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c++实现输入法窗口自定义的代码

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#pragma once

#include <Windows.h>
#include <imm.h>

#include <string>

#pragma comment ( lib , "imm32.lib" )

//字符串临时缓存长度
#ifndef _MAX_BUF_
#define _MAX_BUF_ 256
#endif

/*
功能：取输入法窗口候选字列表，输入法名称及状态
为自己绘制“输入法窗口”创造必要条件。
标题：实现输入法窗口自定义
关键词：IME VC 输入法 输入法窗口
最后修改日期：2010-09-02
Remark:当前环境VS2008+SP1 WinXPSP3。编译选项为Unicode。
http://dev.gameres.com/Program/Control/ime.htm
CGetIme为单实例类
测试：在Irrlicht1.7.1中测试通过。
在标准Win32窗口程序中测试通过。
*/
class CGetIme
{
public:
CGetIme(void)
{
m_hWnd = NULL ;
}
~CGetIme();

//功能：初始化当前类的实例，使之可用。
//Remark:你只能在hWnd的属主（线程）中调用这个函数
//建议在WM_CREATE或WM_IME_SETCONTEXT中调用
void setHWnd(HWND hWnd);

//功能：取候选字列表，和当前输入的候选key
//Remark:建议在WM_IME_NOTIFY的wParam为以下
//IMN_OPENCANDIDATE和IMN_CHANGECANDIDATE事件
//时调用
//strCS=>已经键入的Key,strCL=>候选字列表
void getCandidateList(std::string &strCS,std::string &strCL);

//功能：取输入法名称
std::string getDescription();

//功能：取输入法状态
std::string getConversion();

//Remark:建议在IMN_CLOSECANDIDATE事件时，关掉对“自定义输入法窗口”的绘制。

//Remark:WM_IME_CHAR事件中，你会得到，转换后的字符串，
//不过你是一个wchar_t一个wchar_t的得到，参考下面的代码段
//char bits [2] = { (char) ((wParam & 0xff00)>> 8), (char) (wParam & 0xff) },wchar_t t = bits;

//禁止输入法
void disableIME();
//允许输入法
void enableIME();
protected:
HWND m_hWnd;
HIMC m_hIMC;

std::string m_candidate; //候选字列表
std::string m_description; //输入法名称
std::string m_conversion; //输入法状态
std::string m_compstr; //已经键入的key
};

//=======================================================

#include "StdAfx.h"
#include "GetIme.h"

#include <assert.h>

#include "../T3D3_Irrlicht161/Utils.h"

void CGetIme::setHWnd(HWND hWnd)
{
m_hWnd = hWnd;

//ImmGetContext cannot get input context of other process. ImmGetContext internally
//checks whether the process of the target window is the current process.
//If the check fails, the function returns NULL.
m_hIMC = ::ImmGetContext(m_hWnd);
assert(m_hIMC);

//Below,Hide IME window
HWND hWndIME = ::ImmGetDefaultIMEWnd(hWnd);
if (hWndIME)
::ShowWindow(hWndIME,SW_HIDE);
}

CGetIme::~CGetIme()
{
//Show IME window
HWND hWndIME = ::ImmGetDefaultIMEWnd(m_hWnd);
if (hWndIME)
::ShowWindow(hWndIME,SW_SHOW);

ImmReleaseContext(m_hWnd, m_hIMC);
}

void CGetIme::getCandidateList(std::string &strCS,std::string &strCL)
{
std::string sR("");
wchar_t buf[32];
char *p;
int nR;
DWORD dwSize;
LPCANDIDATELIST lp;

m_candidate = "";
m_compstr = "";

HKL hKL = ::GetKeyboardLayout(0);//获得键盘布局
if (hKL==0)
{
OutputDebugString(L"hKL==0/n");
return ;
}

if( m_hIMC == NULL)
{
OutputDebugString(L"hIMC ==0/n");
return ;
}

ZeroMemory(buf,sizeof(buf));

ImmGetCompositionString(m_hIMC, GCS_COMPSTR, buf, 20);
std::wstring wsB=buf;
strCS = ws2s(wsB);
m_compstr = strCS;

dwSize = ImmGetCandidateList(m_hIMC, 0, NULL, 0);

if (dwSize>0)
{
p=new char[dwSize];
lp = (LPCANDIDATELIST)p;

nR = ImmGetCandidateList(m_hIMC, 0, lp, dwSize);
//若是取其它窗口的IMM状态，则lp->dwStyle的值为零(Unknown)。
//否则返回一，表示可以读取lp指向的数据结构！

if (nR && lp->dwCount>1)
{
int i=1;
strCL = "";
char temp[_MAX_BUF_];
ZeroMemory(temp,sizeof(temp));

int nOffset;

while ( (i<lp->dwCount-lp->dwSelection+1) &&
(i<lp->dwPageSize+1) )
{
std::wstring sT= (wchar_t *)(p + lp->dwOffset[lp->dwPageStart+(i-1)]);
sprintf( temp , " %d." , i);

strCL = strCL + temp;
strCL = strCL + "" + ws2s(sT);
i++;
}
if (strCL.find_first_not_of(' ') != -1)
{
strCL =strCL.substr(strCL.find_first_not_of(' '),strCL.length());
//例如“万能五笔输入法中”状态中输入字符"k"，strCL变为下值
//1.中 2.口 3.员工maa 4.哎呀aka 5.只w 6.员m
}
}

delete p;
}
else
{
OutputDebugString(L"Error: dwSize = ImmGetCandidateList(hIMC, 0, NULL, 0);<= 0 /n");
}
m_candidate = strCL;
}

//取输入法名称
std::string CGetIme::getDescription()
{
std::string sR("");

m_description = "";

HKL hKL = ::GetKeyboardLayout(0);//获得键盘布局
if (hKL==0)
return sR;

int iSize = ::ImmGetDescription(hKL, NULL, 0);//获得输入法名称大小

if (iSize>=_MAX_BUF_)
{
OutputDebugString(L"CShowIMEUI::getDescription iSize>=MAX_BUF_SIZE CallError/n");
return sR;
}

if (iSize==0)
{
//如果名称大小为0则不显示输入法状态
OutputDebugString(L"CShowIMEUI::getDescription iSize==0 CallError/n");
return sR;
}

wchar_t name[_MAX_BUF_];
::ImmGetDescription(hKL,name, _MAX_BUF_ );//获得输入法名称
std::wstring wsName = name;
sR = ws2s(wsName);

m_description = sR;

return sR;
}

//取输入法状态
std::string CGetIme::getConversion()
{
DWORD dwConversion;
DWORD dwSentence;
LPDWORD lpfdwConversion = &dwConversion;
LPDWORD lpfdwSentence = &dwSentence;
std::string conversion;

m_conversion = "";
if (m_hIMC==NULL)
{
return "";
}

BOOL ret = ::ImmGetConversionStatus(m_hIMC, lpfdwConversion, lpfdwSentence);
::ImmReleaseContext(m_hWnd,m_hIMC);
char pOutputBuf[_MAX_BUF_];
memset(pOutputBuf,0,_MAX_BUF_);

if (*lpfdwConversion & 0x01) strcat(pOutputBuf, " 中文");
else strcat(pOutputBuf, " 英文");
if (*lpfdwConversion & 0x08) strcat(pOutputBuf, " 全角");
else strcat(pOutputBuf, " 半角");
if (*lpfdwConversion & 0x400) strcat(pOutputBuf, " 中文标点");
else strcat(pOutputBuf, " 英文标点");
if (*lpfdwConversion & 0x80) strcat(pOutputBuf, " 软键盘");
else
conversion = "";

conversion = pOutputBuf;

m_conversion = conversion;

return conversion;
}

void CGetIme::disableIME()
{
m_hIMC = ImmAssociateContext(m_hWnd, NULL);

// It makes IME disable for hWnd window.
// Then you can do whatever you want without IME.

//如果是MFC程序~~~~ 最好在 InitInstance() 下加一句~~
//ImmDisableIME(GetCurrentThreadId());
}

void CGetIme::enableIME()
{
ImmAssociateContext(m_hWnd, m_hIMC);

// If you want to enable IME again,
// then you can use the previous stored IME
// context(hIMC) to restore IME.
}