diff --git a/src/Key/KeyEventSink.cpp b/src/Key/KeyEventSink.cpp
index 1099f053..aed2489c 100644
--- a/src/Key/KeyEventSink.cpp
+++ b/src/Key/KeyEventSink.cpp
@@ -1,3 +1,4 @@
+#include "FanyUtils.h"
 #include "Private.h"
 #include "Globals.h"
 #include "SampleIME.h"
@@ -8,6 +9,9 @@
 #include "SampleIMEBaseStructure.h"
 #include "fmt/format.h"
 #include "fmt/xchar.h"
+#include <atlbase.h>
+#include <string>
+#include <boost/lexical_cast.hpp>
 
 // 0xF003, 0xF004 are the keys that the touch keyboard sends for next/previous
 #define THIRDPARTY_NEXTPAGE static_cast<WORD>(0xF003)
@@ -345,6 +349,24 @@ STDAPI CSampleIME::OnKeyDown(ITfContext *pContext, WPARAM wParam, LPARAM lParam,
 
         if (needInvokeKeyHandler)
         {
+            TF_STATUS tfStatus;
+            if (SUCCEEDED(pContext->GetStatus(&tfStatus)))
+            {
+                if (tfStatus.dwDynamicFlags & TF_SD_READONLY)
+                {
+                    FanyUtuils::SendKeys(boost::lexical_cast<std::wstring>(wch));
+#ifdef FANY_DEBUG
+                    Global::LogMessageW(L"pContext is read-only");
+#endif
+                }
+                else
+                {
+#ifdef FANY_DEBUG
+                    Global::LogMessageW(L"pContext is editable");
+#endif
+                }
+            }
+
             _InvokeKeyHandler(pContext, code, wch, (DWORD)lParam, KeystrokeState);
         }
     }
diff --git a/src/Key/KeyHandler.cpp b/src/Key/KeyHandler.cpp
index 51bcb31f..24975b84 100644
--- a/src/Key/KeyHandler.cpp
+++ b/src/Key/KeyHandler.cpp
@@ -7,6 +7,8 @@
 #include "SampleIMEBaseStructure.h"
 #include <string>
 #include "Utils/FanyUtils.h"
+#include "fmt/format.h"
+#include "fmt/xchar.h"
 
 //////////////////////////////////////////////////////////////////////
 //
@@ -661,8 +663,10 @@ HRESULT CSampleIME::_InvokeKeyHandler(_In_ ITfContext *pContext, UINT code, WCHA
 
     // we'll insert a char ourselves in place of this keystroke
     pEditSession = new (std::nothrow) CKeyHandlerEditSession(this, pContext, code, wch, keyState);
+    Global::LogMessageW(L"fanyfull01 _InvokeKeyHandler");
     if (pEditSession == nullptr)
     {
+        Global::LogMessageW(L"fanyfull02 _InvokeKeyHandler");
         goto Exit;
     }
 
@@ -672,6 +676,12 @@ HRESULT CSampleIME::_InvokeKeyHandler(_In_ ITfContext *pContext, UINT code, WCHA
     // Do not specify TF_ES_SYNC so edit session is not invoked on WinWord
     //
     hr = pContext->RequestEditSession(_tfClientId, pEditSession, TF_ES_ASYNCDONTCARE | TF_ES_READWRITE, &hr);
+    if (FAILED(hr))
+    {
+        Global::LogMessageW(L"fanyfull03 _InvokeKeyHandler");
+    }
+
+    Global::LogMessageW(fmt::format(L"fanyfull04 _InvokeKeyHandler hr: {}", hr).c_str());
 
     pEditSession->Release();