diff --git a/device/win_usb/win_usb.cpp b/device/win_usb/win_usb.cpp
index a27e1a0..5f03f8f 100644
--- a/device/win_usb/win_usb.cpp
+++ b/device/win_usb/win_usb.cpp
@@ -1205,6 +1205,12 @@ void usb_monitor::quit(void)
 {
     KillTimer(wnd_monitor_, usb_monitor::find_usb_timer_);
     run_ = false;
+    if (IsWindow(wnd_monitor_))
+    {
+        PostMessage(wnd_monitor_, WM_QUIT, 0, 0);
+        Sleep(100);
+    }
+
     if (handle_msg_.get())
     {
         PostThreadMessageW(handle_msg_id_, WM_QUIT, 0, 0);
@@ -1213,11 +1219,6 @@ void usb_monitor::quit(void)
         handle_msg_.reset();
     }
 
-    if (IsWindow(wnd_monitor_))
-    {
-        PostMessage(wnd_monitor_, WM_QUIT, 0, 0);
-    }
-
     {
         std::lock_guard<std::mutex> lock(lock_);
         for (auto& v : devices_)
diff --git a/lang/dllmain.cpp b/lang/dllmain.cpp
index daed8c8..3ce9c7f 100644
--- a/lang/dllmain.cpp
+++ b/lang/dllmain.cpp
@@ -1,6 +1,8 @@
 // dllmain.cpp : 定义 DLL 应用程序的入口点。
 #include "pch.h"
 
+extern void clear_language_data(void);
+
 BOOL APIENTRY DllMain( HMODULE hModule,
                        DWORD  ul_reason_for_call,
                        LPVOID lpReserved
@@ -11,7 +13,9 @@ BOOL APIENTRY DllMain( HMODULE hModule,
     case DLL_PROCESS_ATTACH:
     case DLL_THREAD_ATTACH:
     case DLL_THREAD_DETACH:
+        break;
     case DLL_PROCESS_DETACH:
+        clear_language_data();
         break;
     }
     return TRUE;