在C#中调用VC ++ DLL函数 [英] calling VC++ DLL functions in C#

问题描述

我有一个VC ++ dll，我想用它从c#调用.
我有一个用C ++定义的类.

Hi,

I have a VC++ dll which I want to use to call from c#.
I have a class defined in C++.

/* -----------------------*/

class PropertyPageDlg : public CPropertyPage

{

   public:

      __declspec(dllexport) void glen();
 };

extern "C"

{
  
     __declspec(dllexport) void CZippyPlus_PropertyPageDlg::glen()

   {
 
      printf("\n Hi Hello World ");
      getchar();

    }
}

我想在c#中调用此OnBtnDisconnect函数.

这是我所做的.

I want to call this OnBtnDisconnect function in c#.

Here is what I have done .

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


namespace C_sharp
{
    class Program
    {
       [DllImport("PropertySheetApp.dll")]
         public static extern void glen();
        static void Main(string[] args)
        {
            Console.WriteLine("This is C# program");
            glen();
            
        }
     }
}

运行c#程序时出现以下错误.

C_sharp.exe中发生了类型为"System.EntryPointNotFoundException"的未处理的异常

附加信息:在DLL"PropertySheetApp.dll"中找不到名为"glen"的入口点.

感谢您对此提供的任何帮助.

谢谢

I am getting the following error while running c# program.

An unhandled exception of type ''System.EntryPointNotFoundException'' occurred in C_sharp.exe

Additional information: Unable to find an entry point named ''glen'' in DLL ''PropertySheetApp.dll''.

Any help on this is appreciated.

Thanks

推荐答案

无法在C#代码中直接使用C ++类(非托管代码！).您可以间接使用PInvoke来访问您的类型.

基本模式是为C ++类的每个成员函数创建一个关联的非成员函数，该函数调用该成员函数，然后从C#导入并调用该成员.

通常，下一个示例是一个基本示例:

在VC ++中，您应该具有:

类Foo {
公众:
int Bar();
};
Foo * Foo_Create(){返回新的Foo(); }
int Foo_Bar(Foo * pFoo){return pFoo-> Bar(); }
void Foo_Delete(Foo * pFoo){删除pFoo; }

现在将这些方法用于C#代码:

[DllImport("Foo.dll")]
公共静态外部IntPtr Foo_Create();

[DllImport("Foo.dll")]
公共静态外部int Foo_Bar(IntPtr value);

[DllImport("Foo.dll")]
静电静态外部空隙Foo_Delete(IntPtr value);

Hi,

There is no way to directly use a C++ class (unmanaged code!) in C# code. You can use PInvoke in an indirect fashion to access your type.

The basic pattern is that for every member function of you C++ class, to create an associated non-member function which calls the member function, then from C# to import and invoke that member.

In generally a basic example is the next one:

In VC++ you should have:

class Foo {
public:
int Bar();
};
Foo* Foo_Create() { return new Foo(); }
int Foo_Bar(Foo* pFoo) { return pFoo->Bar(); }
void Foo_Delete(Foo* pFoo) { delete pFoo; }

Now using these methods into C# code:

[DllImport("Foo.dll")]
public static extern IntPtr Foo_Create();

[DllImport("Foo.dll")]
public static extern int Foo_Bar(IntPtr value);

[DllImport("Foo.dll")]
pulbic static extern void Foo_Delete(IntPtr value);

这篇关于在C#中调用VC ++ DLL函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！