diff --git a/src/core/win_hotkey.cpp b/src/core/win_hotkey.cpp
index c10d952..48d9354 100644
--- a/src/core/win_hotkey.cpp
+++ b/src/core/win_hotkey.cpp
@@ -5,6 +5,14 @@
 #include <windows.h>
 #include <QAbstractNativeEventFilter>
 #include <QGuiApplication>
+#include <QThread>
+#include <QMetaObject>
+#include <QWindow>
+
+// MOD_NOREPEAT 在 MinGW 7.3.0 的 Windows SDK 中未定义（Windows 8+ 引入）
+#ifndef MOD_NOREPEAT
+#define MOD_NOREPEAT 0x4000
+#endif
 #endif
 
 static const char* const kTag = "CapsLockVoiceHotkey";
@@ -32,7 +40,7 @@ public:
         : hotkey_(hotkey) {}
 
     bool nativeEventFilter(const QByteArray& eventType, void* message,
-                           qintptr* /*result*/) override {
+                           long* /*result*/) override {
         if (eventType == "windows_generic_MSG" || eventType == "windows_dispatcher_MSG") {
             auto* msg = static_cast<MSG*>(message);
             if (msg->message == WM_HOTKEY) {
@@ -63,9 +71,12 @@ bool CapsLockVoiceHotkey::start() {
     if (active_) return true;
 
 #ifdef Q_OS_WIN
-    HWND hwnd = reinterpret_cast<HWND>(QGuiApplication::instance()->winId());
+    HWND hwnd = nullptr;
+    QWindow* window = QGuiApplication::topLevelWindows().value(0, nullptr);
+    if (window) {
+        hwnd = reinterpret_cast<HWND>(window->winId());
+    }
     if (!hwnd) {
-        // Try to get the top-level widget's window handle
         hwnd = GetForegroundWindow();
     }
 
@@ -77,7 +88,7 @@ bool CapsLockVoiceHotkey::start() {
     // 注册 CapsLock (VK_CAPITAL = 0x14) 全局快捷键
     // MOD_NOREPEAT 防止按住时重复触发
     const int vkCapsLock = 0x14;
-    impl_->hotkeyId = GlobalAddAtom(L"ImpressVoiceHotkey");
+    impl_->hotkeyId = GlobalAddAtomW(L"ImpressVoiceHotkey");
 
     BOOL ok = RegisterHotKey(hwnd, impl_->hotkeyId, MOD_NOREPEAT, vkCapsLock);
     if (!ok) {
@@ -146,7 +157,14 @@ void CapsLockVoiceHotkey::stop() {
     }
 
     // 注销快捷键
-    HWND hwnd = reinterpret_cast<HWND>(QGuiApplication::instance()->winId());
+    HWND hwnd = nullptr;
+    QWindow* stopWindow = QGuiApplication::topLevelWindows().value(0, nullptr);
+    if (stopWindow) {
+        hwnd = reinterpret_cast<HWND>(stopWindow->winId());
+    }
+    if (!hwnd) {
+        hwnd = GetForegroundWindow();
+    }
     if (hwnd && impl_->hotkeyId) {
         UnregisterHotKey(hwnd, impl_->hotkeyId);
         GlobalDeleteAtom(impl_->hotkeyId);