Backends: Win32: Convert WM_CHAR values with MultiByteToWideChar() when window class was registered as MBCS (not Unicode). (#5725, #1807, #471, #2815, #1060)

backends/imgui_impl_win32.cpp

@@ -34,6 +34,7 @@ typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2022-09-28: Inputs: Convert WM_CHAR values with MultiByteToWideChar() when window class was registered as MBCS (not Unicode).
 //  2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
 //  2021-01-20: Inputs: calling new io.AddKeyAnalogEvent() for gamepad support, instead of writing directly to io.NavInputs[].
@@ -613,9 +614,18 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
         io.AddFocusEvent(msg == WM_SETFOCUS);
         return 0;
     case WM_CHAR:
-        // You can also use ToAscii()+GetKeyboardState() to retrieve characters.
-        if (wParam > 0 && wParam < 0x10000)
-            io.AddInputCharacterUTF16((unsigned short)wParam);
+        if (::IsWindowUnicode(hwnd))
+        {
+            // You can also use ToAscii()+GetKeyboardState() to retrieve characters.
+            if (wParam > 0 && wParam < 0x10000)
+                io.AddInputCharacterUTF16((unsigned short)wParam);
+        }
+        else
+        {
+            wchar_t wch = 0;
+            ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, (char*)&wParam, 1, &wch, 1);
+            io.AddInputCharacter(wch);
+        }
         return 0;
     case WM_SETCURSOR:
         // This is required to restore cursor when transitioning from e.g resize borders to client area.

docs/CHANGELOG.txt

@@ -158,6 +158,8 @@ Other Changes:
 - Backends: GLFW: Honor GLFW_CURSOR_DISABLED by not setting mouse position. (#5625) [@scorpion-26]
 - Backends: SDL: Disable SDL 2.0.22 new "auto capture" which prevents drag and drop across windows
   (e.g. for multi-viewport support) and don't capture mouse when drag and dropping. (#5710)
+- Backends: Win32: Convert WM_CHAR values with MultiByteToWideChar() when window class was
+  registered as MBCS (not Unicode). (#5725, #1807, #471, #2815, #1060) [@or75, @ocornut]
 - Backends: Metal: Use __bridge for ARC based systems. (#5403) [@stack]
 - Backends: Metal: Add dispatch synchronization. (#5447) [@luigifcruz]
 - Backends: Metal: Update deprecated property 'sampleCount'->'rasterSampleCount'. (#5603) [@dcvz]