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I get linker errors about multiple or missing symbols for globally unique identifiers (GUIDs), what do I do?

April 26, 2017errors globally guids identifiers Linker MISSING Symbols

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I get linker errors about multiple or missing symbols for globally unique identifiers (GUIDs), what do I do?

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The various GUIDs you use should be defined once and only once. The definition for the GUID will be inserted if you #define the INITGUID symbol before including the DirectX header files. Therefore, you should make sure that this only occurs for one compilation unit. An alternative to this method is to link with the dxguid.lib library, which contains definitions for all of the DirectX GUIDs. If you use this method (which is recommended), then you should never #define the INITGUID symbol.