The article explains registration-free COM supported by Windows XP SP2 and also provides custom solution that could be used with older operating systems. The bug appears not constantly but if your application creates a lot of COM objects (several hundreds) the probability is close to 100%. Thereby when PE loader performs the loading of our application it also loads ““, finds reference to “a” assembly there, reads “a.manifest”, finds “file” tag and saves all “com Class”, “typelib” tags and the file name somewhere to the memory.The article includes example of code that uses Microsoft Detours library which replaces keys in registry calls and allows easily tracing of your COM dependencies. This was tested on XP SP2/SP3 and on Vista x64 SP1 (for x32 client application). Then when application calls Co Create Instance or CLSIDFrom Prog ID operation system will read appropriate values from the memory instead the registry.CLSID registry key contains information about location of file implementing this class, class name (Prog ID) and other optional information such as class version or threading model type. The operation system is always looking for a dll first.
For example ATL based Active X use type library to provide calls via Invoke method of IDispatch interface. OS fails to start application and shows standard error message that gives no idea not only what kind of mistake was made but even in which manifest it is.
The problem is that you can’t add keys to the HKEY_CLASSES_ROOT without administrative rights. Fortunately, operation system writes detail explanation of error in the system event log.
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After all operation system will perform Co Create Instance method to create appropriate object. But in real application you probably have assemblies with hundreds of classes.
This method look into the registry key (HKEY_CLASSES_ROOTCLSID) (and subkeys) to define the file containing that class. Microsoft has a command line based Manifest Tool – Unfortunately the XML generated by is not a correct manifest file.
This article briefly explains different methods of using COM without registration of classes in HKEY_CLASSES_ROOT registry key. However it looks like there is a bug and with some probability client application will fail during creating such object.
It gives basic information about COM implementation and oriented on the people with some level of familiarity of Windows programming. The more interesting thing is that during the failure, application will be closed by OS without showing any error!
However if your application uses COM for communication between your components you need to perform registration of your COM objects. Actually you can but it looks like operation system is successfully ignoring it.
In the simplest way registration of COM object is just adding appropriate registry key to the HKEY_CLASSES_ROOTCLSID and sometimes also the registration of a type library HKEY_CLASSES_ROOTTYPELIB. And here is the first interesting thing you’ll probably face.
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