C++ 中的 Unicode 與 UTF-8 字符編碼互轉

Unicode 轉 UTF-8

std::string  UnicodeToUTF8(const std::wstring& wstr)
{
	int ansiiLen = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, nullptr, 0, nullptr, nullptr);
	char* pAssii = (char*)malloc(sizeof(char) * ansiiLen);
	WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, pAssii, ansiiLen, nullptr, nullptr);
	std::string ret_str = pAssii;
	free(pAssii);
	return ret_str;
}

UTF-8 轉 Unicode

char* UTF8ToUnicode(char* szU8)
{
	int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8), NULL, 0);
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8), wszString, wcsLen);
	wszString[wcsLen] = '\0';
	char* m_char;
	int len = WideCharToMultiByte(CP_ACP, 0, wszString, wcslen(wszString), NULL, 0, NULL, NULL);
	m_char = new char[len + 1];
	WideCharToMultiByte(CP_ACP, 0, wszString, wcslen(wszString), m_char, len, NULL, NULL);
	m_char[len] = '\0';
	return m_char;
}