找出当键盘布局发生变化 [英] Find out when keyboard layout is changed

问题描述

我写的屏幕键盘，并想尽快的键盘布局改变重绘我的布局。

I am writing an onscreen keyboard and would like to redraw my layout as soon as keyboard layout is changed.

目前我呼吁：

GetKeyboardLayout(GetWindowThreadProcessId(GetForegroundWindow(), NULL));

在每一个关键的preSS，以找出是否布局发生了变化。如果用户更改鼠标的布局实在不行，直到关键是pressed。

on every key press to find out if the layout has changed. It does not work if user changes the layout by mouse, until key is pressed.

我想知道是否有什么办法得到通知 当电流前景窗口的键盘布局发生变化， 这样我就可以尽快重绘我的布局发生变化时。

I would like to know if there is any way to get notified when the keyboard layout of the current foreground window is changed, so I can redraw my layout as soon as the change happens.

推荐答案

有一种方法... 的

There is a way ...

首先，您需要注册您的应用程序捕获前台窗口的变化：
使用<一个href="http://msdn.microsoft.com/library/windows/desktop/dd373640.aspx"><$c$c>SetWinEventHook与 EVENT_SYSTEM_FOREGROUND 的（和 WINEVENT_OUTOFCONTEXT ，因为它是.NET）的为。

First you need to register your application to capture foreground window changes:
Use SetWinEventHook with EVENT_SYSTEM_FOREGROUND (and WINEVENT_OUTOFCONTEXT as it's .NET) for that.

如果出现这种情况：使用你的 GetKeyboardLayout 解决方案获得该窗口的当前布局

If that happens: Use your GetKeyboardLayout solution for getting the current layout of that window.

然后使用本地的的的Windows挂钩的 （你可能会使用它的低级别，全球范围内为重点捕获）的与 WH_CALLWNDPROC 和新的前台窗口的线程。
听<一个href="http://msdn.microsoft.com/library/windows/desktop/ms632629.aspx"><$c$c>WM_INPUTLANGCHANGE消息该窗口接收更改布局。
（您可能需要另一种前景更改后解开/ rehook）的

Then use a local Windows Hook (you're probably using it low-level-globally for key captures) with WH_CALLWNDPROC and the thread of the new foreground window.
Listen to WM_INPUTLANGCHANGE messages to that window to receive changes to the layout.
(You may want to unhook/rehook after another foreground change)

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