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    在做字符串、文本操作时，我们时常会需要在wchar_t *和char *之间做转换或搭桥。直接用API，参数太多不容易记住，常常要查文档，浪费不少时间。为了自己方便，对简单的转换写了一个简单的转换包装类。下次或者用得着，帖代码做为保存。
    顺便提一下：发现有个东西很好用，std::stringstream系列 (#include < sstream >)；其实，流式操作用起来都很happy，还有iostream、fstream；还有TCP的数据也是流式的。


头文件：string.h

#pragma once
#ifndef __STRING__
#define __STRING__
/**
 * 以下代码由张家旺编写完成于2007-12-5，借用请保留该声明。
 */
namespace useful
{

 class translator
 {
 public:
  static wchar_t *translate(
   const char *str,size_t sub,wchar_t buf[],size_t num );
  static char *translate(
   const wchar_t *str,size_t sub,char buf[],size_t num );
  const wchar_t *translate( const char *str,size_t sub = -1 );
  const char *translate( const wchar_t *str,size_t sub = -1 );
  translator( void );
  ~translator( void );
  static translator &instance( void );
 private:
  void buffer( size_t len )
  {
   if( len > m_len )
   {
    delete[] m_buf;
    m_buf = new char[len];
    m_len = len;
   }
  }
  char *m_buf;
  size_t m_len;
 };

};

#endif //__STRING__

实现文件：string.cpp

#include < string >
#include < windows.h >
#include "./string.h"
#pragma warning( disable : 4267 )
namespace useful
{

 translator::translator( void ) : m_buf( 0 ),m_len( 0 )
 {
 }
 translator::~translator( void )
 {
  delete[] m_buf;
 }
 translator &translator::instance( void )
 {
  static translator impl = translator();
  return impl;
 }

 wchar_t *translator::translate(
  const char *str,size_t sub,wchar_t buf[],size_t num )
 {
  ::MultiByteToWideChar( CP_OEMCP,0,str,sub,buf,num );
  return buf;
 }
 char *translator::translate(
  const wchar_t *str,size_t sub,char buf[],size_t num )
 {
  ::WideCharToMultiByte( CP_OEMCP,0,str,sub,buf,num,0,0 );
  return buf;
 }
 const wchar_t *translator::translate( const char *str,size_t sub )
 {
  if( sub == std::string::npos ) sub = strlen( str );
  buffer( (sub+1) * 2 );
  wchar_t *buf = reinterpret_cast< wchar_t * >( m_buf );
  buf[sub] = L'\0';
  return translate( str,sub,buf,sub );
 }
 const char *translator::translate( const wchar_t *str,size_t sub )
 {
  if( sub == std::wstring::npos ) sub = wcslen( str );
  buffer( sub + 1 );
  m_buf[sub] = '\0';
  return translate( str,sub,m_buf,sub );
 }

};

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