// Common/MyInitGuid.h #ifndef __COMMON_MY_INITGUID_H #define __COMMON_MY_INITGUID_H /* This file must be included only to one C++ file in project before declarations of COM interfaces with DEFINE_GUID macro. Each GUID must be initialized exactly once in project. There are two different versions of the DEFINE_GUID macro in guiddef.h (MyGuidDef.h): - if INITGUID is not defined: DEFINE_GUID declares an external reference to the symbol name. - if INITGUID is defined: DEFINE_GUID initializes the symbol name to the value of the GUID. Also we need IID_IUnknown that is initialized in some file for linking: MSVC: by default the linker uses some lib file that contains IID_IUnknown MinGW: add -luuid switch for linker WinCE: we define IID_IUnknown in this file Other: we define IID_IUnknown in this file */ #ifdef _WIN32 #ifdef UNDER_CE #include #endif #include #ifdef UNDER_CE DEFINE_GUID(IID_IUnknown, 0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46); #endif #else #define INITGUID #include "MyGuidDef.h" DEFINE_GUID(IID_IUnknown, 0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46); #endif #endif