多字节

void ConvertGBKToUtf8(CString& strGBK)
{
int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
unsigned short * wszUtf8 = new unsigned short[len+1];
memset(wszUtf8, 0, len * 2 + 2);
MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, wszUtf8, len);

len = WideCharToMultiByte(CP_UTF8, 0, wszUtf8, -1, NULL, 0, NULL, NULL);
char *szUtf8=new char[len + 1];
memset(szUtf8, 0, len + 1);
WideCharToMultiByte (CP_UTF8, 0, wszUtf8, -1, szUtf8, len, NULL,NULL);

strGBK = szUtf8;
delete[] szUtf8;
delete[] wszUtf8;
}

void ConvertUtf8ToGBK(CString& strUtf8)
{
int len=MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, NULL,0);
unsigned short * wszGBK = new unsigned short[len+1];
memset(wszGBK, 0, len * 2 + 2);
MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, wszGBK, len);

len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
char *szGBK=new char[len + 1];
memset(szGBK, 0, len + 1);
WideCharToMultiByte (CP_ACP, 0, wszGBK, -1, szGBK, len, NULL,NULL);

strUtf8 = szGBK;
delete[] szGBK;
delete[] wszGBK;
}

qp::StringW Global::AnsiToUnicode(const char* buf)
{
int len = ::MultiByteToWideChar(CP_ACP, 0, buf, -1, NULL, 0);
if (len == 0) return L"";

std::vector<wchar_t> unicode(len);
::MultiByteToWideChar(CP_ACP, 0, buf, -1, &unicode[0], len);

return &unicode[0];
}

qp::StringA Global::UnicodeToAnsi(const wchar_t* buf)
{
int len = ::WideCharToMultiByte(CP_ACP, 0, buf, -1, NULL, 0, NULL, NULL);
if (len == 0) return "";

std::vector utf8(len);
::WideCharToMultiByte(CP_ACP, 0, buf, -1, &utf8[0], len, NULL, NULL);

return &utf8[0];
}

qp::StringW Global::Utf8ToUnicode(const char* buf)
{
int len = ::MultiByteToWideChar(CP_UTF8, 0, buf, -1, NULL, 0);
if (len == 0) return L"";

std::vector<wchar_t> unicode(len);
::MultiByteToWideChar(CP_UTF8, 0, buf, -1, &unicode[0], len);

return &unicode[0];
}

qp::StringA Global::UnicodeToUtf8(const wchar_t* buf)
{
int len = ::WideCharToMultiByte(CP_UTF8, 0, buf, -1, NULL, 0, NULL, NULL);
if (len == 0) return "";

std::vector utf8(len);
::WideCharToMultiByte(CP_UTF8, 0, buf, -1, &utf8[0], len, NULL, NULL);

return &utf8[0];
}