Hello, I'm developing CFPlugIn for Apple's iOS on Mac X using XCode 3.2 (gcc 4.2.1) According to Apple's document, the CFPlugIn is COM-compatible. http://developer.apple.com/library/mac/#documentation/CoreFoundation/Conceptual/CFPlugIns/Concepts/com.html#//apple_ref/doc/uid/20001158-CJBEJBHH BUT, According to the comment for IUnknown in CoreFoundation/CFPlugInCOM.hÂ, the compatibility depends on compiler. /* This a definition of IUnknown as pure abstract virtual C++ class. This class will work only with compiler that can product COM-compatible object layout for C++ classes. egcs can not do this. MetroWerks can do this (if you subclass from __comobject) */ My question is: "Is gcc the compiler that can product COM-compatible object layout for C++ class?" You may also refer to this thread for the answers from MSDN for COM's C/C++ compatibility http://social.msdn.microsoft.com/Forums/en-US/vcmfcatl/thread/72cf41cb-4d73-4c5b-a986-b1c857a30fd5 Sincerely, Raymond Yang.
