C++ 字符编码转换类

记录一下C++ 编码转换的函数：

#pragma once
#include "afx.h"


#define DEFAULT_CODE 0
#define CHINESE_SIMPLIFIED 1
#define   CHINESE_TRADITIONAL 2

class CChineseConvertor:
//public CObject
{
public:
    CChineseConvertor(void);
    ~CChineseConvertor(void);
    LPSTR Big52GBKSimplified(char * szText);
    LPSTR Big52GBKTraditional(char * szText);
    LPSTR GBK2Big5(char * szText);
    LPSTR GBKSimplified2GBKTraditional(char * szSimplified);
    LPSTR GBKTraditional2GBKSimplified(char * szTraditional);
    LPWSTR UTF82UNICODE(char*   utf8str);
    LPSTR UNICODE2UTF8(LPCWSTR  strText);

    char *m_pszUnknown;
    // 转换到Unicode
    LPWSTR ToUnicode(char * szSource, int nEncoding);
    LPSTR ToMultiByte(LPCWSTR szSource, int nEncoding);
};

#include "stdafx.h"
#include "Coding.h"


 
CChineseConvertor::CChineseConvertor(void)
{
  m_pszUnknown = new char[2];
  m_pszUnknown[0]=' ';
  m_pszUnknown[1]=0;
}

CChineseConvertor::~CChineseConvertor(void)
{
  delete[] m_pszUnknown;
  m_pszUnknown = NULL;
}

//big5 to GBK_简体
LPSTR CChineseConvertor::Big52GBKSimplified(char * szText)
{
  int nLength;
  wchar_t *pBuffer;
  LPSTR pResult;
  int nResultLength;

  nLength=MultiByteToWideChar(950,0,szText,strlen(szText),NULL,0);
  pBuffer=new wchar_t[nLength+1];
  MultiByteToWideChar(950,0,(LPCSTR)szText,strlen(szText),(LPWSTR)pBuffer,nLength);
  pBuffer[nLength]=0;

  nResultLength=WideCharToMultiByte(936,0,pBuffer,nLength,NULL,0,m_pszUnknown,FALSE);
  pResult=new char[nResultLength+1];
  WideCharToMultiByte(936,0,(LPWSTR)pBuffer,nLength,(LPSTR)pResult,nResultLength,"  ",FALSE);
  pResult[nResultLength]=0;

  return GBKTraditional2GBKSimplified(pResult);
  
}

//big5 to GBK_繁体
LPSTR CChineseConvertor::Big52GBKTraditional(char * szText)
{
  int nLength;
  wchar_t *pBuffer;
  LPSTR pResult;
  int nResultLength;

  nLength=MultiByteToWideChar(950,0,szText,strlen(szText),NULL,0);
  pBuffer=new wchar_t[nLength+1];
  MultiByteToWideChar(950,0,(LPCSTR)szText,strlen(szText),(LPWSTR)pBuffer,nLength);
  pBuffer[nLength]=0;

  nResultLength=WideCharToMultiByte(936,0,pBuffer,nLength,NULL,0,m_pszUnknown,FALSE);
  pResult=new char[nResultLength+1];
  WideCharToMultiByte(936,0,(LPWSTR)pBuffer,nLength,(LPSTR)pResult,nResultLength,"  ",FALSE);
  pResult[nResultLength]=0;

  return pResult;
}

//GBK_简体 to GBK_繁体
LPSTR CChineseConvertor::GBKTraditional2GBKSimplified(char * szTraditional)
{
  LCID dwLocale;
  WORD wLangID;
  wLangID=MAKELANGID(LANG_CHINESE,SUBLANG_CHINESE_SIMPLIFIED);
  dwLocale=MAKELCID(wLangID,SORT_CHINESE_PRC);

  int nLength;
  char *pBuffer;
  nLength=LCMapStringA(dwLocale,LCMAP_SIMPLIFIED_CHINESE,(LPCSTR)szTraditional,strlen(szTraditional),NULL,0);
  pBuffer=new char[nLength+1];
  pBuffer[nLength]=0;
  LCMapStringA(dwLocale,LCMAP_SIMPLIFIED_CHINESE,(LPCSTR)szTraditional,strlen(szTraditional),pBuffer,nLength);
  return pBuffer;
}

//GBK_简体 to big5
LPSTR CChineseConvertor::GBK2Big5(char * szText)
{
  LPSTR szGBKTraditional;
  int nLength;
  wchar_t *pBuffer;
  LPSTR pResult;
  int nResultLength;

  szGBKTraditional=GBKSimplified2GBKTraditional(szText);
  nLength=MultiByteToWideChar(936,0,szGBKTraditional,strlen(szGBKTraditional),NULL,0);
  pBuffer=new wchar_t[nLength+1];
  MultiByteToWideChar(936,0,(LPCSTR)szGBKTraditional,strlen(szGBKTraditional),(LPWSTR)pBuffer,nLength);
  pBuffer[nLength]=0;

  nResultLength=WideCharToMultiByte(950,0,pBuffer,nLength,NULL,0,m_pszUnknown,FALSE);
  pResult=new char[nResultLength+1];
  WideCharToMultiByte(950,0,(LPWSTR)pBuffer,nLength,(LPSTR)pResult,nResultLength,"  ",FALSE);
  pResult[nResultLength]=0;

  return pResult;
}

//将GBK的简体转换到GBK繁体
LPSTR CChineseConvertor::GBKSimplified2GBKTraditional(char * szSimplified)
{
  LCID dwLocale;
  WORD wLangID;
  wLangID=MAKELANGID(LANG_CHINESE,SUBLANG_CHINESE_SIMPLIFIED);
  dwLocale=MAKELCID(wLangID,SORT_CHINESE_PRC);

  int nLength;
  char *pBuffer;
  nLength=LCMapStringA(dwLocale,LCMAP_TRADITIONAL_CHINESE,(LPCSTR)szSimplified,strlen(szSimplified),NULL,0);
  pBuffer=new char[nLength+1];
  pBuffer[nLength]=0;
  LCMapStringA(dwLocale,LCMAP_TRADITIONAL_CHINESE,(LPCSTR)szSimplified,strlen(szSimplified),pBuffer,nLength);
  return pBuffer;
}

// 转换到Unicode
LPWSTR CChineseConvertor::ToUnicode(char * szSource, int nEncoding)
{
  int nLength;
  wchar_t *pBuffer;
  int nLanguage;

  if(nEncoding==CHINESE_SIMPLIFIED)
    nLanguage=936;
  else
    if(nEncoding==CHINESE_TRADITIONAL)
      nLanguage=950;
    else
      nLanguage= CP_ACP;

  nLength=MultiByteToWideChar(nLanguage,0,szSource,strlen(szSource),NULL,0);
  pBuffer=new wchar_t[nLength+1];
  MultiByteToWideChar(nLanguage,0,(LPCSTR)szSource,strlen(szSource),(LPWSTR)pBuffer,nLength);
  pBuffer[nLength]=0;

  return pBuffer;
}

//转换到多字节
LPSTR CChineseConvertor::ToMultiByte(LPCWSTR szSource, int nEncoding)
{
  int nLength;
  char *pBuffer;
  int nLanguage;

  if(nEncoding==CHINESE_SIMPLIFIED)
    nLanguage=936;
  else
    if(nEncoding==CHINESE_TRADITIONAL)
      nLanguage=950;
    else
      nLanguage= CP_ACP;

  nLength=WideCharToMultiByte(nLanguage,0,szSource,wcslen(szSource),NULL,0,m_pszUnknown,FALSE);

  pBuffer=new char[nLength+1];
  WideCharToMultiByte(nLanguage,0,szSource,wcslen(szSource),pBuffer,nLength,m_pszUnknown,FALSE);
  pBuffer[nLength]=0;

  return pBuffer;

}

//UTF8转换到UNICODE
LPWSTR CChineseConvertor::UTF82UNICODE(char*   utf8str) 
{
    int nLength;
    wchar_t *pBuffer;
    
    nLength=MultiByteToWideChar(CP_UTF8,0,utf8str,strlen(utf8str),NULL,0);
    pBuffer=new wchar_t[nLength+1];
    MultiByteToWideChar(CP_UTF8,0,(LPCSTR)utf8str,strlen(utf8str),(LPWSTR)pBuffer,nLength);
    pBuffer[nLength]=0;
    
    return pBuffer;
}

//UNICODE转换到UTF8
LPSTR CChineseConvertor::UNICODE2UTF8(LPCWSTR  strText) 
{
    int len;  
    len = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR)strText, -1, NULL, 0, NULL, NULL);  
    char *szUtf8=new char[2*(len + 1)];
    memset(szUtf8, 0, len * 2 + 2);  //UTF8最多的字节数最多是一个UINICODE字符所占字节数的两倍
    WideCharToMultiByte (CP_UTF8, 0, (LPCWSTR)strText, -1, szUtf8, len, NULL,NULL);
    return szUtf8;
    
}