// OImage.h
OC_API LPVOID LoadMapTiles(LPCSTR lpcszUrl, double dMinLongitude, double dMaxLongitude,
        double dMinLatitude, double dMaxLatitude, unsigned int nZoomLevel,
        MapTilesOptions* lpOptions);

OC_API LPVOID LoadGoogleMapTiles(double dMinLongitude, double dMaxLongitude,
        double dMinLatitude, double dMaxLatitude, unsigned int nZoomLevel,
        LPCSTR key, string* pstrCopyright, LPCSTR request_header, LPCSTR request_data,
        bool bConvertToWGS84, LPCSTR session_token);