Update C++ infer: search images on windows os

deploy/cpp/utils/utils.h

@@ -23,7 +23,8 @@
 #include <opencv2/highgui/highgui.hpp>
 
 #ifdef _WIN32
-#include <filesystem>
+#define GLOG_NO_ABBREVIATED_SEVERITIES
+#include <windows.h>
 #else
 #include <dirent.h>
 #include <sys/types.h>
@@ -67,15 +68,21 @@ namespace utils {
     // scan a directory and get all files with input extensions
     inline std::vector<std::string> get_directory_images(
                     const std::string& path, const std::string& exts) {
+        std::string pattern(path);
+        pattern.append("\\*");
         std::vector<std::string> imgs;
-        for (const auto& item :
-                    std::experimental::filesystem::directory_iterator(path)) {
-            auto suffix = item.path().extension().string();
-            if (exts.find(suffix) != std::string::npos && suffix.size() > 0) {
-                auto fullname = path_join(path,
-                                          item.path().filename().string());
-                imgs.push_back(item.path().string());
-            }
+        WIN32_FIND_DATA data;
+        HANDLE hFind;
+        if ((hFind = FindFirstFile(pattern.c_str(), &data)) != INVALID_HANDLE_VALUE) {
+            do {
+                auto fname = std::string(data.cFileName);
+                auto pos = fname.rfind(".");
+                auto ext = fname.substr(pos + 1);
+                if (ext.size() > 1 && exts.find(ext) != std::string::npos) {
+                    imgs.push_back(path + "\\" + data.cFileName);
+                }
+            } while (FindNextFile(hFind, &data) != 0);
+            FindClose(hFind);
         }
         return imgs;
     }