golang动态库(so)生成与使用方法教程

package main
 
/*
#include <stdlib.h>
*/
import "C"
import "fmt"
 
//export HelloWorld
func HelloWorld(str *C.char) *C.char{
	fmt.Printf(C.GoString(str))
	return str
}
 
func main() {
 
	// fmt.Printf("Done\n")
}

go mod init test
go mod tidy
go build -buildmode=c-shared -o libtest.so

readelf -a libtest.so| grep -i hello

#include "libtest.h"
void main(int argc, char* argv[]) {
    char * str =  HelloWorld("asdf");
    print(str);
}

#ifndef __INTERFACE_H__
#define __INTERFACE_H__
 
char* HelloWorld(char *);
 
#endif

cmake_minimum_required(VERSION 2.8)
project(demo)
# C++11 编译
set(CMAKE_BUILD_TYPE "Debug")
set(CMAKE_CXX_STANDARD 11)
# set(CMAKE_SHARED_LINKER_FLAGS " -L./ -Wl,-rpath=./")
SET(CMAKE_INCLUDE_CURRENT_DIR ON)
SET(CMAKE_CXX_STANDARD_REQUIRED ON)
 
set( demo_SOURCE
   ${CMAKE_CURRENT_SOURCE_DIR}/main.c
)
 
link_directories(${PROJECT_SOURCE_DIR})
 
SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR})
 
add_executable(demo ${demo_SOURCE})
 
target_link_libraries(demo -ltest ) 
 

mkdir build
cd build
cmake ..
make

./demo

func add() (**C.char, *C.char) {
        //a := []string{"1111111111111111111", "222", "333"}
        a, err := Parsefilelist()
        if err != nil {
                fmt.Println(err)
                return nil, C.CString(err.Error())
        }
        count := len(a)
        c_count := C.int(count)
        //使用完请释放该内存空间，防止内存泄露
        cArray := C.malloc(C.size_t(c_count) * C.size_t(unsafe.Sizeof(uintptr(0))))
        b := (*[1024]*C.char)(cArray)
        for index, value := range a {
                b[index] = C.CString(value)
        }
        return (**C.char)(&b[0]), nil
}