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POEvent Handling in C++/CLI
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3477673
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3478009
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CreationDate
2010-08-13T14:15:02.603
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2010-08-13T14:49:51.367
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I have a function, singleFrameEventHandler, that I wish to be called when a certain event, OnNewFrame, occurs. After doing some research, it seemed to me that functions which handle events have a void return type and take a parameter of the type that contains the event. From what I could find online, that is done like this: Function declaration: <pre><code>void singleFrameEventHandler(IAFrame ^ frame); </code></pre> When the function is assigned to handle the event: <pre><code>iaframe->OnNewFrame += &singleFrameEventHandler; </code></pre> When I try to compile the code containing the above segments, I get the following error: <pre><code>error C2664: 'Spiricon::BeamGage::Automation::Interfaces::IAFrame::OnNewFrame::add' : cannot convert parameter 1 from 'void (__clrcall *)(Spiricon::BeamGage::Automation::Interfaces::IAFrame ^)' to 'Spiricon::BeamGage::Automation::Interfaces::newFrame ^' No user-defined-conversion operator available, or There is no context in which this conversion is possible </code></pre> The OnNewFrame is of type Spiricon::BeamGage::Automation::Interfaces::newFrame, which unfortunately has no documentation beyond being described as "The event that is called when a new frame is available." In the object browser, I can find some information about it: <pre><code>public delegate newFrame: public System.IAsyncResult BeginInvoke(System.AsyncCallback callback, System.Object object) public System.Void EndInvoke(System.IAsyncResult result) public System.Void Invoke() public newFrame(System.Object object, System.IntPtr method) </code></pre> The newFrame constructor (?) seems to be the best bet, as it appears to take a method pointer, but when I try to use it like this: <pre><code>iaframe->OnNewFrame += gcnew newFrame(iaframe, &singleFrameEventHandler); </code></pre> I get the following error: <pre><code>error C3352: 'singleFrameEventHandler' : the specified function does not match the delegate type 'void (void)' </code></pre> Does this mean that my function has to take no parameters? If so, how would I get information about the event?
Tags
<.net><events><event-handling><c++-cli>
Title
Event Handling in C++/CLI
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1. PO
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1. USEric Finn
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1. PO
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2. PO
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