c# - 将此 DLL 包含从 VB.net 翻译成 C#

Question

这已被问过一百万次，但我仍然无法让它工作。所以我问: 我有一个 DLL 导入(非托管 C/C++ 代码)，我想从 C# 调用但无法开始工作。我正在从 VB.net 移植，那里的代码(有效)如下:

Module Module1
    Public Declare Function autodetect_SearchAxis Lib "autodetect.dll" (ByVal onusb As Boolean, ByVal searchsubadress As Byte, ByRef portname As String, ByRef devicelocation As String) As Integer
    Public AxisCom As String
    Public AxisAdress As Byte = 1
    Public Dummy As String
    Public rc As Integer
    Sub Main()
        Dummy = Space(1024)
        AXISCom = Space(1024)
        rc = autodetect_SearchAxis(False, AxisAdress, Dummy, AxisCom)
        Debug.WriteLine("rc: " + rc.ToString())
        Debug.WriteLine("AxisCom: " + AxisCom.ToString())
    End Sub
End Module

我手头没有我的 C# 代码尝试 ATM，但我已经使用 SttingBuilder 类尝试了各种版本。如果有人可以帮助我将此代码移植到 C#，我将不胜感激。提前致谢!

编辑:

我现在有了 DLL 函数的签名:

int _stdcall autodetect_SearchAxis(bool onusb, BYTE searchsubadress, char* &portname, char* &devicelocation)

David Heffernan 建议的解决方案部分有效。它正在工作(我没有错误消息)，但返回的字符串是垃圾。本质上这是我已经在工作的(具有相同的垃圾输出)。我不确定这是否与字符编码有关(我没有收到任何错误消息)。希望签名对您有所帮助。

Answer 1

基本上应该是:

using System.Diagnostics;
using System.Runtime.InteropServices;

public static class Module1
{
    [DllImport("autodetect.dll")]
    public static extern int autodetect_SearchAxis(bool onusb, byte searchsubadress, ref string portname, ref string devicelocation);

    public static string AxisCom;

    public static byte AxisAddress = 1;

    public static string Dummy;

    public static int rc;

    public static void Main()
    {
        Dummy = new string(' ', 1024);
        AxisCom = new string(' ', 1024);
        rc = autodetect_SearchAxis(false, AxisAddress, ref Dummy, ref AxisCom);
        Debug.WriteLine("rc: " + rc.ToString());
        Debug.WriteLine("AxisCom: " + AxisCom.ToString());
    }
}