從Native C++使用受管dll中的對象

Question

我剛剛開始從C＃編寫託管dll。我正在嘗試從msdn這example。該示例演示了我們如何通過本機C++調用簡單方法。然而，我擴展了這個例子並添加了一個名爲CheckCar的簡單方法。我的問題是如何將我使用CheckCar方法在C++

這是C＃代碼，我有

public class car 
{ 
    public string CarMake { get; set; } 
    public int CarModel { get; set; } 
} 

public interface ICalculator 
{ 
    int Add(int Number1, int Number2); 
    int Multiply(int a, int b); 
    car CheckCar(car c); 
}; 

public class ManagedClass : ICalculator 
{ 
    public int Add(int Number1, int Number2) 
    { 
     return Number1 + Number2; 
    } 

    public int Multiply(int a, int b) 
    { 
     return a * b; 
    } 
    public car CheckCar(car c) 
    { 
     if(c.CarMake.Equals("honda")) 
     { 
      car _c = new car(); 
      _c.CarMake = "Honda"; 
      _c.CarModel = 1232121; 
      return _c; 
     } 
     else 
     { 
      return null; 
     } 
    } 
} 

這是C++代碼

// Initialize COM. 
    HRESULT hr = CoInitialize(NULL); 

    // Create the interface pointer. 
    ICalculatorPtr pICalc(__uuidof(ManagedClass)); 

    long lResult = 0; 

    // Call the Add method. 
    pICalc->Add(5, 10, &lResult); 
    wprintf(L"The result is %d", lResult); 

    // Uninitialize COM. 
    CoUninitialize(); 

這是我的AssemblyInfo看起來像

// General Information about an assembly is controlled through the following 
// set of attributes. Change these attribute values to modify the information 
// associated with an assembly. 
[assembly: AssemblyTitle("sManagedDLL")] 
[assembly: AssemblyDescription("")] 
[assembly: AssemblyConfiguration("")] 
[assembly: AssemblyCompany("")] 
[assembly: AssemblyProduct("sManagedDLL")] 
[assembly: AssemblyCopyright("Copyright © 2013")] 
[assembly: AssemblyTrademark("")] 
[assembly: AssemblyCulture("")] 

// Setting ComVisible to false makes the types in this assembly not visible 
// to COM components. If you need to access a type in this assembly from 
// COM, set the ComVisible attribute to true on that type. 
//[assembly: ComVisible(false)] 
[assembly: ComVisible(true)] 
[assembly: AssemblyDelaySign(false)] 
[assembly: AssemblyKeyFile("..\\..\\..\\MyKeyFile.SNK")] 

// The following GUID is for the ID of the typelib if this project is exposed to COM 
[assembly: Guid("41fc209d-a359-45d7-bf05-b1d93690824d")] 

// Version information for an assembly consists of the following four values: 
// 
//  Major Version 
//  Minor Version 
//  Build Number 
//  Revision 
// 
// You can specify all the values or you can default the Build and Revision Numbers 
// by using the '*' as shown below: 
// [assembly: AssemblyVersion("1.0.*")] 
[assembly: AssemblyVersion("1.0.0.0")] 
[assembly: AssemblyFileVersion("1.0.0.0")] 

我的問題是如何在C++中調用car CheckCar(car c);方法。我如何訪問C++中的對象車及其屬性？

更新：

更新我的代碼無法訪問IcarPtr在我的C++

這是我更新的C＃代碼

namespace sManagedDLL 
{ 
    [ComVisible(true), InterfaceType(ComInterfaceType.InterfaceIsDual), Guid("13FE32AD-4BF8-495f-AB4D-6C61BD463EA4")] 
    public interface Icar 
    { 
     string GetCarMake(); 
     void SetCarMake(string rx); 

     int GetCarModel(); 
     void SetCarModel(int rx); 
    } 

    [ComVisible(true), ClassInterface(ClassInterfaceType.None), Guid("13FE32AD-4BF8-495f-AB4D-6C61BD463EA5")] 
    public class CarImpl : Icar 
    { 
     private string carmake; 
     private int carmodel; 

     public string GetCarMake(){return carmake;} 
     public void SetCarMake(string rx) { this.carmake = rx;} 

     public int GetCarModel() {return carmodel ;} 
     public void SetCarModel(int rx){this.carmodel = rx;} 
    } 

    public interface ICalculator 
    { 
     int Add(int Number1, int Number2); 
     int Multiply(int a, int b); 
     Icar CheckCar(CarImpl c); 
    } 

    public class ManagedClass : ICalculator 
    { 
     public int Add(int Number1, int Number2) 
     { 
      return Number1 + Number2; 
     } 

     public int Multiply(int a, int b) 
     { 
      return a * b; 
     } 

     public Icar CheckCar(CarImpl c) 
     { 
      if (c.GetCarModel().Equals("honda")) 
      { 
       CarImpl _c = new CarImpl(); 
       _c.SetCarMake("Honda"); 
       _c.SetCarModel(1212132); 
       return _c; 
      } 
      else 
      { 
       return null; 
      } 
     }//end method 
    } 
} 

Answer 1

您必須公開Car作爲COM對象（後與爲ManagedClass和ICalculator所做的相同），然後將其實例化並將其發送到CheckCar方法。

有一個類似的例子here，你可以使用它作爲指導（當然，它是更復雜的，然後你需要什麼，但服務器作爲插圖）。