在本机C ++ dll中触发事件并捕获C ++/CLI [英] Fire an event in native C++ dll and catch in C++/CLI

问题描述

大家好！
有没有办法在C ++/CLI中处理本机C ++事件?我应该怎么做钩子?
我几乎整天都在互联网上进行搜索，但没有找到答案.我希望你有什么主意.

Hello guys!
Is there a way to handle a native C++ event in C++/CLI? How should I make the hook?
I searched almost all day on the internet but haven''t found the answer. I hope you have any idea.

class Native{
public:
	__event void myEvent(int i);
	void fireEvent(){
		__raise myEvent(1598);
	};
};

public ref class Managed{
	Native* nativeObject;
public:
	void fireEventHandler(int i){
                printf("Event handled!\n");
        };

	Managed(){
		nativeObject=new Native();
		__hook(&Native::myEvent, nativeObject, &Managed::fireEventHandler );
	};
};

如果我尝试对此进行编译，则会出现错误:

If I try to compile this, I get an error:

error C3731: incompatible event 'void Native::myEvent(int)' and handler 'void Managed::fireEventHandler(int)'; event source and event handler must have the same event type.
1>          The event type of 'Native' is 'native'.
1>          The event type of 'Managed' is 'managed'.

在我的应用程序中，本机类在没有\ clr选项的情况下在单独的DLL中编译，因此我无法保存对托管对象的引用.

In my application, the native class is compiled in separate DLL without a \clr option, so I cannot hold a reference to managed object.

Thank you in forward!

推荐答案

希望这会有所帮助

http://msdn.microsoft.com/en-us/library/367eeye0 (v = VS.100).aspx [

Hope this will help

http://msdn.microsoft.com/en-us/library/367eeye0(v=VS.100).aspx[^]

谢谢Lakamraju，实际上我昨天晚上自己找到了解决方案，但是这篇文章也对我有所帮助，因为我没考虑过垃圾回收器的迁移.
我的解决方案在这里:

Thank you Lakamraju, actually I''ve found the solution myself yesterday evening, but this article helped me also, because I didn''t think about garbage collector relocation.
My solution is here:

// EventTesting.cpp : main project file.

#include "stdafx.h"
#include "stdio.h"

using namespace System;
using namespace System::Runtime::InteropServices;

class Native{
public:
	void (*myEvent)(int i); // function pointer declaration 
	Native(){
		myEvent=NULL;
	}
	void fireEvent(int i){
		if(myEvent!=NULL) myEvent(i);// calling function thru pointer
	};
	void setmyEventHandler(void (*func)(int i)){
		myEvent = func;// Initializing the function pointer with the incoming one
	}

};

private delegate void myEventDelegate(int i);

public ref class Managed{
	Native* nativeObject;
	myEventDelegate ^ del;
	GCHandle delH;
public:
	void fireEventHandler(int i){
		printf("EVENT FIRED %d\n",i);
	};

	Managed(){
		nativeObject=new Native();
		del = gcnew myEventDelegate(this, &Managed::fireEventHandler);
		delH = GCHandle::Alloc(del);
		System::IntPtr d1 = System::Runtime::InteropServices::Marshal::GetFunctionPointerForDelegate(del);
		nativeObject->setmyEventHandler(( void(*)(int))d1.ToPointer());// Calling unmanged library function to initialize function pointer 
	};
	~Managed(){	//Cleanup
		nativeObject->setmyEventHandler(NULL);
		delete nativeObject;
		delH.Free();
	}
	void testEvent(){
		nativeObject->fireEvent(1598);
	}
};


int main(array<system::string xmlns:system="#unknown"> ^args)
{
    Managed^ managedClass = gcnew Managed;
    GC::Collect();
    managedClass->testEvent();
    return 0;
}</system::string>

此解决方案的唯一问题是我们只能注册"一个事件处理程序" ...实际上这不是一个事件，只是一个回调.
再次感谢您！

The only problem with this solution is that we can "register" only one "event handler"... actually this is not an event, just a callback.
Thank you once again!

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