MFC切换输入法（c++ 对指定的窗口使用指定的输入法）

::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, 0, (LPARAM)0x04090409);


	//::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, 0, (LPARAM)0x04090409);

	//::SendMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, true, 0x08040804);
	//::SendMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, true, 0x04090409);

	//::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, (WPARAM)TRUE, (LPARAM)0x0409);

	//0x04090409 英语(美国) 美式键盘
	//0x08040804 ; 中文(中国) 简体中文-美式键盘
	//#DeFine WM_INPUTLANGCHANGEREQUEST 0x50当用户选择某种输入语言，或输入语言的热键改变
	
	//模拟发送按下'CTRL+SPACE'键的消息，切换到英文输入法
	/*keybd_event(17, 0, 0, 0);
	keybd_event(32, 0, 0, 0);
	keybd_event(17, 0, KEYEVENTF_KEYUP, 0);
	keybd_event(32, 0, KEYEVENTF_KEYUP, 0);*/

	// See MSDN LoadKeyboardLayout():
    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms646305(v=vs.85).aspx
	//调用API函数 LoadKeyboardLayout 把指定的输入法激活，该函数返回指定输入法的键盘布局句柄
	HKL keyboard = LoadKeyboardLayout(_T("00000409"), KLF_ACTIVATE);
	::ActivateKeyboardLayout(keyboard, 0);

	DWORD dwNewKeybLayout = 0x00000409; // Layout must be already loaded!
	//向当前的活动窗口发送切换输入法的消 息，DllCall("SendMessage", UInt, 活动窗口的句柄, UInt, 80, UInt, 1, UInt, 输入法键盘布局句柄) 。这样就完成了调用指定的输入法
	::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, 0, (LPARAM)dwNewKeybLayout);
	::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGE, 0, (LPARAM)dwNewKeybLayout);

LoadKeyboardLayout("00000409", KLF_ACTIVATE);
	DWORD dwNewKeybLayout = 0x00000409; // Layout must be already loaded!
	::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGEREQUEST, 0, (LPARAM)dwNewKeybLayout);
	::PostMessage(AfxGetMainFrame()->GetSafeHwnd(), WM_INPUTLANGCHANGE, 0, (LPARAM)dwNewKeybLayout);

_dword System::GetKeyboardLanguage( )
{
	return GetLanguageID( (_dword) ::GetKeyboardLayout( 0 ) & 0x0000FFFF );
}

_bool System::SetKeyboardLanguage( _dword langid )
{
	StringPtr langname = L"00000409";

	switch ( langid )
	{
		case Language::LANGUAGE_ZH_CN:	langname = L"00000804"; break;
		case Language::LANGUAGE_ZH_TW:	langname = L"00000404"; break;
		case Language::LANGUAGE_DE_DE:	langname = L"00000407"; break;
		case Language::LANGUAGE_FR_FR:	langname = L"0000040C"; break;
		case Language::LANGUAGE_ES_ES:	langname = L"0000040A"; break;
		case Language::LANGUAGE_TR_TR:	langname = L"0000041F"; break;
	}

	HKL keyboard = ::LoadKeyboardLayout( langname, KLF_ACTIVATE );
	if ( keyboard == _null )
		return _false;

	::ActivateKeyboardLayout( keyboard, 0 );

	return _true;
}

Gui, Add, GroupBox, x6 y4 w230 h10 , 已安装的输入法(双击切换)
Gui, Add, ListView, r20 x6 y24 w230 h120 vListIME gSetIME ,序号|键盘布局|名称
Gui, Add, Button, x6 y144 w80 h30 gPreIME, 上一输入法
Gui, Add, Button, x156 y144 w80 h30 gNextIME, 下一输入法
Gui, Add, Button, x86 y144 w70 h30 gStateIME, 当前状态
; Generated using SmartGUI Creator 4.0
Gui, Show, x397 y213 h190 w247,输入法切换
Gosub,ReadIME
Return
GuiClose:
ExitApp
ReadIME:
LV_ModifyCol(3,300)
Loop,HKEY_USERS,.DEFAULT/Keyboard Layout/Preload, 1, 1
{
    RegRead,Layout
    RegRead,IMEName,HKEY_LOCAL_MACHINE,SYSTEM/CurrentControlSet/Control/Keyboard Layouts/%Layout%,Layout Text
    RegRead,Layout
     ListContent=%A_LoopRegName%丨%IMEName%丨 %Layout%
    LV_Insert(1,"Vis",A_LoopRegName,Layout,IMEName)
}
Return
StateIME:
Result:=DllCall("GetKeyboardLayout","int",0,UInt)
SetFormat, integer, hex
Result += 0
SetFormat, integer, D
MsgBox 当前键盘布局为 %Result%
return

SetIME:
If (A_GuiEvent<>"DoubleClick")
{
    Return
}
Gui,Submit,Nohide
LV_GetText(Layout,A_EventInfo,2)
;~ MsgBox %Layout%

SwitchIME(Layout)
Return

SwitchIME(dwLayout)
{
    DllCall("SendMessage", UInt, WinActive("A"), UInt, 80, UInt, 1, UInt, DllCall("LoadKeyboardLayout", Str, dwLayout, UInt, 1))
}

NextIME:
DllCall("SendMessage", UInt, WinActive("A"), UInt, 80, UInt, 1, UInt, DllCall("ActivateKeyboardLayout", UInt, 1, UInt, 256))
;-- 对当前窗口激活下一输入法
Return
PreIME:
DllCall("SendMessage", UInt, WinActive("A"), UInt, 80, UInt, 1, UInt, DllCall("ActivateKeyboardLayout", UInt, 0, UInt, 256))
;-- 对当前窗口激活上一输入法
Return

WM_INPUTLANGCHANGE：当窗口接收到WM_INPUTLANGCHANGE消息时，表示输入法发生了改变。
LoadKeyboardLayout:该函数给系统中装入一种新的键盘布局，可以同时装入几种不同的键盘布局，任一时刻仅有一个进程是活动的，装入多个键盘布局使得在多种布局间快速切换。
pwszKLID：缓冲区中的存放装入的键盘布局名称，名称是由语言标识符（低位字）和设备标识符（高位字）组成的十六进制值串，例如 U.S.英语对应的语言标识符为DX0409，则基本的U.S.英语键盘布局命名为“0000409”。U.S.英语键盘布局的变种（例如Dvorak布局）命名为“00010409”，“00020409”等。
　　Flags：指定如何装入键盘布局，该参数可以是如下的值。
　　KLF_ACTIVATE：若指定布局尚未装入，该函数为当前线程装入并激活它。

 LoadKeyboardLayout("00000409", KLF_ACTIVATE);

DWORD dwNewKeybLayout = 0x00000409; // Layout must be already loaded!
PostMessage(hWnd, WM_INPUTLANGCHANGEREQUEST, 0, (LPARAM)dwNewKeybLayout);
PostMessage(hWnd, WM_INPUTLANGCHANGE, 0, (LPARAM)dwNewKeybLayout);