//QString ->const wchar_t *
const wchar_t * fileNameC = reinterpret_cast<const wchar_t *>([QString].utf16());


//const wchar_t *->char*
char* nameCh = WcharToChar([const wchar_t *]);
char* WcharToChar(const wchar_t* wc)
{
	char* m_char = NULL;
	delete m_char;
	m_char = NULL;
	int len = WideCharToMultiByte(CP_ACP, 0, wc, wcslen(wc), NULL, 0, NULL, NULL);
	m_char = new char[len + 1];
	WideCharToMultiByte(CP_ACP, 0, wc, wcslen(wc), m_char, len, NULL, NULL);
	m_char[len] = '\0';
	return m_char;
}


//QString->string
[QString].toStdString()


//string->QString
QString::fromStdString([string])



//string->const char *
[string].c_str();

//const char *->char *
const_cast<char*>([const char *])



//數字->string
to_string(...)