Cocoa: Getting image file metadata - cocoa

Question

I am building an app that allows users to select a file and/or folder either locally or across the network and list the contents of that selection in a NSTableView after some filtering (no hidden files, only accepting .tif, .eps). The user can then select a file name from the list and then have the files metadata shown to them. At least that is what I want to happen. Right now I am getting null returned for the metadata. Here's my code:
- (void)tableViewSelectionDidChange:(NSNotification *)notif {
NSDictionary* metadata = [[NSDictionary alloc] init];
//get selected item
NSString* rowData = [fileList objectAtIndex:[tblFileList selectedRow]];
//set path to file selected
NSString* filePath = [NSString stringWithFormat:#"%#/%#", objPath, rowData];
//declare a file manager
NSFileManager* fileManager = [[NSFileManager alloc] init];
//check to see if the file exists
if ([fileManager fileExistsAtPath:filePath] == YES) {
//escape all the garbage in the string
NSString *percentEscapedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)filePath, NULL, NULL, kCFStringEncodingUTF8);
//convert path to NSURL
NSURL* filePathURL = [[NSURL alloc] initFileURLWithPath:percentEscapedString];
NSError* error;
NSLog(#"%#", [filePathURL checkResourceIsReachableAndReturnError:error]);
//declare a cg source reference
CGImageSourceRef sourceRef;
//set the cg source references to the image by passign its url path
sourceRef = CGImageSourceCreateWithURL((CFURLRef)filePathURL, NULL);
//set a dictionary with the image metadata from the source reference
metadata = (NSDictionary *)CGImageSourceCopyPropertiesAtIndex(sourceRef,0,NULL);
NSLog(#"%#", metadata);
[filePathURL release];
} else {
[self showAlert:#"I cannot find this file."];
}
[fileManager release];
}
I'm guessing the problem here is the CFURLREF in CGImageSourceCreateWithURL. Instead of NSURL should I be using something else?
Thanks
Here's the path I am passing (logged from filePathURL): file://localhost/Volumes/STORAGE%20SVR/Illustration-Wofford/Illustration%20Pickup/Archive/AL013111_IL_Communication.eps

Answer 1

I can't tell where the "localhost" part in your file URL comes from, but I think that's the culprit. A file url doesn't usually contain a "localhost" part. In your example, it should look like this:
file:///Volumes/STORAGE%20SVR/Illustration-Wofford/Illustration%20Pickup/Archive/AL013111_IL_Communication.eps
But I'm pretty sure you've figured this out by now :)
Update: I stand corrected by Mike's comment: file://localhost/... is the same thing as file:///...!