Golang dynamic library exploration: how to effectively use it in projects?

Golang dynamic library exploration: How to use it effectively in projects?

In the Go language, a dynamic link library (DLL) is a library file that can be linked to a program at runtime and called at runtime. By using dynamic libraries, we can package some commonly used functions for reuse in different projects, thereby improving code reusability and maintainability.

In this article, we will explore how to effectively utilize dynamic libraries in Go projects and illustrate their usage through specific code examples.

Create a dynamic library

First, we need to create a dynamic library. In Go language, you can build a dynamic library through the -buildmode=c-shared parameter.

// math.go

package main

import "C"

//export Add
func Add(a, b int) int {
    return a + b
}

//export Subtract
func Subtract(a, b int) int {
    return a - b
}

func main() {}

Execute the following command in the terminal to compile math.go into a dynamic library:

go build -buildmode=c-shared -o libmath.so math.go

Import the dynamic library

Next, we Import the dynamic library created above into another Go project and use the functions in it.

// main.go

package main

/*
#cgo CFLAGS: -I.
#cgo LDFLAGS: -L. -lmath
#include <stdio.h>
#include <stdlib.h>
#include "math.h"
*/
import "C"
import "fmt"

func main() {
    sum := C.Add(10, 5)
    fmt.Println("10 + 5 =", sum)

    difference := C.Subtract(10, 5)
    fmt.Println("10 - 5 =", difference)
}

Compile and run

Execute the following command in the terminal to compile main.go and link the dynamic library:

go build -o main main.go

Then run the generated Executable file:

./main

Summary

Through the above steps, we successfully created a dynamic library and called it in another project. Using dynamic libraries can modularize commonly used functions, improve code reusability, and also facilitate project maintenance and updates.

I hope this article will help everyone understand and use dynamic libraries in Golang. If you have more questions or want to learn more, feel free to continue exploring and learning.

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