golang 生成 shared object 供其他語言使用

摘要： golang 生成 shared object 供其他語言使用 LINUX so 檔案基本概念和命名規則 libxmns.so.1.2.3 1 major 2 minor 3 release major 增加，原有函式介面已經不能使用，minor和releas...

golang 生成 shared object 供其他語言使用

LINUX so 檔案基本概念和命名規則

libxmns.so.1.2.3 1 major 2 minor 3 release

• major 增加，原有函式介面已經不能使用，minor和release 復歸於0
• minor 增加， 新增加了一些函式介面，但原有函式介面還能使用， release 復歸於0
• release 增加，修改一些bug, 函式介面不變

c-go

模板-供c、java等編譯型語言或指令碼語言使用

package main

import "C"
import "fmt"

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

//export GetName
func GetName(firstName string) string{
return fmt.Sprint(firstName,"-so")
}

func main(){

}

注意，即使是要編譯成動態庫，也要有main函式，上面的import "C"一定要有 而且一定要有註釋

編譯

go build -buildmode=c-shared -o libhello.so .\libhello.go

使用lua指令碼語言呼叫

使用到的庫： lua2go

luajit 環境變數配置

export LUA_PATH="~/?.lua;;"
export LUAJIT_LIB=/usr/local/openresty/luajit/lib
export LUAJIT_INC=/usr/local/openresty/luajit/include/luajit-2.1
export LUAJIT_HOME=/usr/local/openresty/luajit

PATH=$PATH:$LUAJIT_HOME/bin
export PATH

呼叫demo

local lua2go = require('lua2go')
 local example = lua2go.Load('./libvibrant.so')
 
 lua2go.Externs[[
extern GoInt32 Sum(GoInt32 a,GoInt32 b);
 ]]
 
 print(example.Sum(1,100))

呼叫測試

luajit test_go.lua

plug 模式

1、golang 1.8+ 支援

模板

package main

import (
"fmt"
)
func DCall(){
fmt.Println("plugin.so was called") 
}

func DCallWithParam(msg string){
fmt.Println("引數內容為:",msg) 
}


func main() {
fmt.Println("goroute全部退出")
}

編譯

go build --buildmode=plugin plugin.go

使用

package main

import (
"plugin"
)
func main() {

//載入動態庫
p, err := plugin.Open("plugin.so")
if err != nil {
panic(err)
}
//查詢函式
f, err := p.Lookup("DCall")
if err != nil {
panic(err)
}
//轉換型別後呼叫函式
f.(func())()

f2, err := p.Lookup("DCallWithParam")
if err != nil {
panic(err)
}

//帶參函式的呼叫
f2.(func(string))("hello world,plugin.so")
}

go buildmode 說明

The 'go build' and 'go install' commands take a -buildmode argument which
indicates which kind of object file is to be built. Currently supported values
are:

-buildmode=archive
Build the listed non-main packages into .a files. Packages named
main are ignored.

-buildmode=c-archive
Build the listed main package, plus all packages it imports,
into a C archive file. The only callable symbols will be those
functions exported using a cgo //export comment. Requires
exactly one main package to be listed.

-buildmode=c-shared
Build the listed main package, plus all packages it imports,
into a C shared library. The only callable symbols will
be those functions exported using a cgo //export comment.
Requires exactly one main package to be listed.

-buildmode=default
Listed main packages are built into executables and listed
non-main packages are built into .a files (the default
behavior).

-buildmode=shared
Combine all the listed non-main packages into a single shared
library that will be used when building with the -linkshared
option. Packages named main are ignored.

-buildmode=exe
Build the listed main packages and everything they import into
executables. Packages not named main are ignored.

-buildmode=pie
Build the listed main packages and everything they import into
position independent executables (PIE). Packages not named
main are ignored.

-buildmode=plugin
Build the listed main packages, plus all packages that they
import, into a Go plugin. Packages not named main are ignored.