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Chakra and IDispatch based indexed properties


Chakra and IDispatch based indexed properties

By : Hongxuan Liu
Date : November 19 2020, 03:01 PM
this one helps. I have confirmed a way to perform this with the desired syntax (App.Event['foo'] = someHandler;). As mentioned I already knew JavaScript treats name['foo'] as a member lookup on name
Have the App object implement a propget for Event that returns an object with a custom (non-dual interface) IDispatch implementation. That object keeps a map of names to DISPIDs and whenever an unknown name is requested via GetIDsOfNames a previously unassigned DISPID is returned.
code :


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Mnesia: how to use indexed operations correctly when selecting rows based on criteria involving multiple, indexed column

Mnesia: how to use indexed operations correctly when selecting rows based on criteria involving multiple, indexed column


By : Poultergiest
Date : March 29 2020, 07:55 AM
With these it helps One way, which will probably help you, is to look at QLC queries. These are more SQL/declarative and they will utilize indexes if possible by themselves IIRC.
But the main problem is that indexes in mnesia are hashes and thus do not support range queries. Thus you can only efficiently index on the type field currently and not on the last_update field.
Does IDispatch::Invoke(DISPATCH_PROPERTYGET) increment the reference count on the IDispatch interface returned?

Does IDispatch::Invoke(DISPATCH_PROPERTYGET) increment the reference count on the IDispatch interface returned?


By : michael keller
Date : March 29 2020, 07:55 AM
it should still fix some issue If your pVar holds an interface pointer (IUnknown* or IDispatch*), you receive it AddRef'fed already. You are responsible to do a matching release when you are done, which you typically do indirectly just cleaning up the variant: via VariantClear.
code :
CComPtr<IDispatch> pDispatch;
CComVariant vFoo;
HRESULT nFooResult = pDispatch.GetPropertyByName(L"Foo", &vFoo);
CComVariant vBar;
HRESULT nBarResult = pDispatch.GetProperty(DISPID_BAR, &vBar);
Universal property path retriever for indexed/non-indexed properties

Universal property path retriever for indexed/non-indexed properties


By : كرامه مصرى
Date : March 29 2020, 07:55 AM
Does that help My open-source project Xoml has code which does exactly what you need. Take a look at this particular source file.
Also - I think the reason you can't find the property is because default indexers called "Item". Look at line 116.
IDispatch object that responds to all properties?

IDispatch object that responds to all properties?


By : user3793498
Date : March 29 2020, 07:55 AM
Hope this helps You need to override the GetIDsForNames methods with an appropriate implementation that returns a valid DISPID for any input parameters. Then override the Invoke method to ensure to return the correct value based on the dispatch id.
Getting an access to Idispatch member of idispatch interface

Getting an access to Idispatch member of idispatch interface


By : user3921476
Date : March 29 2020, 07:55 AM
Any of those help Delphi has built-in support for IDispatch late binding, so you do not need to call Invoke() directly. Just access the members like normal properties, and Delphi will call Invoke() behind the scenes for you.
If you want to call Invoke() directly, then please show your actual code that is failing. An AV is likely due to a bug in your code rather than in the OCX itself.
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