videoio: plugins support on Win32

modules/core/include/opencv2/core/operations.hpp

@@ -52,7 +52,11 @@
 #include <cstdio>
 
 #if defined(__GNUC__) || defined(__clang__) // at least GCC 3.1+, clang 3.5+
-#  define CV_FORMAT_PRINTF(string_idx, first_to_check) __attribute__ ((format (printf, string_idx, first_to_check)))
+#  if defined(__MINGW_PRINTF_FORMAT)  // https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/.
+#    define CV_FORMAT_PRINTF(string_idx, first_to_check) __attribute__ ((format (__MINGW_PRINTF_FORMAT, string_idx, first_to_check)))
+#  else
+#    define CV_FORMAT_PRINTF(string_idx, first_to_check) __attribute__ ((format (printf, string_idx, first_to_check)))
+#  endif
 #else
 #  define CV_FORMAT_PRINTF(A, B)
 #endif

modules/core/include/opencv2/core/private.hpp

@@ -872,9 +872,17 @@ Passed subdirectories are used in LIFO order.
 */
 CV_EXPORTS void addDataSearchSubDirectory(const cv::String& subdir);
 
-/** @brief Return location of OpenCV libraries or current executable
+/** @brief Retrieve location of OpenCV libraries or current executable
  */
-CV_EXPORTS std::string getBinLocation();
+CV_EXPORTS bool getBinLocation(std::string& dst);
+
+#if defined(_WIN32)
+/** @brief Retrieve location of OpenCV libraries or current executable
+
+@note WIN32 only
+ */
+CV_EXPORTS bool getBinLocation(std::wstring& dst);
+#endif
 
 //! @}
 

modules/core/include/opencv2/core/utils/filesystem.hpp

@@ -28,6 +28,7 @@ CV_EXPORTS cv::String join(const cv::String& base, const cv::String& path);
 
 /** Get parent directory */
 CV_EXPORTS cv::String getParent(const cv::String &path);
+CV_EXPORTS std::wstring getParent(const std::wstring& path);
 
 /**
  * Generate a list of all files that match the globbing pattern.