Mastering Go - Second Edition

The Go package

This subsection will present you with the code of the Go package that will be used in a C program. The name of the Go package needs to be main but its filename can be anything you want; in this case, the filename will be usedByC.go and it will be presented in three parts.

You will learn more about Go packages in Chapter 6, What You Might Not Know About Go Packages and Go Functions.

The first part of the code of the Go package is next:

package main 
 
import "C" 
 
import ( 
    "fmt" 
) 

As I said before, it is mandatory to name the Go package main. You will also need to import the C package in your Go code.

The second part comes with the following Go code:

//export PrintMessage func PrintMessage() { fmt.Println("A Go function!") }  ...