我正在尝试使用用 C++ 编写的 DLL，但我的应用程序是用 C# 编写的

DLL 来自另一家公司，但他们为他们的软件提供了 SDK。

他们给出了如何在 C++ 中加载他们的 DLL 的示例，但我需要将其调整为 C#。

下面是他们在 C++ 中如何做到这一点的说明

MarkEzd.dll 文件是动态链接库。

MarkEzdDll.h 是 MarkEzd.dll 中导出函数的头文件

MarkEzd.dll 的调用方式是显式链接。开发者需要通过调用Windows API 函数来加载和释放MarkEzd.dll。

步骤如下。

HINSTANCE hEzdDLL = LoadLibrary(_T("MarkEzd.dll"));

lmc1_Initial=(LMC1_INITIAL)GetProcAddress(hEzdDLL, _T("lmc1_Initial"));
lmc1_Close=(LMC1_CLOSE)GetProcAddress(hEzdDLL, _T("lmc1_Close"));
lmc1_LoadEzdFile=(LMC1_LOADEZDFILE)GetProcAddress(hEzdDLL,_T("lmc1_LoadEzdFile"));  
lmc1_Mark=(LMC1_MARK)GetProcAddress(hEzdDLL,_T("lmc1_Mark"));

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace Start_Mark
{
    public partial class Form1 : Form
    {
        [DllImport("kernel32.dll")]
        public static extern IntPtr LoadLibrary(string dllToLoad);

        [DllImport("kernel32.dll")]
        public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);

        [DllImport("kernel32.dll")]
        public static extern bool FreeLibrary(IntPtr hModule);

        [DllImport("MarkEzd.dll")]
        [return: MarshalAs(UnmanagedType.I2)]
        public static extern int lmc1_Initial(string strEzCadPath, bool bTestMode, IntPtr hOwenWnd);

        [DllImport("MarkEzd.dll")]
        [return: MarshalAs(UnmanagedType.I2)]
        public static extern int lmc1_Close();

        [DllImport("MarkEzd.dll")]
        [return: MarshalAs(UnmanagedType.I2)]
        public static extern int lmc1_LoadEzdFile(string strFileName);

        [DllImport("MarkEzd.dll")]
        [return: MarshalAs(UnmanagedType.I2)]
        public static extern int lmc1_Mark(bool bFlyMark);

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            IntPtr hEzdDLL = LoadLibrary("MarkEzd.dll");
            IntPtr iplmc1_Initial = GetProcAddress(hEzdDLL, "lmc1_Initial");
            IntPtr iplmc1_Close = GetProcAddress(hEzdDLL, "lmc1_Close");
            IntPtr iplmc1_LoadEzdFile = GetProcAddress(hEzdDLL, "lmc1_LoadEzdFile");
            IntPtr iplmc1_Mark = GetProcAddress(hEzdDLL, "lmc1_Mark");
            int intlmc1_Initial=lmc1_Initial("c:\temp", false, hEzdDLL);
            if (intlmc1_Initial > 0)
            {
                return;
            }
            int intlmc1_LoadEzdFile = lmc1_LoadEzdFile("c:\temp\test.ezd");
            if (intlmc1_LoadEzdFile > 0)
            {
                return;
            }
            int intlmc1_Mark = lmc1_Mark(true);
            if (intlmc1_Mark > 0)
            {
                return;
            }
            int intlmc1_Close = lmc1_Close();
            if (intlmc1_Close > 0)
            {
                return;
            }
            FreeLibrary(hEzdDLL);
        }
    }
}

最佳答案

正确的语法如下。

using System;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Company.Group
{
    public class FuncList
    {
        [DllImport("MarkEzd.dll", EntryPoint = "lmc1_Initial2", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)]
        public static extern int Initialize(string PathName, bool TestMode);
    }
}

关于c# - 在 C# 中加载 C++ DLL，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15707859/