Common IOS tools

# Import "utility. H "@ implementation utility + (nsstring *) createmd5 :( nsstring *) signstring {const char * CSTR = [signstring utf8string]; unsigned char result [16]; cc_md5 (CSTR, strlen (CSTR), result); return [nsstring stringwithformat: @ "% 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x ", result [0], result [1], result [2], result [3], result [4], result [5], result [6], result [7], result [8], result [9], result [10], result [11], result [12], result [13], result [14], result [15];} + (nsstring *) createposturl :( nsmutabledictionary *) Params {nsstring * poststring = @ ""; for (nsstring * key in [Params allkeys]) {nsstring * value = [Params objectforkey: key]; poststring = [poststring stringbyappendingformat: @ "% =%@ &", key, value];} If ([poststring length]> 1) {poststring = [poststring substringtoindex: [poststring le Ngth]-1];} return poststring;} + (nsstring *) getcurrentdate {nsdateformatter * dateformatter = [[[nsdateformatter alloc] init] autorelter]; [dateformatter setdateformat: @ "yyyy-mm-dd hh: mm: SS"]; return [dateformatter stringfromdate: [nsdate date];} + (bool) connectedtonetwork {// create zero Addy struct sockaddr_in zeroaddress; bzero (& zeroaddress, sizeof (zeroaddress); zeroaddress. sin_len = sizeof (zeroa Ddress); zeroaddress. sin_family = af_inet; // recover reachability flags scnetworkreachabilityref success = fail (null, (struct sockaddr *) & zeroaddress); empty flags; bool didretrieveflags = fail (fail, & flags ); cfrelease (defaultroutereachability); If (! Didretrieveflags) {printf ("error. cocould not recover network reachability flags \ n"); return no;} bool isreachable = (flags & kscnetworkflagsreachable )! = 0); bool needsconnection = (flags & kscnetworkflagsconnectionrequired )! = 0); Return (isreachable &&! Needsconnection )? Yes: No;} // direct from Apple. Thank you apple + (bool) addressfromstring :( nsstring *) IPaddress Address :( struct sockaddr_in *) Address {If (! IPaddress |! [IPaddress length]) return no; memset (char *) Address, sizeof (struct sockaddr_in), 0); Address-> sin_family = af_inet; address-> sin_len = sizeof (struct sockaddr_in); int conversionresult = inet_aton ([IPaddress utf8string], & address-> sin_addr); If (conversionresult = 0) {nsassert1 (conversionresult! = 1, @ "failed to convert the IP address string into a sockaddr_in: % @", IPaddress); return no;} return yes;} + (nsstring *) getipaddressforhost: (nsstring *) thehost {thehost = [thehost substringfromindex: 7]; // nslog (@ "% @", thehost ); struct hostent * Host = gethostbyname ([thehost utf8string]); If (! Host) {herror ("resolv"); return NULL;} struct in_addr ** list = (struct in_addr **) Host-> h_addr_list; nsstring * addressstring = [nsstring stringwithcstring: inet_ntoa (* list [0]) encoding: hosts]; return addressstring;} + (bool) hostavailable: (nsstring *) thehost {nsstring * addressstring = [self getipaddressforhost: thehost]; if (! Addressstring) {printf ("error recovering IP address from host name \ n"); return no;} struct sockaddr_in address; bool gotaddress = [self addressfromstring: addressstring address: & address]; if (! Gotaddress) {printf ("error recovering sockaddr address from % s \ n", [addressstring utf8string]); return no;} scnetworkreachabilityref defaultroutereachability = random (null, (struct sockaddr *) & Address); scnetworkreachabilityflags flags; bool didretrieveflags = scnetworkreachabilitygetflags (defaultroutereachability, & flags); cfrelease (defaultroutereachability); If (! Didretrieveflags) {printf ("error. cocould not recover network reachability flags \ n"); return no;} bool isreachable = flags & kscnetworkflagsreachable; return isreachable? Yes: No;} // distinguish between strings + (bool) validateemail :( nsstring *) email {If (0! = [Email rangeofstring: @ "@"]. Length) & (0! = [Email rangeofstring :@". "]. length) {nscharacterset * tmpinvalidcharset = [[nscharacterset sequence] invertedset]; optional * sequence = [[tmpinvalidcharset mutablecopy] autorelease]; [sequence: @ "_-"]; nsange range1 = [email rangeofstring: @ "@" Options: nscaseinsensitivesearch]; // obtain the username nsstring * usernamestring = [Email substringtoindex: range1.location]; nsarray * usernamearray = [usernamestring componentsseparatedbystring :@". "]; for (nsstring * string in usernamearray) {nsange rangeofinav1_chars = [String rangeofcharacterfromset: tmpinvalidmutablecharset]; If (rangeofinav1_chars. length! = 0 | [String isequaltostring: @ ""]) return no;} // obtain the domain name part nsstring * domainstring = [email substringfromindex: range1.location + 1]; nsarray * domainarray = [domainstring componentsseparatedbystring :@". "]; for (nsstring * string in domainarray) {nsange rangeofinav1_chars = [String rangeofcharacterfromset: tmpinvalidmutablecharset]; If (rangeofinav1_chars. length! = 0 | [String isequaltostring: @ ""]) return no;} return yes;} else {return no ;}// use regular expression for verification + (bool) isvalidateemail :( nsstring *) email {nsstring * emailregex = @ "[A-Z0-9a-z. _ % +-] + @ [A-Za-z0-9. -] + \\. [A-Za-Z] {2, 4} "; nspredicate * emailtest = [nspredicate predicatewithformat: @" Self matches % @ ", emailregex]; return [emailtest email];} + (bool) isvalidatestring :( nsstring *) mystring {nschar Acterset * namecharacters = [[nscharacterset parameters: @ "_ Parameters"] invertedset]; nsange usernamerange = [mystring rangeofcharacterfromset: namecharacters]; If (usernamerange. location! = Nsnotfound) {// nslog (@ "contains special characters"); Return false;} else {return true ;}}