C ++ API Dll中的事件 [英] Event in C++ API Dll

问题描述

我有一个c ++ dll，可从WinSNMP获取SNMP陷阱，然后在我的c#代码(c#中的委托)中调用函数.
一切正常.
我的问题是我希望C ++ dll每次在新线程中调用我的c#委托.有什么方法可以做到而无需在c ++中调用CreateThread.我之所以这样问，是因为我认为要购买一个调用CreateThread的程序，就必须跟踪线程的句柄然后将其关闭(这是太多的工作)
我需要类似异步事件的东西！有可能吗?

Hi,

I have a c++ dll which get SNMP traps from WinSNMP and then call a function in my c# code(a delegate in c#).
Every thing works fine.
My problem is I want the c++ dll call my c# delegate every time in a new thread. Is there any way to do that without calling CreateThread in c++. I ask this because as I think buy calling CreateThread I have to track the handle of thread and then close it ( and it is too much work)
I need something like async event! Is it possible?

typedef void (__stdcall *callback_StateChangeReceived)(char* Name, char* Text , char* DateTime);

callback_StateChangeReceived CallbackStateChangeReceived;
// I first call this function from C# to set my callback function
bool  __stdcall  SetCallbackStateChangeReceived(callback_StateChangeReceived Callback)
{
    CallbackStateChangeReceived =Callback;
    return true;
}
//And then I call the callback in a appropriate function, something like this:

while(SnmpMgrGetTrapEx(&enterprise,&AgentIPAddress, &IPAddress, &genericTrap,&specificTrap,&community, &timeStamp, &variableBindings))
{
  // Some Code here
  CallbackStateChangeReceived (Name,Text,sDateTime);
  // I do not want this function to be blocked.
}

每当我调用CallbackStateChangeReceived时，我都需要它，它会立即返回并且不会被我的C#代码阻止. (我不想更改c#代码.)

谢谢.

I need when ever I call CallbackStateChangeReceived, It returns immediately and not to be blocked by my c# code. (I do not want to change the c# code.)

Thanks.

推荐答案

您无需跟踪使用

You do not need to track the handle of a thread created with the CreateThread Function (Windows)[^] API: you need to do it only if you have to get the exit code of that thread.

Then you can simply create a new thread from your C++ code, and call CloseHandle on the returned handle immediately (doing this doesn''t abort the newly created thread).

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