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Editorial Team
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Asked: 2026-06-10T05:51:40+00:00

Recently, I try to find out the source code of the calcOpticalFlowPyrLK function in

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Recently, I try to find out the source code of the “calcOpticalFlowPyrLK” function in OpenCV library. When I searched it’s definition, I found a macro named “CV_EXPORTS_W”. Anybody knows it’s meaning?

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  1. Editorial Team

    CV_EXPORTS_W is defined in modules/core/include/opencv2/core/types_c.h as an alias for CV_EXPORTS, and in the same file CV_EXPORTS is defined as:

    #if (defined WIN32 || defined _WIN32 || defined WINCE) && defined CVAPI_EXPORTS
# define CV_EXPORTS __declspec(dllexport)
#else
# define CV_EXPORTS
#endif

    In other words, it’s an alias for __declspec(dllexport) on a windows platform where CVAPI_EXPORTS is defined, otherwise it’s empty.

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