github.com/go-cgo/cgo"
)

func main() {
    // You can adjust the `arraySize` constant to reflect the actual number of strings in your C array.
    const arraySize = 3

    // Construct a Go slice from a pointer to the C array. The `&C.myStringArray` expression returns a pointer to the first element in the C array.
    cStrings := (*[1 << 30]*cgo.Char)(unsafe.Pointer(&C.myStringArray))[:arraySize:arraySize]

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

This approach relies on converting the C array into a Go slice using type casting. The unsafe.Pointer(&C.myStringArray) expression returns a pointer to the first element in the C array, which is then cast to a pointer to a Go slice.

By slicing the pointer to the C array, you create a Go slice that references the underlying elements of the C array. This slice can be iterated over and each element can be converted to a Go string using the cgo.GoString function.

Using this method, you can access and work with your C array of const char* in your Go code, enabling you to reuse the same logging index files across different platforms.

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