upload Video to Facebook using iOS6 Social Framework - facebook

Question

I want to publish a video file to facebook. Previously I used the Facebook iOS SDK3.0 and it works. However, for iOS6 Social Framework, there is problem.
__block ACAccount * facebookAccount;
ACAccountStore* accountStore = [[ACAccountStore alloc] init];
NSDictionary *options = #{
ACFacebookAppIdKey: #"MY APP ID",
ACFacebookPermissionsKey: #[#"publish_actions", ],
#"ACFacebookAudienceKey": ACFacebookAudienceFriends
};
ACAccountType *facebookAccountType = [accountStore
accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
[accountStore requestAccessToAccountsWithType:facebookAccountType options:options completion:^(BOOL granted, NSError *error) {
if (granted) {
NSArray *accounts = [accountStore
accountsWithAccountType:facebookAccountType];
facebookAccount = [accounts lastObject];
NSLog(#"access to facebook account ok %#", facebookAccount.username);
NSData *videoData = [NSData dataWithContentsOfFile:[self videoFileFullPath]];
NSLog(#"video size = %d", [videoData length]);
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
videoData, #"video.mov",
#"video/quicktime", #"contentType" ,
#"Video title", #"title",
#"Video description", #"description",nil];
NSURL *requestURL = [NSURL URLWithString:#"https://graph.facebook.com/me/videos"];
SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook
requestMethod:SLRequestMethodPOST
URL:requestURL
parameters:params];
request.account = facebookAccount;
[request performRequestWithHandler:^(NSData *data, NSHTTPURLResponse *response,NSError * error){
NSLog(#"response = %#", response);
NSLog(#"error = %#", [error localizedDescription]);
}];
} else {
NSLog(#"access to facebook is not granted");
// extra handling here if necesary
}
}];
Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[NSConcreteData
_fastCharacterContents]: unrecognized selector sent to instance 0x2097ead0'

Answer 1

Here is my research:
First, the video data cannot be part of the parameter list, since it will render the SLRequest invalid and that is the crash you are experiencing.
The video data must go in the multi part section of the request.
Now,there is a need to associate the parameters with the multipart data and that is the tricky part. So it is necessary to use the source attribute to make that link.
Source requires a URL in a string format set it in the parameters and set the same value in the filename field in the multipart request.
That should do it.
NSURL *url = [NSURL URLWithString:#"https://graph.facebook.com/me/videos"];
NSURL *videoPathURL = [[NSURL alloc]initFileURLWithPath:videoPath isDirectory:NO];
NSData *videoData = [NSData dataWithContentsOfFile:videoPath];
NSString *status = #"One step closer.";
NSDictionary *params = #{#"title":status, #"description":status};
SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook
requestMethod:SLRequestMethodPOST
URL:url
parameters:params];
[request addMultipartData:videoData
withName:#"source"
type:#"video/quicktime"
filename:[videoPathURL absoluteString]];

Answer 2

I'm working the same issue. I think your error is from ARC and NSData *videoData gets deleted before the return from performRequestWithHandler.