ShellExt: Option for separate instance (DLL)

MediaArea · Jan 15, 2025 · abe1bf0 · abe1bf0
1 parent 95a5818
commit abe1bf0
Showing 1 changed file with 57 additions and 1 deletion.
diff --git a/Source/WindowsShellExtension/dllmain.cpp b/Source/WindowsShellExtension/dllmain.cpp
@@ -552,8 +552,64 @@ struct ExplorerCommandHandler : public winrt::implements<ExplorerCommandHandler,
         module_path = module_path.remove_filename();
         module_path /= exe_filename;
 
+        // Option for separate instance
+        bool separate_instance{ false };
+        try {
+#ifdef MEDIAINFO_QT
+            if (RegGetBool(HKEY_CURRENT_USER, L"Software\\MediaArea.net\\MediaInfo", L"shellExtension_separateInstance"))
+#else
+            if (RegGetDword(HKEY_CURRENT_USER, L"Software\\MediaArea\\MediaInfo", L"ShellExtension_SeparateInstance"))
+#endif // MEDIAINFO_QT
+            {
+                separate_instance = true;
+            }
+        }
+        catch (...) {
+            // Error reading reg, default same instance
+        }
+        if (separate_instance) {
+            // Invoke application, one instance per item
+            for (DWORD i = 0; i < count; ++i) {
+                winrt::com_ptr<IShellItem> item;
+                auto result = items->GetItemAt(i, item.put());
+                if (SUCCEEDED(result)) {
+                    wil::unique_cotaskmem_string path;
+                    result = item->GetDisplayName(SIGDN_FILESYSPATH, &path);
+                    if (SUCCEEDED(result)) {
+                        std::filesystem::path filepath{ path.get() };
+                        // Resolve shortcuts
+                        if (filepath.extension().string().compare(".url") == 0) {
+                            std::string url;
+                            if (ExtractUrlFromShortcut(filepath, url))
+                                filepath = url;
+                        }
+                        if (filepath.extension().string().compare(".lnk") == 0) {
+                            WCHAR target_path[MAX_PATH];
+                            if (SUCCEEDED(ResolveIt(nullptr, filepath.wstring().c_str(), target_path, sizeof(target_path))))
+                                filepath = target_path;
+                        }
+                        auto command{ wil::str_printf<std::wstring>(LR"-("%s" %s)-", module_path.c_str(), QuoteForCommandLineArg(filepath.wstring()).c_str()) };
+                        wil::unique_process_information process_info;
+                        STARTUPINFOW startup_info = { sizeof(startup_info) };
+                        RETURN_IF_WIN32_BOOL_FALSE(CreateProcessW(
+                            nullptr,
+                            command.data(),
+                            nullptr /* lpProcessAttributes */,
+                            nullptr /* lpThreadAttributes */,
+                            false /* bInheritHandles */,
+                            CREATE_NO_WINDOW,
+                            nullptr,
+                            nullptr,
+                            &startup_info,
+                            &process_info));
+                    }
+                }
+            }
+            return S_OK;
+        }
+
         // Prepare cmd line string to invoke application ("path\to\application.exe" "path\to\firstitem" "path\to\nextitem" ...)
-        auto command = wil::str_printf<std::wstring>(LR"-("%s")-", module_path.c_str()); // Path to application.exe
+        auto command{ wil::str_printf<std::wstring>(LR"-("%s")-", module_path.c_str()) }; // Path to application.exe
         // Add multiple selected files/folders to cmd line as parameters
         for (DWORD i = 0; i < count; ++i) {
             winrt::com_ptr<IShellItem> item;