文章目录
- go调用so库
- 生成so库
- 调用so库
- 回调函数如何处理
go调用so库
生成so库
load_so.h
#ifndef _LOAD_SO_H
#define _LOAD_SO_H
int do_test_so_func(int a,int b);
#endifload_so.c
#include "load_so.h"
int do_test_so_func(int a,int b)
{
return a + b;
}生成so文件
gcc -fPIC -shared -o libload_so.so load_so.c调用so库
创建go项目hello
mkdir cgoTest创建main.go
touch main.go内容如下
package main
/*
#cgo CFLAGS: -I ./include
#cgo LDFLAGS: -L /home/dengzr/cgoTest/lib -lload_so
#include "include/load_so.h"
*/
import "C"
import (
"fmt"
)
func main() {
val := C.do_test_so_func(1,1)
fmt.Printf("num1: %v\n", val)
}将so库及头文件导入cgoTest目录结构如下
├── include
│ ├── load_so.c
│ └── load_so.h
├── lib
│ └── libload_so.so
└── main.go初始化go项目环境
[root@zs3-2 cgoTest]# go mod init cgoTest编译go程序
[root@zs3-2 cgoTest]# go build cgoTest导入so库环境变量
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/dengzr/cgoTest/lib/运行测试用例
[root@zs3-2 cgoTest]# ./cgoTest
num1: 2回调函数如何处理
.h
#ifndef _LOAD_SO_H
#define _LOAD_SO_H
typedef void (*Callback)(int);
void callCFunction(Callback fun);
int do_test_so_func(int a,int b);
#endif.c
#include "load_so.h"
int do_test_so_func(int a,int b)
{
return a + b;
}
void callCFunction(Callback fun)
{
fun(10);
}.go
package main
/*
#cgo CFLAGS: -I ./include
#cgo LDFLAGS: -L /home/dengzr/fmp4/cgoTest/lib -lload_so -lbsr-fmp4-mux
#include "include/load_so.h"
#include "include/fmp4MuxAPI.h"
// 导出Go函数为C函数
extern void goCallback(int);
*/
import "C"
import (
"fmt"
"os"
"io"
"bytes"
"encoding/binary"
)
// Go回调函数
//export goCallback
func goCallback(value C.int) {
fmt.Println("Go callback called with value:", int(value))
}
func main() {
val := C.do_test_so_func(1,1)
fmt.Printf("num1: %v\n", val)
// 在Go代码中调用C回调函数
fun := (C.Callback)(C.goCallback)
C.callCFunction(fun)
}注意，go回调函数前必须导入 export goCallback，否则报错
/home/dengzr/go/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/tmp/go-link-267202374/go.o:(.data+0x8): undefined reference to `goCallback'
collect2: error: ld returned 1 exit status必须声明extern void goCallback(int);否则未定义C.goCallback