Python calls the so library generated by Golang

This is a creation in Article, where the information may have evolved or changed.

Version: Go version go1.8.3 linux/amd64

The go language generated C language so library on the internet has a lot of information, because the project needs Python and go to combine, and Python can call the C language so library, so try a bit

Create a new test folder in the Gopath directory under SRC, and create a new test.go

Test.go Code

package mainimport "C"//export Hellofunc Hello() string {    return "Hello"}//export Testfunc Test(){    println("test");}func main() {}

Using commands to generate libhello.so and libhello.h

go build -x -v -ldflags "-s -w" -buildmode=c-shared  -o libhello.so test

Since the Hello function returns a gostring, the gostring declaration under Libhello.h is

typedef struct { const char *p; GoInt n; } GoString;

Visible is a struct, so when using Python calls you need to use the cTYPES library to convert

from ctypes import *    class StructPointer(Structure):      _fields_ = [("p", c_char_p), ("n", c_longlong)]    if __name__ == "__main__":      lib = cdll.LoadLibrary("./libhello.so")      lib.Hello.restype = StructPointer    str = lib.Hello()      print(str.n)    #str.n是GoString返回字符的长度，没有截取的话后面会跟着一大串字符串    print(str.p[:str.n])    lib.Test()

Output results

5Hellotest