From 7d1d9133ffefd3caac36bb6fc4050d575928cfaf Mon Sep 17 00:00:00 2001
From: Gilgamesh Athoraya <e9gille@gmail.com>
Date: Mon, 1 Apr 2019 20:44:38 +0200
Subject: [PATCH] dont switch ime if not installed, fix #515

---
 windows-ime/set-ime.cs  |  19 +++++++++++++++++--
 windows-ime/set-ime.exe | Bin 6656 -> 6656 bytes
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/windows-ime/set-ime.cs b/windows-ime/set-ime.cs
index f20fd6a6..b6ecd751 100644
--- a/windows-ime/set-ime.cs
+++ b/windows-ime/set-ime.cs
@@ -13,6 +13,7 @@ class C {
   const uint WM_INPUTLANGCHANGEREQUEST = 0x0050;
   const int  KLF_ACTIVATE = 1;
 
+  [DllImport("user32.dll")] static extern uint GetKeyboardLayoutList(int nBuff, [Out] IntPtr [] lpList);
   [DllImport("user32.dll")] static extern bool GetKeyboardLayoutName(StringBuilder pwszKLID);
   [DllImport("user32.dll")] static extern IntPtr GetForegroundWindow();
   [DllImport("user32.dll")] static extern bool PostMessage(IntPtr hhwnd, uint msg, IntPtr wparam, IntPtr lparam);
@@ -51,13 +52,27 @@ public static Process Parent(Process process) {
     return FindPidFromIndexedProcessName(FindIndexedProcessName(process.Id));
   }
 
+  public static bool IsLayoutAvailable(string layoutId) {
+    uint nElements = GetKeyboardLayoutList(0, null);
+    IntPtr[] ids = new IntPtr[nElements];
+    GetKeyboardLayoutList(ids.Length, ids);
+    for (var index = 0; index < ids.Length; index++) {
+      if (ids[index].ToString("X16").Substring(8).Equals(layoutId)) return true;
+    }
+    return false;
+  }
+
   static int Main(string[] args) {
     if (args.Length != 1) { Console.WriteLine("usage: set-ime PID"); return 1; }
     int pid = int.Parse(args[0]);
     var w = getWindowByPID(pid);
     if (w == IntPtr.Zero) { w = getWindowByPID(Parent(Process.GetProcessById(pid)).Id); }
-    var lc = new StringBuilder(); GetKeyboardLayoutName(lc); lc[0] = 'E'; lc[1] = '0'; lc[2] = '9'; lc[3] = '9';
-    PostMessage(w, WM_INPUTLANGCHANGEREQUEST, IntPtr.Zero, LoadKeyboardLayout(lc.ToString(), KLF_ACTIVATE));
+    var lc = new StringBuilder();
+    GetKeyboardLayoutName(lc);
+    lc[0] = 'E'; lc[1] = '0'; lc[2] = '9'; lc[3] = '9';
+    string apl_ime = lc.ToString();
+    if (IsLayoutAvailable(apl_ime))
+      PostMessage(w, WM_INPUTLANGCHANGEREQUEST, IntPtr.Zero, LoadKeyboardLayout(apl_ime, KLF_ACTIVATE));
     return 0;
   }
 }
diff --git a/windows-ime/set-ime.exe b/windows-ime/set-ime.exe
index c222e956b811daf67b45b50b16bcab2f87d23a64..c6712e816eee89146e826bc92031d75b4703d7bb 100644
GIT binary patch
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