Direct3d 实现输入法

//******************************************************************//
//
// 做这个东西的时候得到了论坛上网友的热心帮助，整理之后再送给大家
// 这是个在DX程序下使用系统输入法的解决方案，可能有little bug :-)
// 不过还没发现，如果发现了，告诉我啊 [e-mail]
// 程序中使用的CHK()CHKB()是为了监测内存泄漏，可以去掉，CTTFFONT
// 为显示信息用，可以用其他方法替换如 TxtOut() 等
//
//******************************************************************//

//////////////////////////////////////////////////////////////////////
//
// IM.h: CIM class (使用系统)输入法类
// 2001/4/30 Write by Jerry Wang
// 感谢大大鱼的帮助
// Need Lib: imm32.lib
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_IM_H__6887B165_972D_4D17_8A75_FE07930CE59C__INCLUDED_)
#define AFX_IM_H__6887B165_972D_4D17_8A75_FE07930CE59C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#define _CIM_MAXINPUTCHARNUMBER 24 //最多输入的字节数

#include "FindMe.h"

class CIM
{
private:
    CTTFFont ttffont;                    //显示信息
    LPCANDIDATELIST m_lpCandList;        //输入法候选文字列表
    LPSTR m_lpszImeInput;                //指向IME输入的文字字符串指针
    LPSTR m_lpszCurInputLanguageDesc;    //指向当前输入语言描述的指针
    char m_cCandidateList[255];          //候选文字列表缓冲区
    char m_cInput[64];                   //输入的字母

    BOOL CandidateToString( LPCANDIDATELIST lpCandidateList ); //转换候选文字列表到字符串

public:

    CIM();
    virtual ~CIM();

    LPSTR GetResultString( void );                     //取得输入的字符串

    void UpdateShow( );                                //显示输入法信息

    LPSTR GetCurInputLanguageDesc( );                  //取得应用程序当前使用语言的描述
    void ClearCandidateList( void );                   //清除输入法文字候选列表
    BOOL GetCandidateList( HWND hWnd );                //取得输入法文字候选列表
    BOOL ImeIsOpen( void );                            //输入法是否打开
    void OnChar( TCHAR ch );                           //处理WM_IME_CHAR消息
    void OnImeNotify( HWND hWnd,WPARAM wParam );       //处理WM_IME_NOTIFY消息
    void OnImeComposition( HWND hWnd, LPARAM lParam ); //处理WM_IME_COMPOSITION消息
};

#endif // !defined(AFX_IM_H__6887B165_972D_4D17_8A75_FE07930CE59C__INCLUDED_)



//*********************************************************************************************//

//////////////////////////////////////////////////////////////////////
//
// IM.cpp: CIM class (使用系统)输入法类
// 2001/4/30 Write by Jerry Wang
// 感谢大大鱼的帮助
// Need Lib: imm32.lib
//
//////////////////////////////////////////////////////////////////////

#include "imm.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CIM::CIM()
{
    m_lpszImeInput = new char[_CIM_MAXINPUTCHARNUMBER];
    ZeroMemory( m_lpszImeInput,_CIM_MAXINPUTCHARNUMBER );
    *m_lpszImeInput = '\0';
    *m_cInput = '\0';

    ttffont.Create( "黑体",15,RGB(255,255,255) );
    GetCurInputLanguageDesc();
}

CIM::~CIM()
{
    ZeroMemory( m_lpszImeInput,_CIM_MAXINPUTCHARNUMBER );

    CHKB( delete m_lpszImeInput );
    if( m_lpszCurInputLanguageDesc != NULL )
        CHKB( delete m_lpszCurInputLanguageDesc );
}

void CIM::OnImeComposition(HWND hWnd, LPARAM lParam)
{
    if (lParam & GCS_RESULTSTR)
    {
        HIMC hIMC; //输入设备上下文
        DWORD dwLen;
        LPSTR lpResultStr;

        hIMC = ImmGetContext(hWnd); //取得输入上下文

        if (!hIMC)
            return;

        dwLen = ImmGetCompositionString(hIMC,GCS_RESULTSTR,NULL,0L);
        dwLen+=1;

        if(dwLen)
        {
            lpResultStr = new char[ dwLen ];

            //// 缓冲区已经满了
            if( strlen( m_lpszImeInput ) + dwLen > _CIM_MAXINPUTCHARNUMBER - 2 )
            {
                MessageBeep( 0 );
                return;
            }
            ZeroMemory( lpResultStr ,dwLen );
            if (lpResultStr)
            {
                ImmGetCompositionString(hIMC,GCS_RESULTSTR, lpResultStr,dwLen);
                strcat( m_lpszImeInput,lpResultStr );
            }
            delete lpResultStr;
        }

        ImmReleaseContext(hWnd,hIMC); //释放输入上下文
    }

}

void CIM::OnImeNotify(HWND hWnd, WPARAM wParam)
{
    DWORD dwCommand = (DWORD) wParam;
    switch( dwCommand )
    {
    case IMN_CHANGECANDIDATE:
        GetCandidateList( hWnd );
        break;

    case IMN_CLOSECANDIDATE:
        ClearCandidateList();
        break;

    case IMN_OPENCANDIDATE:
        GetCandidateList( hWnd );
        break;
    }
}

void CIM::OnChar( TCHAR ch )
{
    int len = strlen( m_lpszImeInput );

    if( ImeIsOpen() ) //输入法打开状态
    {

    }
    else //输入法关闭状态
    {
        if( ch >= 32 && ch < 128 && len < _CIM_MAXINPUTCHARNUMBER - 1 ) //输入的是英文字母
        {
            *( m_lpszImeInput + len ) = ch;
            *( m_lpszImeInput + len + 1) = '\0';
        }
    }

    if( ch == 8 ) //BackSpace字符
    {
        if( len == 0 ) //字符串长度为零
            return;

        if( len == 1 ) //只有一个字符
        {
            *m_lpszImeInput = '\0';
            return;
        }

        BYTE cc1,cc2;
        cc1 = *(m_lpszImeInput + len -1); //分离字节
        cc2 = *(m_lpszImeInput + len -2);

        if( cc1 > 0xA0 && cc2 > 0xA0 ) //中文双字节的每个字节都>0xA0
            *( m_lpszImeInput + len -2 ) = '\0';
        else //是英文字符(单字节)
            *( m_lpszImeInput + len -1 ) = '\0';
    }
}

BOOL CIM::GetCandidateList(HWND hWnd)
{
    DWORD dwSize;
    HIMC hIMC;

    ZeroMemory( m_cCandidateList,sizeof(m_cCandidateList) );

    if( m_lpCandList )
    {
        delete m_lpCandList;
        m_lpCandList = NULL;
    }

    if( GetKeyboardLayout(0)==0 )
    {
        return FALSE;
    }

    hIMC = ImmGetContext(hWnd); //取得输入上下文
    if(hIMC == NULL)
    {
        return FALSE;
    }

    ZeroMemory( m_cCandidateList,sizeof(m_cCandidateList) );
    if(dwSize = ImmGetCandidateList(hIMC,0x0,NULL,0))
    {
        m_lpCandList = (LPCANDIDATELIST)new char[dwSize];
        if(m_lpCandList)
        {
            ImmGetCandidateList(hIMC,0x0,m_lpCandList,dwSize);
            CandidateToString(m_lpCandList);
        }
    }

    ImmReleaseContext(hWnd,hIMC);

    return TRUE;
}

void CIM::ClearCandidateList()
{
    if(m_lpCandList)
    {
        delete m_lpCandList;
        m_lpCandList = NULL;
    }
    ZeroMemory( m_cCandidateList,sizeof( m_cCandidateList ) );
}


LPSTR CIM::GetCurInputLanguageDesc()
{
    HKL hKL = GetKeyboardLayout(0);

    if( m_lpszCurInputLanguageDesc != NULL )
        CHKB( delete m_lpszCurInputLanguageDesc ); //删除先 ^o^

    int lengh = ImmGetDescription(hKL,NULL,0); //取得描述的长度

    CHK( m_lpszCurInputLanguageDesc = new char[ lengh ] );

    if( lengh )
    {
        ImmGetDescription(hKL,m_lpszCurInputLanguageDesc,lengh);
    }
    else
    {
        strcpy( m_lpszCurInputLanguageDesc,"输入法关闭" );
    }

    return m_lpszCurInputLanguageDesc;
}

void CIM::UpdateShow()
{
    POINT pt;
    pt.y = 450;
    pt.x = 400;
    ttffont.SetSurface( DD_GetBackScreen() );
    ttffont.ShowText( m_lpszCurInputLanguageDesc,&pt,RGB( 255,255,0 )); //显示输入法描述

    pt.y = 420;
    pt.x = 20;
    ttffont.ShowText( m_cCandidateList,&pt );

    pt.y = 450;
    pt.x = 20;
    if( *m_lpszImeInput == '\0' )
        return;

    ttffont.ShowText( m_lpszImeInput,&pt,RGB( 255,255,0 )); //输入的文字
}

LPSTR CIM::GetResultString()
{
    return m_lpszImeInput;
}

BOOL CIM::CandidateToString(LPCANDIDATELIST lpCandidateList)
{
    if( !m_lpCandList )
        return FALSE;

    if( m_lpCandList->dwCount>0 )
    {
        LPDWORD lpdwOffset;

        lpdwOffset = &m_lpCandList->dwOffset[0];

        lpdwOffset += m_lpCandList->dwPageStart;

        ZeroMemory( m_lpCandList,sizeof( m_lpCandList ) );

        DWORD z=1;
        for (DWORD i = m_lpCandList->dwPageStart; (i < lpCandidateList->dwCount) && (i < m_lpCandList->dwPageStart + m_lpCandList->dwPageSize); i++)
        {
            LPSTR lpstr = (LPSTR)m_lpCandList + *lpdwOffset++;
            char buf[255];
            sprintf( buf,"%d.%s",z,lpstr );
            strcat( m_cCandidateList,buf );
            z++;
        }

        return TRUE;
    }

    return FALSE;
}

BOOL CIM::ImeIsOpen()
{
    return ImmIsIME( GetKeyboardLayout(0) );
}