E2498 Need previously defined struct GUID (C++)
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This happens when you use the __uuidof operator without including a header that defines the GUID struct. So the following program code would display this error:
class __declspec(uuid("19a76fe0-7494-11d0-8816-00a0c903b83c")) foo{}; int main() { __uuidof(foo); return 0; }
And you would fix it as follows:
#include <windows.h> // Will pull in struct GUID class __declspec(uuid("19a76fe0-7494-11d0-8816-00a0c903b83c")) foo{}; int main() { __uuidof(foo); return 0; }