From 48e655706da2afca071baae10ac01a01a6de2642 Mon Sep 17 00:00:00 2001
From: ulhc <350246356@qq.com>
Date: Fri, 28 Nov 2025 23:05:45 +0800
Subject: [PATCH] Add support for WM_IME_CHAR in Win32 backend

Handle WM_IME_CHAR message for input character processing.
---
 backends/imgui_impl_win32.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/backends/imgui_impl_win32.cpp b/backends/imgui_impl_win32.cpp
index 73ff34b41..e7d93554d 100644
--- a/backends/imgui_impl_win32.cpp
+++ b/backends/imgui_impl_win32.cpp
@@ -879,6 +879,21 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandlerEx(HWND hwnd, UINT msg, WPA
     case WM_INPUTLANGCHANGE:
         ImGui_ImplWin32_UpdateKeyboardCodePage(io);
         return 0;
+    case WM_IME_CHAR :
+        if (::IsWindowUnicode(hwnd) == FALSE)
+        {
+            unsigned short ch = (unsigned short)wParam;
+            if (::IsDBCSLeadByte(HIBYTE(wParam)))
+            {
+                ch = MAKEWORD(HIBYTE(wParam), LOBYTE(wParam));
+            }
+
+            wchar_t wch = 0;
+            ::MultiByteToWideChar(bd->KeyboardCodePage, MB_PRECOMPOSED, (char*)&ch, sizeof(ch), &wch, 1);
+            io.AddInputCharacterUTF16(wch);
+            return 1;
+        }
+        return 0;
     case WM_CHAR:
         if (::IsWindowUnicode(hwnd))
         {