不建议使用NSString cString。有什么选择？ [英] NSString cString is Deprecated. What is the alternative?

问题描述

我还有另一个新手问题。

I've got another newbie question.

我写了一段代码，将NSString转换为NSMutableData，以模拟webService结果。

I've written a piece of code that converts a NSString to NSMutableData in order to simulate a webService result.

事实证明，不建议使用cString。你能帮我更换吗？
这是我的代码。

It turns out however that cString is deprecated. Can you help me replace it? Here's my code.

NSString *testXMLDataString = 
@"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
    etc....
"</SOAP-ENV:Envelope>";

//Replace webData Received from the web service with the test Data
NSMutableData *testXMLData = [NSMutableData dataWithBytes:[testXMLDataString cString] length:[testXMLDataString length]];
[webData setData:testXMLData];

推荐答案

1. 获取原始字节


2. 以UTF8编码获取这些字节的长度。


3. 创建 NSData 对象，使用 + dataWithBytes：length：方法。

1. Get the raw bytes from the string.
2. Get the length of those bytes in the UTF8 encoding.
3. Create the NSData object using the +dataWithBytes:length: method.

---

---

const char *rawBytes = [testXMLDataString UTF8String];
const NSUInteger length = [testXMLDataString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSAssert(length > 0, @"Couldn't convert to UTF-8");

NSMutableData *testXMLData = [NSMutableData dataWithBytes:rawBytes length:length];
[webData setData:testXMLData];

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