从C ++ / CLI调用C＃dll函数

问题描述

我有一个 C＃ dll。代码如下：

  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 ++ 调用此dll。

  [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）; 
  

这里是函数，其中调用GetResult

  private：System :: Void CalculateResult（int arg1，int arg2）
 {
 int rez = 0; 
 
 //从dll调用C ++函数
计算calculate = new Calculate（）; 
 rez = GetResult（arg1，arg2）; 
} 
  

我得到错误：syntax error：identifier'Calculate'
有人可以帮我解决这个可怕的错误吗？

解决方案

你必须使用c ++ CLI，否则不能调用DllImport。
如果是这种情况，你只需要引用c＃dll。

在c ++ CLI中，你可以这样做：

 使用命名空间Your :: Namespace :: Here; 
 
 #using< YourDll.dll> 
 
 YourManagedClass ^ pInstance = gcnew YourManagedClass（）; 
 

其中'YourManagedClass'是在c＃项目中定义的输出程序集'YourDll.dll' p>



** EDIT **
添加您的示例。

这是您的示例需要的样子在CLI中（为了清楚起见，我假设G
etResult不是静态函数，否则你只需调用Calculate :: GetResult（...）

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

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()
    {
    }
}

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);

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);
}

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

解决方案

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

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

using namespace Your::Namespace::Here;

#using <YourDll.dll>

YourManagedClass^ pInstance = gcnew YourManagedClass();

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

** EDIT **Added your example.

This is how your example needs to look like in CLI (for clarity I am assuming that GetResult 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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