Error saving data to cache directory (iPhone)

Question

I am trying to save images using the following code:

- (void)writeData{

    if(cacheFileName==nil)
        return;
    if(cacheDirectoryPath==nil)
        return;


    if (![[NSFileManager defaultManager] fileExistsAtPath:[self filePath]]) {        

        NSData *imageData = UIImageJPEGRepresentation(self.image, 0.9);

        NSError *writeError= nil;

        BOOL didWrite =  [imageData writeToFile:[self filePath] options:NSAtomicWrite error:&writeError];

        if(writeError)
            NSLog([writeError localizedDescription]);

        if(didWrite)
            NSLog(@"image saved");
        else
            NSLog(@"image not saved");


    }
}





 - (NSString *)filePath{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); 
    NSString *cacheDirectory = [paths objectAtIndex:0]; 
    NSString *filename = [cacheDirectory stringByAppendingPathComponent:cacheDirectoryPath]; 
    filename = [filename stringByAppendingPathComponent:cacheFileName]; 
    NSLog(filename);

    return filename;

}

I get an error:

2009-06-23 16:39:19.740 XXX[33454:20b] Operation could not be completed. (Cocoa error 4.)

I looked this up and see the error has the following meaning:

 NSFileNoSuchFileError = 4,        // Attempt to do a file system operation on a non-existent file

Which doesn't make sense since the file shouldn't exist.

I have tried writing the png representation and using the convenience method:

- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)flag

I am using similar code to save plists, and they work fine. I am not sure what the problem is. Any ideas?

Answer 1

I see that you use some intermediate directory within the Cache Directory, are it/they created? If not try removing them or use

NSFileManager createDirectoryAtPath:withIntermediateDirectories:attributes:error:

to create them before