Commonly used method of character conversion

1, char turn utf-8

int char2Utf8(const char *src, char **ret)
{
	int nret;
	int len = 0;
	WCHAR   *pwchar = 0;
	int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
	len = MultiByteToWideChar(codepage, 0, src, -1, NULL, 0);
	pwchar = (WCHAR *)malloc(sizeof(WCHAR)*len);
	nret = MultiByteToWideChar(codepage, 0, src, -1, pwchar, len);
	if (nret < 0)
		return nret;

	len = WideCharToMultiByte(CP_UTF8, 0, pwchar, -1, 0, 0, 0, 0);
	*ret = (char*)malloc(len + 1);
	nret = WideCharToMultiByte(CP_UTF8, 0, pwchar, -1, *ret, len, 0, 0);
	free(pwchar);
	return nret;
}

　　2, utf-8 transfected char

int Utf2char(char *src, char** ret)
{
	int nret;
	WCHAR   *pwchar = 0;
	int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
	nret = MultiByteToWideChar(CP_UTF8, 0, src, -1, NULL, 0);
	pwchar = (WCHAR *)malloc(sizeof(WCHAR)*nret);
	nret = MultiByteToWideChar(CP_UTF8, 0, src, -1, pwchar, nret);

	nret = WideCharToMultiByte(codepage, 0, pwchar, -1, 0, 0, 0, 0);
	*ret = (char*)malloc(nret + 1);
	nret = WideCharToMultiByte(codepage, 0, pwchar, -1, *ret, nret, 0, 0);
	free(pwchar);
	return nret;

}

　　3, url transfer utf-8

string urlUtf8(char *str)
{
	string dd;
	string ascii = str;
	char utf8[BUFFER_LEN * 5];
	memset(utf8, 0x00, BUFFER_LEN * 5);
	ASCIIToUTF8_string(ascii, utf8);
	string tt = utf8;

	size_t len = tt.length();
	for (size_t i = 0; i < len; i++)
	{
		if (isalnum((BYTE)tt.at(i)))
		{
			char tempbuff[2] = { 0 };
			sprintf(tempbuff, "%c", (BYTE)tt.at(i));
			dd.append(tempbuff);
		}
		else if (isspace((BYTE)tt.at(i)))
		{
			dd.append("+");
		}
		else
		{
			char tempbuff[4];
			sprintf (tempbuff, "% X-X-%%%", ((BYTE) tt.at (I)) >>. 4, ((BYTE) tt.at (I)) 16%); 
			dd.append (tempbuff); 
		} 

	} 
	return dd; 
} 

void ASCIIToUTF8_string (String & cACSII, cUTF8 char *) 
{ 
	// first ASCII code is converted to Unicode encoding   
	int nlen = MultiByteToWideChar (CP_ACP, 0 , cACSII.c_str (), -1, NULL, NULL); 
	* = pUnicode new new wchar_t wchar_t [cACSII.size () *. 3]; 
	Memset (pUnicode, 0, * nLen the sizeof (wchar_t)); 
	the MultiByteToWideChar (CP_ACP, 0, cACSII.c_str (), -1, (LPWSTR) pUnicode, nLen); 
	wstring wsUnicode = pUnicode; 
	// convert Unicode encoded as UTF-8 encoding   
	nlen = WideCharToMultiByte (CP_UTF8, 0, wsUnicode.c_str (), -1, NULL, 0, NULL, NULL); 
	WideCharToMultiByte (CP_UTF8, 0, wsUnicode.c_str ( ), -1, cUTF8, nlen, NULL, NULL); 

}

　　4 generates a random number of bits specified

std::string GetRandString(size_t size)
{
	time_t tCurTime = 0;
	int iRandValue = 0;
	int i;
	unsigned int state = 0;
	tCurTime = time(NULL);
	srand((unsigned int)tCurTime);
	char buf[255];
	for (i = 0; i < size; i++)
	{
		buf[i] = '0' + (rand() % 10);
	}

	buf[i] = '\0';
	return buf;
}

　　5, to obtain the current time timestamp

string GetTimeStamp()
{
	time_t curtime = time(NULL);
	tm *ptm = localtime(&curtime);
	char buf[64];
	sprintf(buf, "%d%02d%02d%02d%02d%02d", ptm->tm_year + 1900, ptm->tm_mon + 1,
		ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
	return buf;

}