How do I convert a Go array of strings to a C array of strings?

Question

I am using cgo in a project, and I want to export a function for use. Here\'s an example of what I want to achieve:

package csplit

import (
    \"C         


        

Answer 1

You're returning a Go slice which is allocated in Go, and is a different structure than a C array. You need to allocate an array in C:

//export Split
func Split(original *C.char, split *C.char) **C.char {
    goResult := strings.Split(C.GoString(original), C.GoString(split))
    cArray := C.malloc(C.size_t(len(goResult)) * C.size_t(unsafe.Sizeof(uintptr(0))))

    // convert the C array to a Go Array so we can index it
    a := (*[1<<30 - 1]*C.char)(cArray)

    for idx, substring := range goResult {
        a[idx] = C.CString(substring)
    }

    return (**C.char)(cArray)
}