AddRef_MC endp - раздел Образование, Creating a COM object in ASM
Addref Is A Bit Unusual In That It Does Not Return A Hresult ...
AddRef is a bit unusual in that it does not return a HRESULT (failure code), instead it returns the object count. The return value is undefined in the COM contract, but it is traditional to return the count.
Release not only has to decrement the object count, but when this count reaches zero it must both delete the object, and delete the object count of the dll (such that when the object count goes to zero the dll may be unloaded). Again, this is a trivial implementation:
aggregate REFIID riid... Reference to the interface identifier... Oid ppvObject Address of output variable that receives...
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AddRef_MC endp
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Increments or decrements the lock count
LockServer keeps the class factory instanced (helpful if one has to make numerous object copies). CreateInstance is the workhorse here, it is used to creates the object's "work
MyComObject ENDS
The first point is I have great latitude in defining this structure. The only element that the COM contract imposes on it is that it contain a DWORD pointer to the vtable of functio
Coclass MyCom
{
[default] interface IMyCom;
};
};
This file can be used as
RaiseValue PROTO :DWORD, :DWORD
BIG difference... but for a simple reason. Interfaces written for type libraries are as general as can be, and are directed at clients such as Visual Basic, and VB is designed to ho
Typelib MyCom.tlb
Making it the first resource element is important, as later on we will be using the LoadTypeLib API function to extract this library, and this function expects to find the library a
RaiseValue ENDP
MyCom.dll, the server code
---------------------------------------------------------------------------------------------------------------------To build the
End Sub
Now you can run the application and test the server by clicking the Raise button. Do be careful, there is no error checking to see if you put a valid number in Text2. What you are s
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