Wednesday 2 May 2018

COM - Magic DispIds

So the Microsoft webserver for this page is really slow so I'm recreating this table on this blog post for quick reference. The original is at https://msdn.microsoft.com/en-us/library/windows/desktop/ms221242(v=vs.85).aspx .

Constant/valueDescription
DISPID_COLLECT
-8

The Collect property. You use this property if the method you are calling through Invoke is an accessor function.

DISPID_CONSTRUCTOR
-6

The C++ constructor function for the object.

DISPID_DESTRUCTOR
-7

The C++ destructor function for the object.

DISPID_EVALUATE
-5

The Evaluate method. This method is implicitly invoked when the ActiveX client encloses the arguments in square brackets. For example, the following two lines are equivalent:

x.[A1:C1].value = 10

x.Evaluate("A1:C1").value = 10

DISPID_NEWENUM
-4

The _NewEnum property. This special, restricted property is required for collection objects. It returns an enumerator object that supports IEnumVARIANT, and should have the restricted attribute specified.

DISPID_PROPERTYPUT
-3

The parameter that receives the value of an assignment in a PROPERTYPUT.

DISPID_UNKNOWN
-1

The value returned by IDispatch::GetIDsOfNames to indicate that a member or parameter name was not found.

DISPID_VALUE
0

The default member for the object. This property or method is invoked when an ActiveX client specifies the object name without a property or method.

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