filemanager.cpp: use non-deprecated SHGetKnownFolderPath() function t…

…o get the user writable directory on Windows (#2246)

Fixes #2245

src/filemanager.cpp

@@ -1203,12 +1203,21 @@ const char *proj_context_get_user_writable_directory(PJ_CONTEXT *ctx,
     if (ctx->user_writable_directory.empty()) {
         std::string path;
 #ifdef _WIN32
+#ifdef __MINGW32__
         std::wstring wPath;
         wPath.resize(MAX_PATH);
         if (SHGetFolderPathW(nullptr, CSIDL_LOCAL_APPDATA, nullptr, 0,
                              &wPath[0]) == S_OK) {
             wPath.resize(wcslen(wPath.data()));
             path = NS_PROJ::WStringToUTF8(wPath);
+#else
+        wchar_t* wPath;
+        if (SHGetKnownFolderPath(FOLDERID_LocalAppData, 0, nullptr, &wPath) == S_OK){
+            std::wstring ws(wPath);
+            std::string str = NS_PROJ::WStringToUTF8(ws);
+            path = str;
+            CoTaskMemFree(wPath);
+#endif
         } else {
             const char *local_app_data = getenv("LOCALAPPDATA");
             if (!local_app_data) {