呼叫 C++ C# 的模板函数

发布于 2024-11-08 07:47:51 字数 326 浏览 0 评论 0原文

我对 C# 的了解非常有限。我的目标是为我的 C# 同事提供 C++ dll API。由于遗留原因，该 dll 必须采用 C++ 语言。

问题 - C++ 模板函数（如下所示，来自 VS）可以在 C# 中封送吗？

class  __declspec(dllexport) Foo
{
public: 
    template <typename T> T* getFoo(T* fooData){return fooData;};
};

如果没有，有什么建议吗？传递到模板函数的每个类型是否都应该有自己的函数，以便 C# 可以对其进行封送？

原文

I have very limited knowledge of C#. My goal is to provide a C++ dll API to my C# co-worker. The dll has to be in C++ for legacy reasons.

Question - Can a C++ template function (shown below from VS) be marshaled in C#?

class  __declspec(dllexport) Foo
{
public: 
    template <typename T> T* getFoo(T* fooData){return fooData;};
};

If not, any suggestions? Should each type that is passed into the template function have their own function so C# can marshal it?

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你爱我像她 2024-11-15 07:47:53

所以几周后，我能够运行一些东西，我想我会与团队分享它。（请原谅伪代码的出现）。我基本上自学了 C# 而不是 C++/CLI。

记住这个问题 - C++ 模板函数（如下所示，来自 VS）可以在 C# 中封送吗？

我的解决方法如下：对 C++ 函数进行封送非托管 C# 调用，这些函数可以将调用转换为模板方法。

这是代码：

//C++ code
//C++ Header
class  __declspec(dllexport) Foo
{
    public: 
        template <typename T> T* getFoo(T* fooData){return fooData;};
};

extern "C" __declspec(dllexport) void call_getFoo(Foo* pFoo, void* pfooData, int fooId)
{
    switch(fooId)
    {
        case(ENUM::1) : //Use an enum here for a better switch statement.       
        {   
            //Cast the void pointer to a specific type so the template knows how to use it.
            pFoo->getFoo((*TypeCast*)pfooData);
        break;
        }
    }
}

//C# Code
internal static class UnsafeNativeMethods
{
    const string _dllLocation = "Foo.dll";

    [DllImport(_dllLocation)]
    static public extern void call_getFoo(IntPtr pFoo, IntPtr pfooData, int fooId);           
}

//In a C# method
...
...
//Marshal Up a C# data type to a pointer for C++.
*YOUR TYPE HERE* myType;
int rawsize = Marshal.SizeOf(myType);
IntPtr pfooData = Marshal.AllocHGlobal(rawsize);
Marshal.StructureToPtr(myType,pfooData,true);

//call the C++ dll
UnsafeNativeMethods.call_getFoo(pFoo, pfooData, fooId);

//Convert Ptr Back To myType
myType = (*YOUR TYPE HERE*) Marshal.PtrToStructure(pfooData, typeof(*YOUR TYPE HERE*));
...
...

希望有帮助！

So after a few weeks I was able to get something running and I thought I would share it with the group. (Pardon the Pseudo code Appearance). I basically taught myself C# instead of C++/CLI.

Remember the Question - Can a C++ template function (shown below from VS) be marshaled in C#?

My work around is as followed: Make marshaled unmanaged C# calls to C++ functions that can translate calls to the template method.

Here is the Code:

//C++ code
//C++ Header
class  __declspec(dllexport) Foo
{
    public: 
        template <typename T> T* getFoo(T* fooData){return fooData;};
};

extern "C" __declspec(dllexport) void call_getFoo(Foo* pFoo, void* pfooData, int fooId)
{
    switch(fooId)
    {
        case(ENUM::1) : //Use an enum here for a better switch statement.       
        {   
            //Cast the void pointer to a specific type so the template knows how to use it.
            pFoo->getFoo((*TypeCast*)pfooData);
        break;
        }
    }
}

//C# Code
internal static class UnsafeNativeMethods
{
    const string _dllLocation = "Foo.dll";

    [DllImport(_dllLocation)]
    static public extern void call_getFoo(IntPtr pFoo, IntPtr pfooData, int fooId);           
}

//In a C# method
...
...
//Marshal Up a C# data type to a pointer for C++.
*YOUR TYPE HERE* myType;
int rawsize = Marshal.SizeOf(myType);
IntPtr pfooData = Marshal.AllocHGlobal(rawsize);
Marshal.StructureToPtr(myType,pfooData,true);

//call the C++ dll
UnsafeNativeMethods.call_getFoo(pFoo, pfooData, fooId);

//Convert Ptr Back To myType
myType = (*YOUR TYPE HERE*) Marshal.PtrToStructure(pfooData, typeof(*YOUR TYPE HERE*));
...
...

Hope that helps!

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