CODEWITHSUNDEEP
iosnsfilemanager
Don Jones
Don Jones

Reputation: 9497

Can't figure out this file behavior in IOS 4.2

Odd behavior with file behavior. Here's the thing: I'm using the phone camera to snap a picture, and internally generating a thumbnail. I'm saving those as temp files in the Documents directory.

Here's the complete code:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

UIImage *photo = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
photo = [self scaleAndRotateImage:photo];

// save photo
NSString *docsDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSLog(@"Writing to %@",docsDir);

// save photo file
NSLog(@"Saving photo as %@",[NSString stringWithFormat:@"%@/temp_photo.png",docsDir]);
[UIImagePNGRepresentation(photo) writeToFile:[NSString stringWithFormat:@"%@/temp_photo.png",docsDir] atomically:YES];

// make and save thumbnail
NSLog(@"Saving thumbnail as %@",[NSString stringWithFormat:@"%@/temp_thumb.png",docsDir]);
UIImage *thumb = [self makeThumbnail:photo];
[UIImagePNGRepresentation(thumb) writeToFile:[NSString stringWithFormat:@"%@/temp_thumb.png",docsDir] atomically:YES];

NSFileManager *manager = [NSFileManager defaultManager];    
NSError *error;
NSArray *files = [manager contentsOfDirectoryAtPath:docsDir error:&error];
NSLog(@"\n\nThere are %d files in the documents directory %@",(files.count),docsDir);

for (int i = 0; i < files.count; i++) {
    NSString *filename = [files objectAtIndex:i];
    NSLog(@"Seeing filename %@",filename);
}

// done
//[photo release];
//[thumb release];
[self dismissModalViewControllerAnimated:NO];
[delegate textInputFinished];
}

As you can see, I've put quite a bit of logging in here in an attempt to figure out my problem (which is coming up). The log output to this point is:

Writing to /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents

Saving photo as /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents/temp_photo.png

Saving thumbnail as /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents/temp_thumb.png

There are 3 files in the documents directory /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents

Seeing filename temp_photo.png

Seeing filename temp_text.txt

Seeing filename temp_thumb.png

This is absolutely as-expected. I clearly have three files on the device. Here's the very next code that operates - the code that received the textInputFinished message:

- (void)textInputFinished {

NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSError *error;

// get next filename
NSString *filename;
int i = 0;
do {
    i++;
    filename = [NSString stringWithFormat:@"%@/reminder_%d",docsDir,i];
    NSLog(@"Trying filename %@",filename);
} while ([fileManager fileExistsAtPath:[filename stringByAppendingString:@".txt"]]);

NSLog(@"New base filename is %@",filename);

NSArray *files = [fileManager contentsOfDirectoryAtPath:docsDir error:&error];
NSLog(@"There are %d files in the directory %@",(files.count),docsDir);

This is testing to get a new, non-temp, not-in-use filename. It does that - but then it says there aren't any files in the documents folder! Here's the logged output:

Trying filename /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents/reminder_1

New base filename is /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents/reminder_1

There are 0 files in the directory /var/mobile/Applications/77D792DC-A224-4A47-8A4C-BB7C557626F3/Documents

What the heck? Where did the three files go?

Upvotes: 0

Views: 525

Answers (2)

v01d
v01d

Reputation: 1566

I wonder if getting the documents directory like this would make any difference:

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

Upvotes: 1

Matthew Frederick
Matthew Frederick

Reputation: 22305

This will seem like a strange answer, but since I've recently had some peculiar image availability issues with the UIImagePickerController, try this: immediately after the picker's delegate call, dismiss and release it:

- (void)imagePickerController:(UIImagePickerController *)picker 
                      didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissModalViewControllerAnimated:NO];
    [picker release];

Then move on to the rest of your code. For reasons unknown to me, the contents of info are not actually available until after the release.

If this turns out to be your solution, I still wouldn't understand why the files would seem to exist and then vanish. Still, well worth a shot.

Upvotes: 1

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