"The operation couldn’t be completed. (Cocoa error 512.)" - iphone

Question

I have this code, which should be working perfectly, but I can't udnerstand why it isn't:
+(NSString *)writeImageToFile:(UIImage *)image {
NSData *fullImageData = UIImageJPEGRepresentation(image, 1.0f);
NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents/Images/"];
NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL isDirectory = NO;
BOOL directoryExists = [fileManager fileExistsAtPath:path isDirectory:&isDirectory];
if (directoryExists) {
NSLog(#"isDirectory: %d", isDirectory);
} else {
NSError *error = nil;
BOOL success = [fileManager createDirectoryAtPath:path withIntermediateDirectories:NO attributes:nil error:&error];
if (!success) {
NSLog(#"Failed to create directory with error: %#", [error description]);
}
}
NSString *name = [NSString stringWithFormat:#"%#.jpg", [JEntry generateUuidString]];
NSString *filePath = [path stringByAppendingPathComponent:name];
NSError *error = nil;
BOOL success = [fullImageData writeToFile:filePath options:NSDataWritingAtomic error:&error];
if (!success) {
NSLog(#"Failed to write to file with error: %#", [error description]);
}
return filePath;
}
It passed the directoryExists without an error, but when it gets to writeToFile, it gives me this error:
Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn’t be completed. (Cocoa error 512.)" UserInfo=0x5634ee0 {NSFilePath=/var/mobile/Applications/5E25F369-9E05-4345-A0A2-381EDB3321B8/Documents/Images/18DAE0BD-6CB4-4244-8ED1-9031393F6DAC.jpg, NSUnderlyingError=0x5625010 "The operation couldn’t be completed. Not a directory"}
Any ideas why this might be?

Answer 1

I was able to reproduce your error when writing a file first in the path #"Documents/Images/", then trying to write the image using your code.
I think there are two possible scenarios for this:
1) You created that file by mistake at a previous execution of your app. This will be solved if you reset the simulator using the menu: iOS Simulator > Reset Contents and Settings, and uninstalling the app from your device: Long press > click on the x symbol.
2) There is some code somewhere else in your app that creates this file. If this is the case, you should find this code and remove it.

Answer 2

From FoundationErrors.h:
NSFileWriteUnknownError = 512
Try using withIntermediateDirectories:YES.

Answer 3

In my case a period '.' in the directory name (e.g. ~/Documents/someDir.dir/somefile) was the cause of the problem. I removed the offending character and the error disappeared.