将NSString转换为NSData，反之亦然(Converting NSString to NSData and vice versa)

 我在尝试将NSString转换为NSData时遇到问题，反之亦然。 我正在尝试将加密的字符串存储到我的数据库中。 为此，我正在使用AES算法。 现在我正在做的是我得到加密NSData ，我将它转换为NSString使用以下内容： 
 
// Not woking
NSString *strTemp = [[NSString alloc] initWithData:encData encoding:NSUTF8StringEncoding]; 

// Working
NSString *strTemp = [[NSString alloc] initWithData:encData encoding:NSASCIIStringEncoding];
 
 为什么NSData在使用NSUTF8StringEncoding不转换。 当我尝试使用NSASCIIStringEncoding转换字符串时， NSASCIIStringEncoding ： 
 
// Not working
[strTemp dataUsingEncoding:NSASCIIStringEncoding];

// Working
[strTemp dataUsingEncoding:NSUTF8StringEncoding];
 
 为什么在将NSString转换为NSData时NSASCIIStringEncoding不起作用？ 

I am having an issue while trying to convert NSString to NSData and vice versa. I am trying to store encrypted string to my database. For that I am using AES algorithm. Now what I am doing is I get encrypted NSData and I am converting this to NSString using following:
 
// Not woking
NSString *strTemp = [[NSString alloc] initWithData:encData encoding:NSUTF8StringEncoding]; 

// Working
NSString *strTemp = [[NSString alloc] initWithData:encData encoding:NSASCIIStringEncoding];
 
Why NSData is not converting while using NSUTF8StringEncoding. Same way when I try to convert the string got by NSASCIIStringEncoding using:
 
// Not working
[strTemp dataUsingEncoding:NSASCIIStringEncoding];

// Working
[strTemp dataUsingEncoding:NSUTF8StringEncoding];
 
Why NSASCIIStringEncoding is not working while converting the NSString to NSData?

原文：https://stackoverflow.com/questions/6745720