Currently, I am dealing with an issue that is driving me close to the edge
In my HTA, I have a JavaScript code that needs to interact with various COM objects
var com1= new ActiveXObject("progID");
While this setup works smoothly with most COM objects, it encounters trouble with one particular object that implements both IComOne and IComTwo interfaces
Is there a way to instruct the com1 object to only utilize the "IComOne" interface?
I would greatly appreciate any suggestions...
I haven't had to dabble in script and COM for quite some time now, but from what I remember, script was only able to access methods provided by the IDispatch interface. If your component doesn't have this support, then you won't be able to utilize it fully. It's not as simple as calling IUnknown.AddRef on any random object.
To gain a deeper understanding of your component, consider using the OLE/COM object viewer tool found in the Windows SDK.
In the scenario where both interfaces are dual, each interface will have its own implementation of IDispatch. This means that querying for IDispatch on IComOne will not be the same as querying for IDispatch on IComTwo.
The variable com1 will reference the IDispatch implementation on the default interface, let's say IComOne. To access the IDispatch implementation on IComTwo, you can call a method on IComOne that returns an instance casted to IComTwo (the QueryInterface for IDispatch on the return value will happen automatically). So, if you have var com1 = ..., then you can do
var com2 = com1.GetSecondInterface()If the "progID" is a closed external component, you may also create a "casting helper" to achieve the same result.
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