c# - WPF Exe 在 C++ DLL 中调用函数和设置变量

Question

我有一个 WPF 应用程序，它需要调用用 C++ 编写的 DLL 中的函数。

插图

WPFAppClass.cs (C#)

public class SampleClass
{
        [DllImport("SimDll.dll")]
        public static extern bool SetLoggingOn(string path);

        public void Function(string path) //invoked from a click command
        {
            SetLoggingOn(path);
        }
}

SimDll.dll (C++)

DLLFnc.h

#define DECLARE_DLL __declspec(dllexport)
extern "C" {
    BOOL    DECLARE_DLL     __stdcall   SetLoggingOn(CString    path);
}

FncDll.cpp（我知道头文件和源文件的名称不同）

BOOL __stdcall SetLoggingOn(CString path)
{
    if (!path.IsEmpty())
    {
        //The issue lies here.
        //I need to be able to set a boolean & a path value to be used in             
        //another class.
        //Upon declaring GLOBAL variables & using it I get 
        //multiply defined symbols error.
        //I tried making the variables I want STATIC, code builds, but when
        //C# code invokes this method, I get MemoryAccessViolation saying
        //the memory being read is protected or corrupt.
        //FYI: If I do nothing & just return true or false IT WORKS
        return true;
    }
    return false;
}

有没有办法可以从 C# exe 以某种方式在 C++ dll 中设置布尔和字符串？

PS：我是 C++ 的新手，但有相当多的 C# 知识。