c++ - 允许 native C++ 组件引发 CLR 异步事件

Question

我需要在我的 native 代码中向 C# 引发异步事件，我已经用作桥接 CLI，实际上我已经通过从 C++/CLI 发送指向函数的指针，但它没有正常工作？我需要知道:1-怎么了？ 2-如何使异步事件不阻塞处理？在此示例中，我需要在每次达到 1000 时引发一个事件，这是我的代码计数.h

typedef void pointertofunc(bool IsOverFlowOccured);
typedef pointertofunc *pointertofuncdelegate;
class count
{

public:
    void startCounting(pointertofuncdelegate);
    count();
    ~count();
};

计数.cpp

void count::startCounting(pointertofuncdelegate)
{
    for (int i = 0; i < 100000; i++)
    {
        //printf("%d \n", i);
        if (i == 1000)
        {
            pointertofuncdelegate(true);
            printf("%d \n", i);
            i = 0;
        }
    }
}

CLR(.h 文件)

public delegate void manageddelegate(bool isworkflowoccured);
ref class CounterRaiseAsynchronousEvent
{
public:
    event manageddelegate^ managedEventHandler;
    CounterRaiseAsynchronousEvent();
    void initialize();
    void raiseEvent(bool eoverFlow);

private:
    count* wrapperObject;
};

CLR(.cpp 文件)

    void CounterRaiseAsynchronousEvent::initialize()
{
    //Create a new delegate and point it to the member function
    manageddelegate^ prDel = gcnew manageddelegate(this, &CounterRaiseAsynchronousEvent::raiseEvent);
    GCHandle gch = GCHandle::Alloc(prDel);
    //Convert the delegate to a function pointer
    IntPtr ip = Marshal::GetFunctionPointerForDelegate(prDel);
    //... and cast it to the appropriate type
    pointertofuncdelegate fp = static_cast<pointertofuncdelegate>(ip.ToPointer());
    //set the native function pointer on the native class
    wrapperObject->startCounting(fp);
}
void CounterRaiseAsynchronousEvent::raiseEvent(bool isOverflowOccurred)
{
    //Do any thing
}

Answer 1

事件源实现异步处理模型通常不是一个好主意——这会强制客户端代码为多线程并进行同步，并且当不同的组件选择不同的模型时会导致复杂情况。

相反，同步调用事件，让订阅者挂起回调并立即返回。这与客户端代码喜欢的任何异步模型兼容，例如 native PostMessage 或 Control.BeginInvoke 或 TPL (async/await) 或工作线程池。