Question

如果我将NSData转换为字符串，就像这样

NSString *someString = [NSString stringWithFormat:@"%@", hashedData];

如何将someString转换回hashedData？

例如，在以下代码中

NSString *string = @"This is a string";

NSData *data1 = [string dataUsingEncoding:NSUTF8StringEncoding];

NSLog(@"data: %@",data1);
NSString *dataString = [NSString stringWithFormat:@"%@",data1];
NSData* data2 = [dataString dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data2: %@",data2);

我得到以下输出

data1: <54686973 20697320 61207374 72696e67>
data2: <3c353436 38363937 33203230 36393733 32302036 31323037 33373420 37323639 36653637 3e>

我想要的是data2应该与data1相同。我的意思是将dataString转换回原始的hashedData。

Answer 1

替换你的代码：

NSString *string = @"This is a string";   
NSData *data1 = [string dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data: %@",data1);
NSString *dataString = [NSString stringWithUTF8String:[data1 bytes]];
NSData* data2 = [dataString dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data2: %@",data2);

<强>输出：

Demoapp [1024：22267]数据：＆lt; 54686973 20697320 61207374 72696e67＆gt; 2015-09-04 12：52：10.104 Demoapp [1024：22267] data2：＆lt; 54686973 20697320 61207374 72696e67 02＆gt;

Answer 2

你无法直接将NSData分配给NSString，你必须像这样将NSData转换为NSString

NSString *dataString = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding];

检查更新的代码

NSString *string = @"This is a string";

NSData *data1 = [string dataUsingEncoding:NSUTF8StringEncoding];

NSLog(@"data: %@",data1);
NSString *dataString = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding];
NSData* data2 = [dataString dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data2: %@",data2);

现在NSData都是相同的

Answer 3

将数据转换为字符串： -

 NSData *data ;
 NSLog(@"data is :%@",data);
 NSString *strr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
 NSLog(@"Responce is : %@",strr);

现在将字符串转换为数据： -

 NSData *dataa = [strr dataUsingEncoding:NSUTF8StringEncoding];
 NSLog(@"data is :%@",dataa);


 2015-09-04 12:43:54.502 TokenPic[2003:60b] data is :<7b227375 63636573 73223a22 31222c22 706f7374 73223a22 4576656e 74204372 65617465 64205375 63636573 7366756c 6c792e22 7d>
 2015-09-04 12:44:01.165 TokenPic[2003:60b] Responce is : {"success":"1","posts":"Event Created Successfully."}
 2015-09-04 12:44:02.801 TokenPic[2003:60b] data is :<7b227375 63636573 73223a22 31222c22 706f7374 73223a22 4576656e 74204372 65617465 64205375 63636573 7366756c 6c792e22 7d>

Answer 4

在Swift 1.2中将NSData转换为NSString：

let stringFromData = NSString(data: data, encoding: NSUTF8StringEncoding)

在Swift 1.2中将NSString转换为NSData：

let dataFromString = myString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)

将NSData作为字符串转换为NSString

4 个答案: