调用C ++从C＃函数​​指针 [英] Call c++ function pointer from c#

问题描述

是否有可能调用C（++）静态函数指针（不是委托）这样

Is it possible to call a c(++) static function pointer (not a delegate) like this

typedef int (*MyCppFunc)(void* SomeObject);

从C＃？

void CallFromCSharp(MyCppFunc funcptr, IntPtr param)
{
  funcptr(param);
}

我需要能够从C＃回调到一些老的C ++类。 C ++进行管理，但这些类不是裁判班（还）。

I need to be able to callback from c# into some old c++ classes. C++ is managed, but the classes are not ref classes (yet).

到目前为止，我还是不知道如何调用从C＃C ++函数指针，这可能吗？

So far I got no idea how to call a c++ function pointer from c#, is it possible?

推荐答案

DTB是正确的。此处Marshal.GetDelegateForFunctionPointer一个更详细的例子。它应该为你工作。

dtb is right. Here a more detailed example for Marshal.GetDelegateForFunctionPointer. It should work for you.

在C ++：

static int __stdcall SomeFunction(void* someObject, void*  someParam)
{
  CSomeClass* o = (CSomeClass*)someObject;
  return o->MemberFunction(someParam);
}

int main()
{
  CSomeClass o;
  void* p = 0;
  CSharp::Function(System::IntPtr(SomeFunction), System::IntPtr(&o), System::IntPtr(p));
}

在C＃中：

public class CSharp
{
  delegate int CFuncDelegate(IntPtr Obj, IntPtr Arg);
  public static void Function(IntPtr CFunc, IntPtr Obj, IntPtr Arg)
  {
    CFuncDelegate func = (CFuncDelegate)Marshal.GetDelegateForFunctionPointer(CFunc, typeof(CFuncDelegate));
    int rc = func(Obj, Arg);
  }
}

这篇关于调用C ++从C＃函数​​指针的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！