当从NSString到字节，然后回到NSString时，得到奇怪的字符 [英] Getting weird characters when going from NSString to bytes and then back to NSString

问题描述

NSString *message = @"testing";    
NSUInteger dataLength = [message lengthOfBytesUsingEncoding:NSUnicodeStringEncoding];
void *byteData = malloc( dataLength );
NSRange range = NSMakeRange(0, [message length]);
NSUInteger actualLength = 0;
NSRange remain;
BOOL result =   [message getBytes:byteData maxLength:dataLength usedLength:&actualLength encoding:NSUnicodeStringEncoding options:0 range:range remainingRange:&remain];
NSString *decodedString = [[NSString alloc] initWithBytes:byteData length:actualLength encoding:NSUnicodeStringEncoding];

我的问题是，我期望decodedString是测试，但它看起来像汉字。我认为这可能是一个问题与null终止的数据，但似乎不应该是一个问题。

My issue is that I expect decodedString to be testing, but instead it looks like chinese characters. I thought it could be an issue with null-terminated data, but it seems that that should not be an issue.

推荐答案

您可以执行以下任一操作：

You can do any one of the following:

• 使用指定显式字节顺序的编码（例如 NSUTF16BigEndianStringEncoding ， NSUTF16LittleEndianStringEncoding

通过 NSStringEncodingConversionExternalRepresentation 到中的选项：参数getBytes：maxLength：usedLength：encoding：options：range：。

Pass NSStringEncodingConversionExternalRepresentation to the options: parameter in getBytes:maxLength:usedLength:encoding:options:range:. This prepends a byte-order mark to the start of the data.

使用 NSData ，作为Elvis建议。

Use NSData, as Elvis suggested.

这些天，UTF-8在大多数情况下是首选的Unicode编码。

These days, UTF-8 is the preferred Unicode encoding in most cases.

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