NSString cString已弃用.有什么选择？

Question

我有另一个新手问题.

我编写了一段代码,将NSString转换为NSMutableData,以模拟webService结果.

但事实证明,不推荐使用cString.你能帮我换一下吗？这是我的代码.

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];

Answer 1

1. 从字符串中获取原始字节.
2. 获取UTF8编码中这些字节的长度.
3. NSData使用该+dataWithBytes:length:方法创建对象.

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];