从 C++/CLI 调用 C# dll 函数 [英] Call C# dll function from C++/CLI

问题描述

我有一个 C# dll.代码如下:

I have a C# dll. The code is below:

public class Calculate
{
    public static  int GetResult(int arg1, int arg2)
    {
        return arg1 + arg2;
    }

    public static  string GetResult(string arg1, string arg2)
    {
        return arg1 + " " + arg2;
    }

    public static   float GetResult(float arg1, float arg2)
    {
        return arg1 + arg2;
    }

    public Calculate()
    {
    }
}

现在，我打算以这种方式从 C++ 调用这个 dll.

Now, I am planning to call this dll from C++ on this way.

[DllImport("CalculationC.dll",EntryPoint="Calculate", CallingConvention=CallingConvention::ThisCall)]
extern void Calculate();

[DllImport("CalculationC.dll",EntryPoint="GetResult", CallingConvention=CallingConvention::ThisCall)]
extern int GetResult(int arg1, int arg2);

这里是调用GetResult的函数

Here is function where is called GetResult

private: System::Void CalculateResult(int arg1, int arg2)
{
    int rez=0;

    //Call C++ function from dll
    Calculate calculate=new Calculate();
    rez=GetResult(arg1,arg2);
}

我收到错误消息:语法错误:标识符‘计算’".有人能帮我解决这个可怕的错误吗?

I got the error : "syntax error : identifier 'Calculate'". Can someone help me with this terrible error?

推荐答案

您必须使用 C++ CLI，否则无法调用 DllImport.如果是这种情况，您可以只引用 c# dll.

You must be using c++ CLI, otherwise you could not call DllImport. If that is the case you can just reference the c# dll.

在 C++ CLI 中，您可以执行以下操作:

In c++ CLI you can just do as follows:

using namespace Your::Namespace::Here;

#using <YourDll.dll>

YourManagedClass^ pInstance = gcnew YourManagedClass();

在带有输出程序集YourDll.dll"的 c# 项目中定义了YourManagedClass".

where 'YourManagedClass' is defined in the c# project with output assembly 'YourDll.dll'.

** 编辑 **添加了您的示例.

** EDIT ** Added your example.

这就是您的示例在 CLI 中的外观(为清楚起见，我假设 GetResult 不是静态函数，否则你只需调用Calculate::GetResult(...)

This is how your example needs to look like in CLI (for clarity I am assuming that G etResult is not a static function, otherwise you would just call Calculate::GetResult(...)

private: System::Void CalculateResult(int arg1, int arg2)
{
    int rez=0;
    //Call C++ function from dll
    Calculate^ calculate= gcnew Calculate();
    rez=calculate->GetResult(arg1,arg2);   
}

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