格式转换1

using namespace std;

class Convert
{
public:

static wstring string2wstring(const string& s)
{
int len;
int slength = (int)s.length() + 1;
len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);
wchar_t* buf = new wchar_t[len];
MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
std::wstring r(buf);
delete[] buf;

return r;
}


static wstring ANSIToUnicode( const string& str )
{
int len = str.length();

int unicodeLen = ::MultiByteToWideChar( CP_ACP, 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_ACP, 0, str.c_str(), -1, (LPWSTR)pUnicode, unicodeLen );


wstring rt = ( wchar_t* )pUnicode;
delete pUnicode;

return rt;
}


static string UnicodeToANSI( const wstring& str )
{
char* pElementText;
int iTextLen;

// wide char to multi char
iTextLen = 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 = pElementText;
delete[] pElementText;

return strText;
}


static wstring UTF8ToUnicode( const string& str )
{
int 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 = ( wchar_t* )pUnicode;
delete pUnicode;

return rt;
}


static string UnicodeToUTF8( const wstring& str )
{
char* pElementText;
int iTextLen;

// wide char to multi char
iTextLen = 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 = pElementText;
delete[] pElementText;

return strText;
}

};