StackOverflow2013

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2013-03-21T00:06:23.790
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2013-03-21T00:06:23.790
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You can turn your VBScript function into <code>IDispatch*</code> pointers. For example the <code>onreadystatechange</code> handler in the <code>Microsoft.XMLHTTP</code> object. <pre><code>Option Explicit Dim xmlhttp Function OnReadyStateChange WScript.Echo "ReadyState: " & xmlhttp.readyState End Function Set xmlhttp = CreateObject("Microsoft.XMLHTTP") xmlhttp.onreadystatechange = GetRef("OnReadyStateChange") xmlhttp.open "GET", "http://stackoverflow.com", True xmlhttp.send WScript.Echo "Waiting for 20 seconds to allow OnReadyStateChange events to finish." WScript.Sleep 20000 WScript.Echo "Done!" </code></pre> Outputs: <pre><code>ReadyState: 1 Waiting for 20 seconds to allow OnReadyStateChange events to finish. ReadyState: 2 ReadyState: 3 ReadyState: 4 Done! </code></pre> Extracting the IDL for <code>C:\Windows\System32\msxml3.dll</code> shows we're setting an <code>IDispatch*</code> property: <pre><code>[ odl, uuid(ED8C108D-4349-11D2-91A4-00C04F7969E8), helpstring("IXMLHTTPRequest Interface"), dual, oleautomation ] interface IXMLHTTPRequest : IDispatch { // ... [id(0x0000000e), propput, helpstring("Register a complete event handler")] HRESULT onreadystatechange([in] IDispatch* rhs); }; </code></pre> When adapting this approach to your C++ application, your calling code will need to use <code>IDispatch::Invoke</code> with a DISPID of <code>DISPID_VALUE</code>, for example: <pre><code>// IDispatch* pOnReadyStateChange <-- set from VBScript. HRESULT hr = S_OK; CComVariant vResult; EXCEPINFO ei = { }; DISPPARAMS dispParams = { NULL, 0, 0, 0 }; hr = pOnReadyStateChange->Invoke( DISPID_VALUE, IID_NULL, 0, DISPATCH_METHOD, &dispParams, &vResult, &ei, NULL); </code></pre>
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1. POExposing COM events to VBScript (ATL)
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1. USStephen Quan
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