PInvoke C#:函数将函数指针作为参数 [英] PInvoke C#: Function takes pointer to function as argument

问题描述

我想在我的 c# 代码中访问这个函数，这可能吗?所以最后 C++ 代码会调用我的函数并应用名为sFrameofData"的结构.

I'd like to access this function in my c# code, is this possible? so in the end the c++ code would call my function and also apply the struct called "sFrameofData".

C++ 代码:

//The user supplied function will be called whenever a frame of data arrives.
DLL int Cortex_SetDataHandlerFunc(void (*MyFunction)(sFrameOfData* pFrameOfData));

这可能行得通吗?

C# 代码:

[DllImport("Cortex_SDK.dll")]
public extern static int Cortex_SetDataHandlerFunc(ref IntPtr function(ref IntPtr pFrameOfData) );

推荐答案

您想使用与MyFunction"C++ 方法的方法签名匹配的委托.

You want to use a delegate that matches the method signature of your "MyFunction" C++ method.

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void MyFunctionDelegate(IntPtr frame);

[DllImport("Cortex_SDK.dll")]
public extern static int Cortex_SetDataHandlerFunc(
[MarshalAs(UnmanagedType.FunctionPtr)]MyFunctionDelegate functionCallback);

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