我嘗試從 python 運行一個簡單的 go 腳本，但出現了分段錯誤。這是我的代碼：主程序package mainimport ( /*typedef struct foo{int a;int b;int c;int d;int e;int f;} foo;*/ "C")func main() {}//export Foofunc Foo(t []int) C.foo { return C.foo{}}main.py# loading shared objectlib = cdll.LoadLibrary("main.so")# go typeclass GoSlice(Structure): _fields_ = [("data", POINTER(c_void_p)), ("len", c_longlong), ("cap", c_longlong)]lib.Foo.argtypes = [GoSlice]lib.Foo.restype = c_void_pt = GoSlice((c_void_p * 5)(1, 2, 3, 4, 5), 5, 5)f = lib.Foo(t)print(f)有了這個代碼，我得到了140362617287784[1] 23067 segmentation fault python3 main.py現在如果我刪除e并f從main.go我得到None并且不再出現分段錯誤。為什么結構中的成員數量在這里很重要？[編輯] 兩者都在同一位置運行，我運行一個命令clear && go build -o main.so -buildmode=c-shared main.go && python3 main.py
1 回答
慕神8447489
TA貢獻1780條經驗 獲得超1個贊
您的 GO/C 代碼是正確的。問題出在 python 腳本中。該lib.Foo.restype = c_void_p調用需要一個 void 指針，但庫返回一個 C 結構。您需要在 python 中定義返回類型 ctypes 結構，然后它將按您的預期工作。
main.go ：_
package main
import (
/*
typedef struct foo{
int a;
int b;
int c;
int d;
int e;
int f;
} foo;
*/
"C"
)
func main() {
}
//export Foo
func Foo(t []int) C.foo {
foo := C.foo{}
foo.a = 1 // setting some values to avoid seeing zeros
foo.b = 2
return foo
}
主要.py：
from ctypes import *
# loading shared object
lib = cdll.LoadLibrary("main.so")
# go type
class GoSlice(Structure):
_fields_ = [("data", POINTER(c_void_p)), ("len", c_longlong), ("cap", c_longlong)]
class Foo(Structure):
_fields_ = [('a', c_int),
('b', c_int),
('c', c_int),
('d', c_int),
('e', c_int),
('f', c_int)]
lib.Foo.argtypes = [GoSlice]
lib.Foo.restype = Foo
t = GoSlice((c_void_p * 5)(1, 2, 3, 4, 5), 5, 5)
f = lib.Foo(t)
print(f)
print(f.a)
print(f.b)
然后運行go build -o main.so -buildmode=c-shared main.go && python main.py，會打?。?/p>
go build -o main.so -buildmode=c-shared main.go && python3 main.py
<__main__.Foo object at 0x102608830>
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