wstring与string互转

std::wstring StringToWString(const std::string &strSrc)
{
	int nLen = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)strSrc.c_str(), strSrc.length(), 0, 0);
	if (nLen <= 0) return std::wstring(L"");

	WCHAR *pwszDst = new WCHAR[nLen + 1];
	if (NULL == pwszDst) return std::wstring(L"");
	memset(pwszDst, 0, nLen + 1);

	MultiByteToWideChar(CP_ACP, 0, (LPCSTR)strSrc.c_str(), strSrc.length(), pwszDst, nLen);
	pwszDst[nLen] = 0;

	std::wstring wstrTemp(pwszDst);
	delete pwszDst;
	pwszDst = NULL;
	return wstrTemp;
}

std::string WStringToString(const std::wstring &wstrSrc)
{
	int nLen = WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)wstrSrc.c_str(), -1, NULL, 0, NULL, NULL);
	if (nLen <= 0) return std::string("");

	char* pszDst = new char[nLen + 1];
	if (NULL == pszDst) return std::string("");
	memset(pszDst, 0, nLen + 1);

	WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)wstrSrc.c_str(), -1, pszDst, nLen, NULL, NULL);
	pszDst[nLen] = 0;

	std::string strTemp(pszDst);
	delete[] pszDst;
	pszDst = NULL;
	return strTemp;
}