1 // ANSI to Unicode
 2 #include <string>
 3 using namespace std;
 4 wstring ANSIToUnicode( const string& str )
 5 {
 6     int  len = 0;
 7     len = str.length();
 8     // 返回转换后unicode的长度
 9     int  unicodeLen = ::MultiByteToWideChar(
10         CP_ACP,            // 实现ANSI与Unicode之间的转换
11         0,                //
12         str.c_str(),    // 转码前的数据
13         -1,
14         NULL,
15         0 );
16     // 申请内存
17     wchar_t *  pUnicode;
18     pUnicode = new  wchar_t[unicodeLen+1];
19     // 初始化申请的内存
20     memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t));
21     ::MultiByteToWideChar(
22         CP_ACP,
23         0,
24         str.c_str(),        // 转换前数据
25         -1,
26         (LPWSTR)pUnicode,    // 转换后数据
27         unicodeLen );        // 转换长度
28     wstring  rt;
29     rt = ( wchar_t* )pUnicode;
30     delete  pUnicode;        // 删除申请的内存
31
32     return  rt;
33 }

// Unicode To ANSI
string UnicodeToANSI( const wstring& str )
{char*     pElementText;int    iTextLen;// wide char to multi chariTextLen = WideCharToMultiByte( CP_ACP,0,str.c_str(),-1,NULL,0,NULL,NULL );pElementText = new char[iTextLen + 1];memset( ( void* )pElementText, 0, sizeof( char ) * ( iTextLen + 1 ) );::WideCharToMultiByte( CP_ACP,0,str.c_str(),-1,pElementText,iTextLen,NULL,NULL );string strText;strText = pElementText;delete[] pElementText;return strText;
}

//UTF8 To Unicode
wstring UTF8ToUnicode( const string& str )
{int  len = 0;len = str.length();int  unicodeLen = ::MultiByteToWideChar( CP_UTF8,0,str.c_str(),-1,NULL,0 );  wchar_t *  pUnicode;  pUnicode = new  wchar_t[unicodeLen+1];  memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t));  ::MultiByteToWideChar( CP_UTF8,0,str.c_str(),-1,(LPWSTR)pUnicode,unicodeLen );  wstring  rt;  rt = ( wchar_t* )pUnicode;delete  pUnicode; return  rt;
}

// Unicode To UTF8
string UnicodeToUTF8( const wstring& str )
{char*     pElementText;int          iTextLen;// wide char to multi chariTextLen = WideCharToMultiByte( CP_UTF8,0,str.c_str(),-1,NULL,0,NULL,NULL );pElementText = new char[iTextLen + 1];memset( ( void* )pElementText, 0, sizeof( char ) * ( iTextLen + 1 ) );::WideCharToMultiByte( CP_UTF8,0,str.c_str(),-1,pElementText,iTextLen,NULL,NULL );string strText;strText = pElementText;delete[] pElementText;return strText;
}