c# - 在 C# 中使用 C++ 函数

Question

我有一个用 c++ 定义的函数，我想将它包含在某些 c# gui 中。这就是我所做的:

在cpp文件中:

extern "C"             //No name mangling
__declspec(dllexport)  //Tells the compiler to export the function
int                    //Function return type     
__cdecl                //Specifies calling convention, cdelc is default, 
                   //so this can be omitted 
test(int number){
    return number + 1;
}

在cs文件中:

...
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = test(9);
        }
    }

    public static class NativeTest
    {
        private const string DllFilePath = @"c:\test.dll";
        [DllImport(DllFilePath , CallingConvention = CallingConvention.Cdecl)]
        static extern int test(int a);

    }
}

我得到这个错误:

Error 1 The name 'test' does not exist in the current context Line 28

感谢任何帮助

谢谢

Answer 1

您需要调用 NativeTest.test() 而不仅仅是 test()。