How to determine if a write operation is successful using NSFileHandle?

Question

The method -writeData: of NSFileHandle class returns nothing. Is there any way for us to determine whether the operation is successful or not? Or I should use other way to save my data?

Yes. I want the "seekToFile", too. And this is why I use NSFileHandle Class. Or should I implement a class myself calling low-level system API like `fseek()`, `fwrite()`, etc? — Andrew Chang, Oct 11 '13 at 01:04

score 0 · Answer 1 · answered Oct 10 '13 at 07:16

0

According to writeData method Reference, this method raises an exception if the file descriptor is closed or is not valid, if the receiver represents an unconnected pipe or socket endpoint, if no free space is left on the file system, or if any other writing error occurs.

answered Oct 10 '13 at 07:16

Suryakant Sharma

3,852
1
25
47

Thanks for you reply. I add comment in my question. And that also explains why I did not use `-writeToFile:` method. – Andrew Chang Oct 11 '13 at 01:05

score 0 · Answer 2 · answered Oct 10 '13 at 07:18

You can write any standard cocoa object to a file pretty simple. This returns a BOOL value if it is sucessful or not

BOOL result = [YOUR_OBJECT writeToFile:@"absolute/file/path" atomically:YES]];

if (result)
    NSLog(@"All went well");
else
    NSLog(@"File was not saved");

How to determine if a write operation is successful using NSFileHandle?

2 Answers2