可以让Python从C＃接收长度可变的字符串数组吗
问题说明
这可能是一个红色的鲱鱼，但是我的非阵列版本看起来像这样：
This may be a red herring, but my non-array version looks like this:
C＃
using RGiesecke.DllExport;
using System.Runtime.InteropServices;
namespace Blah
{
public static class Program
{
[DllExport("printstring", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.AnsiBStr)]
public static string PrintString()
{
return "Hello world";
}
}
}
Python
import ctypes
dll = ctypes.cdll.LoadLibrary("test.dll")
dll.printstring.restype = ctypes.c_char_p
dll.printstring()
我在寻找 printstrings ，它将获取可变大小的 List< string> 。如果不可能，我将解决对于固定长度的 string [] 。
I am looking for a printstrings, which would fetch a List<string> of variable size. If that's not possible, I will settle for a fixed-length string[].
正确答案
.NET是能够将对象类型转换为COM Automation的 Variant ，反之，当通过p / invoke层时。
.NET is capable of transforming the object type into COM Automation's VARIANT and the reverse, when going through the p/invoke layer.
VARIANT在 automation.py 中声明rel = noreferrer> comtypes 。
VARIANT is declared in python's automation.py that comes with comtypes.
Wh使用VARIANT的好处是它可以容纳很多东西，包括许多东西的数组。
What's cool with the VARIANT is it's a wrapper that can hold many things, including arrays of many things.
请记住，您可以像这样声明.NET C＃代码
With that in mind, you can declare you .NET C# code like this:
[DllExport("printstrings", CallingConvention = CallingConvention.Cdecl)]
public static void PrintStrings(ref object obj)
{
obj = new string[] { "hello", "world" };
}
并在python中像这样使用它：
And use it like this in python:
import ctypes
from ctypes import *
from comtypes.automation import VARIANT
dll = ctypes.cdll.LoadLibrary("test")
dll.printstrings.argtypes = [POINTER(VARIANT)]
v = VARIANT()
dll.printstrings(v)
for x in v.value:
print(x)
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