nsstring

I have 2 new questions: 1) Consider this line: NSString *myString = [[NSString alloc] initWithString: @"Value"]; There were two things I learned, but I would like confirmation: As I learned, the "alloc" message indicates that the instance of NSString will be stored in the "heap" memory. I understood also that primitive variables such as "chars" are stored in the "stack" memory. Does this mean that: the instance of NSString is stored in the heap memory; AND that this object has an iVar pointer (when the initWithString method was called) to the "Value" string of primitive "chars", which reside

I have an array of strings (names) and i would like to sort them like how the address book on the iphone sorts them eg: éli -> under E eg: àli -> under A eg: 4li -> under # any suggestions? You need to perform a diacritic insensitive comparison against the strings. NSString has a compare:options: method with an option of NSDiacriticInsensitiveSearch . NSArray *array = [NSArray arrayWithObjects:@"éli", @"bob", @"earl", @"allen", @"àli", @"aaron", nil]; NSArray *sorted = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) { return [(NSString*)obj1 compare:obj2 options

I have 5 String i want that they must be store in singe NSString all the values separate with | sign NSString *first=@"Ali"; NSString *second=@"Imran"; NSString *third=@"AliImran"; NSString *fourth=@"ImranAli"; NSString *fifth=@"Ali Imran Jamshed"; I want to all these in single NSString to store and all values separated by given sign. NSArray *myStrings = [[NSArray alloc] initWithObjects:first, second, third, fourth, fifth, nil]; NSString *joinedString = [myStrings componentsJoinedByString:@"|"]; // release myStrings if not using ARC. you can try .... NSString *joinString=[NSString

iOS，一行代码进行RSA、DES 、AES、MD5加密、解密 加密的Demo，欢迎下载 java端的加密解密，读者可以看我同事的这篇文章 http://www.jianshu.com/p/98569e81cc0b 最近做了一个移动项目，是有服务器和客户端类型的项目，客户端是要登录才行的，服务器也会返回数据，服务器是用Java开发的，客户端要同时支持多平台（Android、iOS），在处理iOS的数据加密的时候遇到了一些问题。起初采取的方案是DES加密，老大说DES加密是对称的，网络抓包加上反编译可能会被破解，故采取RSA方式加密。RSA加密时需要公钥和私钥，客户端保存公钥加密数据，服务器保存私钥解密数据。（iOS端公钥加密私钥解密、java端公钥加密私钥解密，java端私钥加密公钥解密都容易做到，iOS不能私钥加密公钥解密，只能用于验签）。 问题 问题1：iOS端公钥加密的数据用Java端私钥解密。 iOS无论使用系统自带的sdk函数，用mac产生的或者使用java的jdk产生的公钥和私钥，进行加密解密自己都可以使用。不过ios加密，java解密，或者反过来就不能用了。要么是无法创建报告个-9809或-50的错误，要么解出来是乱码。ios系统函数种只有用公钥加密，私钥解密的方式。而公钥加密每次结果都不同。 MAC上生成公钥、私钥的方法，及使用 1.打开终端

I'm trying to create a text file with the contents of a string to my desktop. I'm not sure if I'm doing it right, I don't get errors but it doesn't work either... NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES); NSString *desktopDirectory=[paths objectAtIndex:0]; NSString *filename = [desktopDirectory stringByAppendingString: @"file.txt"]; [myString writeToFile:filename atomically:YES encoding: NSUTF8StringEncoding error: NULL]; megha //Method writes a string to a text file -(void) writeToTextFile{ //get the documents directory: NSArray *paths =

I read from a csv file, and want to split the long string that I get using stringWithContentsOfFile, which is a multi line string, with individual lines representing rows in the csv file. How do I do this? Dipendra You can break the string into arrays of string and then manipulate as you want. NSArray *brokenByLines=[yourString componentsSeparatedByString:@"\n"] Just in case anyone stumbles across this question like I did. This will work with any newline characters: NSCharacterSet *separator = [NSCharacterSet newlineCharacterSet]; NSArray *rows = [yourString