Consecutive interface function IDs
Question
I have a COM object interface in midl like
interface InterfaceName : IDispatch
{
[id(1)] HRESULT FunA(...);
[id(2)] HRESULT FunB(...);
[id(3)] HRESULT FunC(...);
}
Are the ids required to be consecutive? Or can I define it like
interface InterfaceName : IDispatch
{
[id(1)] HRESULT FunA(...);
[id(3)] HRESULT FunB(...);
[id(5)] HRESULT FunC(...);
}
Compiling the second version seems to be fine but will there occur any problems at runtime?
La solution
Actual id values are arbitrary numbers. They do not have to be consecutive; they just have to be unique. Zero and negative values are, by convention, reserved for certain special methods. Apart from that, there are no rules.
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