How to convert NSUrl to NSString?
Solution 1
Is it possible to convert NSUrl in to NSString for video file path.
Yes. Send it an absoluteString
message.
i have try to use NSString *path = [ExportoutputURL absoluteString]; but it crash.
If you want a path, send the URL a path
message. A string representing a URL is generally not a valid path; if you want a path, ask it for one.
As for the crash, it does not mean absoluteString
is wrong. Sending absoluteString
to an NSURL object is the correct way to get an NSString object that represents the URL. The problem is somewhere else.
Error EXC_BAD_ACCESS at
NSString *path = [ExportoutputURL absoluteString];
This probably means that ExportoutputURL
points to something that is not nil
but is also not a valid object. It might have pointed to an NSURL object at some point, but it doesn't now.
My guess would be that the problem is this:
ExportoutputURL = session.outputURL;
You assign the URL to the ExportoutputURL
instance variable, but you don't retain the object or make your own copy. Therefore, you don't own this object, which means you are not keeping it alive. It may die at any time, most probably after this method (exportDidFinish:
) returns.
The crash is because you call uploadVideoFile
later, after the URL object has already died. You still have a pointer to it, but that object no longer exists, so sending a message to it—any message—causes a crash.
There are three simple solutions:
- Retain the URL object when you assign it to your instance variable.
- Make your own copy of the URL object and assign that to the instance variable.
- Declare
ExportoutputURL
as a property, with either thestrong
keyword or thecopy
keyword, and assign the object to the property, not the instance variable. That will call the property's setter, which, if you synthesize it or implement it correctly, will retain or copy the URL for you.
Either way, you will own the object, and that will keep it alive until you release it. Accordingly, you will need to release it when you are done with it (in dealloc
, if not earlier), so that you don't leak it.
This all assumes that you are not using ARC. If you are using Xcode 4.2 or later, and can require iOS 4 or later, you should migrate your project to ARC, as it makes so many things much simpler. You would not need to retain or copy this object if you were using ARC, which means that migrating to ARC now is a fourth solution (but certainly a larger-scale one).
Solution 2
Use either absolutePath
or path
as mentioned by Miek and Nepster. Expanding on their answers, the difference between lies in the prefix.
NSString* string1 = [url absoluteString]; // @"file:///Users/jackbrown/Music/song name.mp3"
NSString* string2 = [url path]; // @"/Users/jackbrown/Music/song name.mp3"`
Solution 3
NSString *path = [[NSString alloc] initWithString:[url path]]; ?
Solution 4
Use this. I think it will help you.
In Objective c
NSString *testString = testUrl.absoluteString;
In Swift
var testString : String = testUrl.absoluteString
Comments
-
RAGOpoR about 4 years
After
AVAssetExportSession
has complete export video. I have plan to garb Video Path to upload via Youtube. but[GDataUtilities MIMETypeForFileAtPath:path defaultMIMEType:@"video/mp4"];
it only acceptNSString
. Is it possible to convert NSUrl in to NSString for video file path.i have try to use
NSString *path = [ExportoutputURL absoluteString];
but it crash.Here is the Code
- (void)exportDidFinish:(AVAssetExportSession*)session { ExportoutputURL = session.outputURL; _exporting = NO; NSIndexPath *exportCellIndexPath = [NSIndexPath indexPathForRow:2 inSection:kProjectSection]; ExportCell *cell = (ExportCell*)[self.tableView cellForRowAtIndexPath:exportCellIndexPath]; cell.progressView.progress = 1.0; [cell setProgressViewHidden:YES animated:YES]; [self updateCell:cell forRowAtIndexPath:exportCellIndexPath]; ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:ExportoutputURL]) { [library writeVideoAtPathToSavedPhotosAlbum:ExportoutputURL completionBlock:^(NSURL *assetURL, NSError *error){ dispatch_async(dispatch_get_main_queue(), ^{ if (error) { NSLog(@"writeVideoToAssestsLibrary failed: %@", error); UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[error localizedDescription] message:[error localizedRecoverySuggestion] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertView show]; [alertView release]; } else { _showSavedVideoToAssestsLibrary = YES; ExportCell *cell = (ExportCell*)[self.tableView cellForRowAtIndexPath:exportCellIndexPath]; [cell setDetailTextLabelHidden:NO animated:YES]; [self updateCell:cell forRowAtIndexPath:exportCellIndexPath]; NSArray *modes = [[[NSArray alloc] initWithObjects:NSDefaultRunLoopMode, UITrackingRunLoopMode, nil] autorelease]; [self performSelector:@selector(hideCameraRollText) withObject:nil afterDelay:5.0 inModes:modes]; } }); }]; } [library release]; } - (void)uploadVideoFile { NSString *devKey = DEVELOPER_KEY; GDataServiceGoogleYouTube *service = [self youTubeService]; [service setYouTubeDeveloperKey:devKey]; NSURL *url = [GDataServiceGoogleYouTube youTubeUploadURLForUserID:kGDataServiceDefaultUser]; // load the file data NSString *path = [ExportoutputURL absoluteString];//[[NSBundle mainBundle] pathForResource:@"video_2451" ofType:@"mp4"];//[mFilePathField stringValue]; NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingAtPath:path]; NSString *filename = [path lastPathComponent]; // gather all the metadata needed for the mediaGroup NSString *titleStr = @"Upload Test";//[mTitleField stringValue]; GDataMediaTitle *title = [GDataMediaTitle textConstructWithString:titleStr]; NSString *categoryStr = @"Entertainment";//[[mCategoryPopup selectedItem] representedObject]; GDataMediaCategory *category = [GDataMediaCategory mediaCategoryWithString:categoryStr]; [category setScheme:kGDataSchemeYouTubeCategory]; NSString *descStr = @"GData Description";//[mDescriptionField stringValue]; GDataMediaDescription *desc = [GDataMediaDescription textConstructWithString:descStr]; NSString *keywordsStr = @"RAGOpoR Demo";//[mKeywordsField stringValue]; GDataMediaKeywords *keywords = [GDataMediaKeywords keywordsWithString:keywordsStr]; BOOL isPrivate = NO;//([mPrivateCheckbox state] == NSOnState); GDataYouTubeMediaGroup *mediaGroup = [GDataYouTubeMediaGroup mediaGroup]; [mediaGroup setMediaTitle:title]; [mediaGroup setMediaDescription:desc]; [mediaGroup addMediaCategory:category]; [mediaGroup setMediaKeywords:keywords]; [mediaGroup setIsPrivate:isPrivate]; NSString *mimeType = [GDataUtilities MIMETypeForFileAtPath:path defaultMIMEType:@"video/mp4"]; // create the upload entry with the mediaGroup and the file GDataEntryYouTubeUpload *entry; entry = [GDataEntryYouTubeUpload uploadEntryWithMediaGroup:mediaGroup fileHandle:fileHandle MIMEType:mimeType slug:filename]; SEL progressSel = @selector(ticket:hasDeliveredByteCount:ofTotalByteCount:); [service setServiceUploadProgressSelector:progressSel]; GDataServiceTicket *ticket; ticket = [service fetchEntryByInsertingEntry:entry forFeedURL:url delegate:self didFinishSelector:@selector(uploadTicket:finishedWithEntry:error:)]; [self setUploadTicket:ticket]; GTMHTTPUploadFetcher *uploadFetcher = (GTMHTTPUploadFetcher *)[ticket objectFetcher]; }
Error EXC_BAD_ACCESS at
NSString *path = [ExportoutputURL absoluteString];