Answer Posted / sunil choubey
COM DLL has to implement at least IUnknown inteface, however this is not the restriction of regulare DLL.
You have to register COM DLL by using regsvr32 utility, and its information is store in windows registry, this is not in case of normal DLL.
You have to put normal dll in path or current directory, but not in case of COM DLL.
You can use COM DLL in any language, but if you want to do it with normal dll then you have to export plan function, this should not be Object Oriented. If you try to export classes from normal DLL or make MFC extension then you cant use it in VB and scripting language like VB Script.
By making COM DLL you have to export its interface and write it in IDL file and in case of normal DLL you do it either in DEF file or using _declspec(export) with function or class name.
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