[win] Impersonate anonymous token when closing Clipboard (fix #71) (#72)

dacap · Apr 22, 2024 · ab084ce · ab084ce
1 parent 42e0d7c
commit ab084ce
Showing 1 changed file with 17 additions and 1 deletion.
diff --git a/clip_win.cpp b/clip_win.cpp
@@ -53,6 +53,20 @@ class Hglobal {
   HGLOBAL m_handle;
 };
 
+class AnonymousTokenImpersonator {
+public:
+  AnonymousTokenImpersonator()
+    : must_revert(ImpersonateAnonymousToken(GetCurrentThread()))
+  {}
+
+  ~AnonymousTokenImpersonator() {
+    if (must_revert)
+      RevertToSelf();
+  }
+private:
+  const bool must_revert;
+};
+
 }
 
 lock::impl::impl(void* hwnd) : m_locked(false) {
@@ -72,8 +86,10 @@ lock::impl::impl(void* hwnd) : m_locked(false) {
 }
 
 lock::impl::~impl() {
-  if (m_locked)
+  if (m_locked) {
+    AnonymousTokenImpersonator guard{};
     CloseClipboard();
+  }
 }
 
 bool lock::impl::clear() {