Python调用golang编译的.so库报“dlsym(0x7fe2a7d4ea30, background): symbol not found”错误的原因是什么？

golang 代码：

package main
import (
“C”
“github.com/360EntSecGroup-Skylar/excelize”
)
func background(excelname, sheetname, image *C.char) *C.char {
excelname_go := C.GoString(excelname)
sheetname_go := C.GoString(sheetname)
image_go := C.GoString(image)
xlsx, err := excelize.OpenFile(excelname_go)
if err != nil {
	panic(err)
}

xlsx.SetSheetBackground(sheetname_go, image_go)

err = xlsx.SaveAs(excelname_go)
if err != nil {
	panic(err)
}

return C.CString("success")
}
func main()  {}

编译为.so 库的命令：go build -o excel.so -buildmode=c-shared excel.go
Python3 调用.so 库的代码:

import ctypes
from ctypes import cdll
def set_background():
name = b’/Users/myyou/work/background.xlsx’
background = cdll.LoadLibrary(’/Users/myyou/work/excel.so’).background
background.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p]
background.restype = ctypes.c_char_p
background(name, b’Sheet1’, b’/Users/myyou/work/ntim.jpg’)
return ‘ok’

调用后发生的错误：

Traceback (most recent call last):
  File "/Users/myyou/work/pythonenv/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 2910, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-3-24964e319282>", line 1, in <module>
    set_background()
  File "/Users/myyou/work/test.py", line 275, in 
    background = cdll.LoadLibrary('/Users/kamui/work/excel.so').background
  File "/Users/myyou/.pyenv/versions/3.6.2/lib/python3.6/ctypes/__init__.py", line 361, in __getattr__
    func = self.__getitem__(name)
  File "/Users/myyou/.pyenv/versions/3.6.2/lib/python3.6/ctypes/__init__.py", line 366, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(0x7fe2a7d4ea30, background): symbol not found

而且在编译成.so 库是并没有生成 excel.h 只有 excel.so

Python调用golang编译的.so库报“dlsym(0x7fe2a7d4ea30, background): symbol not found”错误的原因是什么？

更多关于Python调用golang编译的.so库报“dlsym(0x7fe2a7d4ea30, background): symbol not found”错误的原因是什么？的实战教程也可以访问 https://www.itying.com/category-94-b0.html

caililin 1楼

这个错误通常是因为Go的C导出函数命名规则导致的。Go编译器会对C导出函数名进行名称修饰（name mangling），而你在Python中调用时使用了错误的函数名。

根本原因： Go编译器在编译共享库时，会为C导出函数添加前缀（通常是包名）并修改大小写。比如你定义的background函数，实际在.so文件中可能被命名为main.background或_cgoexp_开头的名称。

解决方案：

查看实际符号名：

nm -D yourlib.so | grep background

正确的Go代码示例（需显式导出）：

// main.go
package main

import "C"

//export Background
func Background() {
    // 你的函数实现
}

func main() {}

编译命令：

go build -buildmode=c-shared -o yourlib.so main.go

Python调用代码：

from ctypes import CDLL

lib = CDLL('./yourlib.so')
# 使用实际导出的函数名，通常是"Background"（注意大小写）
lib.Background()

关键点：

必须使用//export 函数名注释
函数名首字母必须大写
编译时必须指定-buildmode=c-shared

一句话总结：检查Go导出的实际符号名并在Python中使用正确名称。

更多关于Python调用golang编译的.so库报“dlsym(0x7fe2a7d4ea30, background): symbol not found”错误的原因是什么？的实战系列教程也可以访问 https://www.itying.com/category-94-b0.html

yibo5220 2楼

自己找到原因了，需要价格注释

 import ctypes from ctypes import cdll //export background def set_background(): name = b'/Users/myyou/work/background.xlsx' background = cdll.LoadLibrary('/Users/myyou/work/<a target="_blank" href="http://excel.so" rel="nofollow noopener">excel.so</a>').background background.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p] background.restype = ctypes.c_char_p background(name, b'Sheet1', b'/Users/myyou/work/ntim.jpg') return 'ok'

yibo5220 3楼

注释加错了,应该加载 golang 代码中

 package main import ( "C" "<a target="_blank" href="http://github.com/360EntSecGroup-Skylar/excelize" rel="nofollow noopener">github.com/360EntSecGroup-Skylar/excelize</a>" ) //export background func background(excelname, sheetname, image *C.char) *C.char { excelname_go := C.GoString(excelname) sheetname_go := C.GoString(sheetname) image_go := C.GoString(image) xlsx, err := excelize.OpenFile(excelname_go) if err != nil { panic(err) } xlsx.SetSheetBackground(sheetname_go, image_go) err = xlsx.SaveAs(excelname_go) if err != nil { panic(err) } return C.CString("success") } func main() {}