如何使用NULL字符与NSString？ [英] How to use NULL character with NSString?

问题描述

在PHP中，我可以调用 base64_encode（\x00。$ username。\x00。$ password） \ x00表示一个空字符。

In PHP, I can call base64_encode("\x00". $username. "\x00". $password) and the "\x00" represents a NULL character.

现在，在Objective-C中，我有一个函数将NSData转换为由DaveDribin创建的base64编码的NSString 。

Now, in Objective-C, I have a function that converts NSData to base64 encoded NSString created by DaveDribin.

我如何从具有NULL个字符的字符串创建数据？

How do I create data from a string that has NULL characters?

这似乎不起作用...

This doesn't seem to work...

NSData * authCode = [[NSString stringWithFormat:@"%c%@%c%@", '\0', self.username, '\0', self.password] dataUsingEncoding:NSUTF8StringEncoding];

推荐答案

像这样：

char bytes[] = "\0username\0password";
NSData * data = [NSData dataWithBytes:bytes length:sizeof(bytes)];

NSLog(@"%@", data);

输出：

2010-01-22 09:15:22.546 app[6443] <00757365 726e616d 65007061 7373776f 726400>

或从 NSString ：

char bytes[] = "\0username\0password";
NSString * string = [NSString string];
[string initWithBytes:bytes length:sizeof(bytes)];
NSData * data = [string dataUsingEncoding:NSUTF8StringEncoding];

您可以在开头，用户名/密码和结尾之间看到空字节 char [] 为空终止。

You can see the null bytes at the beginning, in between username/password and at the end - because the char[] is null terminated.

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