問題在我的設備中寫入NSData

Question

有人可以解釋我爲什麼我的代碼不起作用嗎？

//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]; 

INFACT如果我嘗試

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

而如果我加載的myData沒有將它保存到我的設備它的工作原理！ （所以我敢肯定，我的數據是不爲空）

Answer 1

試試這個，

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];