Inside COM+: Base Services by Guy Eddon

By Guy Eddon

An in-depth architectural evaluate of COM+ part applied sciences for firm builders, this publication deals an in depth glance via delivering implementation information and pattern code. content material comprises scalability, queued elements and MSMQ, the in-memory database, and role-based protection.

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Another problem with QueryInterface relates to assigning a type of interface pointer to a pointer that was declared to point to a different type of interface. See if you can figure out what's wrong with this code: ISum* pSum; hr = pUnknown->QueryInterface(IID_IUnknown, (void**)&pSum); int sum; pSum->Sum(2, 3, &sum); // Uh-oh! The QueryInterface call requests the IUnknown interface (IID_IUnknown), but it stores the pointer in pSum. The pSum function is a pointer to an interface of type ISum, not IUnknown, but the compiler thinks this is all right because pSum is explicitly cast to void**.

You might be wondering why DllGetClassObject even bothers with the IID parameter of the IClassFactory interface. After all, if all objects are instantiated by a class factory, why not simply hard-code IID_IClassFactory and rename the DllGetClassObject function DllGetClassFactory? The answer is that some objects might have special requirements not met by IClassFactory and might want to implement a custom activation interface. A custom activation interface is useful when a standard implementation of IClassFactory just won't do.

The OLESelfRegister flag is shown in boldface in Listing 2-8. dll\0" "ProductName", "Inside COM+\0" "ProductVersion", "2, 0, 0, 1\0" "OLESelfRegister", "\0" END END BLOCK "VarFileInfo" BEGIN VALUE "Translation", 0x0409, 1200 END END Listing 2-8. A resource file that you can use to determine whether a component supports self-registration. dsw workspace file in the Samples\The IUnknown Interface folder and build the Component with Registration project. Then use RegSvr32 to test the new functionality.

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