Question

我正在尝试编码和解码base64数据。但是在解码base64数据时，它会返回一组十六进制值，但我无法使用NSlog显示或打印输出到原始可读字符串。下面的代码无法打印任何内容，只是空白。

有人可以帮忙吗？谢谢＆GT; ＆GT;

NSString* msgEncoded = [[NSString alloc] initWithFormat:@"Q1NNKE1DTC9TTUEgUkNWL2FkbWluQHNldGVjcy5jb20gT1JHLyBUVkIvNDNkYzNlMzQwYWQ3Yzkp:"];  
NSData* decoded = [[NSData alloc] initWithData:[self decodeBase64WithString:msgEncoded]];
NSString* plainString = [[NSString alloc]initWithData:decoded encoding:NSUTF8StringEncoding];
NSLog(@"\n Decoded string:  %@ \n", plainString );

Answer 1

NSData中有内置函数

[data base64Encoding];
[data base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];

Answer 2

如果您仍然遇到问题，请试用此库：https://github.com/l4u/NSData-Base64

像这样使用它：

#import "NSData+Base64.h"

NSData *someData  //load your data from a file, url or photo as needed
NSData *file = [NSData dataWithContentsOfFile:@"mytextfile.txt"];
NSData *photo = UIImageJPEGRepresentation(self.photo.image,1);

//encode it
NSString *base64string = [photo base64EncodedString];
NSString *base64file = [file base64EncodedString];

//decode it
NSData *back = [NSData dataFromBase64String:base64string];

Answer 3

尝试Google的GTMStringEncoding课程。你也需要GTMDefines.h。

GTMStringEncoding *coder = [GTMStringEncoding rfc4648Base64StringEncoding];
NSString *encodedBase64 = [coder encodeString:@"Mary had a little lamb"];

// will contain the original text
NSString *decodedText = [coder decodeString:encodedBase64];

要将NSData*编码为NSString*并返回NSData*，请使用encode: + decode:方法代替encodeString: + {{1 }}

作为奖励，您可以获得许多其他有用的编码，例如Base64的url-safe variant。

将base64解码的NSData转换为NSString

3 个答案: