在 Objective c 中将 NSData 转换为 NSString [英] Converting NSData to NSString in Objective c

问题描述

我想将 NSData 转换为 NSString ..这样做的最佳方法是什么?

I want to convert NSData to NSString..What is the best way to do this?

我正在使用此代码，但最终字符串返回空

I am using this code but the final string returns null

NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",str);

当我看到控制台时，它会打印 null.

When I see console It will print null.

推荐答案

NSString 的文档说

https://developer.apple.com/documentation/foundation/nsstring/1416374-initwithdata

返回值一个 NSString 对象通过转换字节初始化使用将数据转换为 Unicode 字符编码.返回的对象可能是与原始接收器不同.如果初始化，则返回 nil由于某种原因失败(例如，如果数据不代表有效数据编码).

Return Value An NSString object initialized by converting the bytes in data into Unicode characters using encoding. The returned object may be different from the original receiver. Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding).

您应该尝试其他编码以检查它是否可以解决您的问题

You should try other encoding to check if it solves your problem

 // The following constants are provided by NSString as possible string encodings.
enum {
   NSASCIIStringEncoding = 1,
   NSNEXTSTEPStringEncoding = 2,
   NSJapaneseEUCStringEncoding = 3,
   NSUTF8StringEncoding = 4,
   NSISOLatin1StringEncoding = 5,
   NSSymbolStringEncoding = 6,
   NSNonLossyASCIIStringEncoding = 7,
   NSShiftJISStringEncoding = 8,
   NSISOLatin2StringEncoding = 9,
   NSUnicodeStringEncoding = 10,
   NSWindowsCP1251StringEncoding = 11,
   NSWindowsCP1252StringEncoding = 12,
   NSWindowsCP1253StringEncoding = 13,
   NSWindowsCP1254StringEncoding = 14,
   NSWindowsCP1250StringEncoding = 15,
   NSISO2022JPStringEncoding = 21,
   NSMacOSRomanStringEncoding = 30,
   NSUTF16StringEncoding = NSUnicodeStringEncoding,
   NSUTF16BigEndianStringEncoding = 0x90000100,
   NSUTF16LittleEndianStringEncoding = 0x94000100,
   NSUTF32StringEncoding = 0x8c000100,
   NSUTF32BigEndianStringEncoding = 0x98000100,
   NSUTF32LittleEndianStringEncoding = 0x9c000100,
   NSProprietaryStringEncoding = 65536
};

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