golang調用c動態庫
簡介
golang調用c語言動態庫,動態方式調用,可指定動態庫路徑,無需系統目錄下
核心技術點
- 封裝c動態庫
- go語言調用c代碼
實例代碼
- 封裝c動態庫
- 頭文件
test_so.h
int test_so_func(int a,int b);
- 源文件
test_so.c
#include "test_so.h" int test_so_func(int a,int b) { return a*b; }
- 頭文件
- go語言調用
/*
#include "loadso.h"
#cgo LDFLAGS: -ldl
*/
import "C"
import "fmt"
func main() {
fmt.Println("20*30=", C.do_test_so_func(20, 30))
}
- loadso.h
int do_test_so_func(int a,int b);
- loadso.c
#include "loadso.h"
#include <dlfcn.h>
char dllname[]= "/root/test_so.so";
int do_test_so_func(int a,int b)
{
void* handle;
typedef int (*FPTR)(int,int);
handle = dlopen(dllname, 1);
if(handle == 0){
return -1;
}
FPTR fptr = (FPTR)dlsym(handle, "test_so_func");
int result = (*fptr)(a,b);
return result;
}
關聯知識
- 查看so動態庫的導出函數
nm -D *.do
# nm -D libhi.so
0000000000201028 B __bss_start
w __cxa_finalize
000000000000063d T Echo
0000000000201028 D _edata
0000000000201030 B _end
0000000000000658 T _fini
w __gmon_start__
000000000000062a T hi
0000000000000500 T _init
w _ITM_deregisterTMCloneTable
w _ITM_registerTMCloneTable
U puts