从C＃调用非托管C ++

问题描述

我正在带有.NET 4.0的Win7上运行VS2012。
我尝试了以下操作：

I'm running VS2012 on Win7 with .NET 4.0.I've tried the following:

• 创建C ++ DLL项目


• 已检查＼ ＼未选中导出符号框


• 我确保平台目标相同。就我而言，win32


• 我在需要的地方添加了必要的extern C和__declspec（dllexport）。


• 我已经成功编译了我的DLL并尝试在C＃项目中引用它。

• Create C++ DLL project
• Checked\Unchecked the export symbols box
• I've made sure my platform targets are the same. In my case, win32
• I've added the necessary extern "C" and __declspec(dllexport) where needed.
• I've successfully compiled my DLL and have tried to reference it in a C# project.

不幸的是，我收到一条错误消息，告诉我无法添加它并且我需要确保它是有效的程序集或COM对象。

Unfortunately, I get an error telling my it can't be added and that I need to make sure it's a valid assembly or COM object.

我已经放弃了尝试导出代码的工作，因此我很满意只是示例 42通过了！

I've given up trying to get my code to export, so I'd be happy with just the example "42" getting through!

我尝试使用dumpbin对其进行查看，它可以正确导出符号：

I've tried looking at it with dumpbin and it is correctly exporting symbols:

1    0 00011023 ??0CEvolutionSimulator@@QAE@XZ
2    1 00011127 ??4CEvolutionSimulator@@QAEAAV0@ABV0@@Z
3    2 00011005 ?GetNumber@CEvolutionSimulator@@QAEHXZ
4    3 0001104B ?fnEvolutionSimulator@@YAHXZ
5    4 00017128 ?nEvolutionSimulator@@3HA

我的脑子里没有想法。有人可以启发我吗？无论尝试什么，我似乎都会遇到此错误。

My brain is fresh out of ideas. Can someone please enlighten me? I seem to get this error no matter what I try.

推荐答案

您需要调用驻留在C ++ DLL中的函数（已导出）使用 DllImportAttribute 从.NET代码中使用外部 C ）。您不能像.NET程序集一样引用C ++ DLL，也不能使用DLL中的类，只能使用 DllImport ed的C类函数。

You need to pinvoke the functions residing in your C++ DLL (exported using extern "C") from your .NET code using the DllImportAttribute. You can't reference your C++ DLL like a .NET assembly, and you can't use classes from the DLL, only DllImported C-like functions.

来自 msdn ：

using System;
using System.Runtime.InteropServices;

class Example
{
    // Use DllImport to import the Win32 MessageBox function.
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);

    static void Main()
    {
        // Call the MessageBox function using platform invoke.
        MessageBox(new IntPtr(0), "Hello World!", "Hello Dialog", 0);
    }
}

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