在我的设备中写入 NSData 时出现问题 [英] Problem writing NSData in my device

问题描述

谁能解释一下为什么我的代码不起作用?

Can someone explain me why my code doesn't work?

//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];


//make a file name to write the data to using the
//documents directory:
NSString *fullFileName = [NSString stringWithFormat:@"%@/subscriptions", documentsDirectory];
[dataReply writeToFile:fullFileName atomically:NO];




NSData *getData=[[NSData alloc]initWithContentsOfFile:fullFileName];

事实上，如果我尝试

NSString *string = [[NSString alloc] initWithData:getData encoding:NSASCIIStringEncoding];

如果我加载 myData 而不将其保存到我的设备，它就可以工作！(所以我确定我的数据不为空)

while if I load myData without save it to my device it works! (So I'm sure that my data is not empty)

推荐答案

试试这个，

NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];


//make a file name to write the data to using the
//documents directory:
NSString *fullFileName = [NSString stringWithFormat:@"%@/subscriptions", documentsDirectory];
[dataReply writeToFile:fullFileName atomically:NO];


Nsdata *getData=[fullFileName dataUsingEncoding:NSUTF8StringEncoding];

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