multilanguage.cpp

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/*
*  Openmysee
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*/
// MultiLanguage.cpp : Defines the entry point for the DLL application.
//

#include <assert.h>
#include "MultiLanguage.h"

StringMapLoader g_loader;
HMODULE g_module;

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID /*lpReserved*/
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		g_module = (HMODULE)hModule;
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
    return TRUE;
}

StringMapLoader::StringMapLoader(void)
{
	m_mapLangId2Str[DEFAULT_LANG_ID] = "en_US";
	m_mapLangId2Str[TAIWAN_LANG_ID] = "zh_TW";
	m_mapLangId2Str[HONGKONG_LANG_ID] = "zh_TW";
	m_mapLangId2Str[MAINLAND_LANG_ID] = "zh_CN";
	m_idCurLang = 0xffff;

	// load preferred language
	LANGID id = DetectLanguage();
	if(!SwitchLanguage(id)) {
		// load default language
		if(!SwitchLanguage(DEFAULT_LANG_ID)) {
			return;
		}
	}
	m_idCurLang = id;
}

StringMapLoader::~StringMapLoader(void)
{
}

bool StringMapLoader::SwitchLanguage(
									 const LANGID langID	// in, 语言ID	
									 )
{
	// get file name of target language 
	char buf[1024];
	if(::GetModuleFileNameA(g_module, buf, 1024) == 0)
		return false;
	char* temp = strrchr(buf, '\\');
	if(temp == NULL)
		return false;
	temp[1] = '\0';
	string filename = buf;
	filename.append(g_loader.m_mapLangId2Str[langID]);
	filename.append(".ini");

	// load preferred language
	if(!g_loader.LoadLanguageFile(filename))
		return false;

	g_loader.m_idCurLang = langID;
	return true;
}

bool StringMapLoader::GetCurLanguage(
									 LANGID& langID			// out, 当前语言的ID
									 )
{
	langID = g_loader.m_idCurLang;
	return (g_loader.m_idCurLang != 0xffff);
}
UINT StringMapLoader::GetStrByStr(
									const LPCTSTR keyStr,	// in, 索引字符串
									LPTSTR buf,				// out, 存储字符串的缓冲区
									const UINT bufSize		// in, 缓冲区的大小
									)
{
	if(!buf || !keyStr)
		return 0;
	buf[0] = 0;

	tstring key = keyStr;
	tstring valStr = g_loader.m_mapKeyStr2ValStr[key];
	if(valStr.empty() || bufSize <= valStr.size())
		return 0;
	
	_tcscpy(buf, valStr.data());
	return static_cast<UINT>(valStr.size());
}

bool StringMapLoader::LoadLanguageFile(const string &filename)
{
	if(filename.size() <= 0)
		return false;

	// open language file
	tifstream ifs;
	ifs.open(filename.c_str());
	if(!ifs || !ifs.is_open())
	{
		ifs.close();
		return false;
	}

	// read language strings
	tstring line;
	tstring name;
	tstring value;
	size_t posEqual;
	while(getline(ifs, line, TEXT('\n')))
	{
		if(!line.length())
			continue;
		if(line[0] == TEXT('#'))
			continue; // 注释行
		if(line[0] == TEXT(';'))
			continue; // 注释行

		posEqual=line.find(TEXT('='));
		if(posEqual == -1)
			continue;
		name = line.substr(0,posEqual);
		value = line.substr(posEqual+1);
		size_t index = value.find(TEXT('\r'));
		if(index != -1)
			value = value.substr(0, index);
		index = value.find(TEXT('\n'));
		if(index != -1)
			value = value.substr(0, index);

		// add to map
		m_mapKeyStr2ValStr[name] = value;
	}

	ifs.close();
	return true;
}

// The following functions contain code to
// detect the language in which the initial
// user interface should be displayed

BOOL CALLBACK EnumLangProc(HANDLE /*hModule*/, LPCTSTR /*lpszType*/, LPCTSTR /*lpszName*/,
						   WORD wIDLanguage, LONG_PTR lParam)
{
    PLANGINFO LangInfo;

    LangInfo = (PLANGINFO) lParam;
    LangInfo->Count++;
    LangInfo->LangID  = wIDLanguage;

    return TRUE;        // continue enumeration
}

// Detects the language of ntdll.dll with some specific processing for 
// the Hongkong SAR version
LANGID StringMapLoader::GetNTDLLNativeLangID()
{

    LANGINFO LangInfo;
	LPCTSTR Type = (LPCTSTR) ((LPVOID)((WORD)16));
    LPCTSTR Name = (LPCTSTR) 1;

    ZeroMemory(&LangInfo,sizeof(LangInfo));
    
    // Get the HModule for ntdll.
    HMODULE hMod = GetModuleHandle(TEXT("ntdll.dll"));
    if (hMod==NULL)
        return 0;

    BOOL result = EnumResourceLanguages(hMod, Type, Name, (ENUMRESLANGPROC)EnumLangProc, (LONG_PTR) &LangInfo);
    
    if (!result || (LangInfo.Count > 2) || (LangInfo.Count < 1) )
        return 0;
    
    return LangInfo.LangID;
}

// Checks if NT4 system is Hongkong SAR version
BOOL StringMapLoader::IsHongKongVersion()
{
    HMODULE hMod;
    BOOL bRet=FALSE;
	typedef BOOL (WINAPI *IMMRELEASECONTEXT)(HWND,HIMC);
    IMMRELEASECONTEXT pImmReleaseContext;

    hMod = LoadLibrary(TEXT("imm32.dll"));
    if (hMod)
	{
        pImmReleaseContext = (IMMRELEASECONTEXT)GetProcAddress(hMod,"ImmReleaseContext");
        if (pImmReleaseContext)
            bRet = pImmReleaseContext(NULL,NULL);
        FreeLibrary(hMod);
    }
    return bRet;
}

// This function detects a correct initial UI language for all
// platforms (Win9x, ME, NT4, Windows 2000, Windows XP)
LANGID StringMapLoader::DetectLanguage()
{
	OSVERSIONINFO		VersionInfo;
	LANGID				uiLangID = 0;
	HKEY				hKey;
	DWORD				Type, BuffLen = MAX_KEY_BUFFER;
	TCHAR				LangKeyValue[MAX_KEY_BUFFER];


	VersionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
	if( !GetVersionEx(&VersionInfo) )
		return 0;

	switch( VersionInfo.dwPlatformId )
	{
		// On Windows NT, Windows 2000 or higher
		case VER_PLATFORM_WIN32_NT:
			if( VersionInfo.dwMajorVersion >= 5)   // Windows 2000 or higher
			{
				typedef LANGID (WINAPI *Proc_GetUserDefaultUILanguage)();
				HMODULE hmodule = LoadLibrary(_T("Kernel32"));
				Proc_GetUserDefaultUILanguage procGetUserDefaultUILanguage = 
					(Proc_GetUserDefaultUILanguage) GetProcAddress(hmodule, "GetUserDefaultUILanguage");
				assert(procGetUserDefaultUILanguage);
				if(procGetUserDefaultUILanguage)
					uiLangID = procGetUserDefaultUILanguage();
				else
					uiLangID = 0;
			}
			else
			{   // for NT4 check the language of ntdll.dll
				uiLangID = GetNTDLLNativeLangID();   
				if (uiLangID == DEFAULT_LANG_ID)
				{		// special processing for Honkong SAR version of NT4
					if (IsHongKongVersion())
						uiLangID = HONGKONG_LANG_ID;
				}
			}
			break;
		// On Windows 95, Windows 98 or Windows ME
		case VER_PLATFORM_WIN32_WINDOWS:
			// Open the registry key for the UI language
			if( RegOpenKeyEx(HKEY_CURRENT_USER,TEXT("Default\\Control Panel\\Desktop\\ResourceLocale"), 0, KEY_QUERY_VALUE, &hKey) == ERROR_SUCCESS )
			{
				// Get the type of the default key
				if( RegQueryValueEx(hKey, NULL, NULL, &Type, NULL, NULL) == ERROR_SUCCESS && Type == REG_SZ )
				{
					// Read the key value
					if( RegQueryValueEx(hKey, NULL, NULL, &Type, (LPBYTE)LangKeyValue, &BuffLen) == ERROR_SUCCESS )
						uiLangID = static_cast<LANGID>(_ttoi(LangKeyValue));
				}
				RegCloseKey(hKey);
			}
			break;
	}

    if (uiLangID == 0)
        uiLangID = GetUserDefaultLangID();

    // Return the found language ID.
    return uiLangID;
}