ios - 应用程序崩溃并出现异常 : -[NSConcreteMutableData _fastCharacterContents]

Question

我正在尝试与 facebook 共享数据。除了本地存储在 iPhone 内存中的图像外，我能够共享数据。但是，当我尝试使用参数@“source”共享本地存储的图像时，我的应用程序因错误“[NSConcreteMutableData _fastCharacterContents]”而终止。

为了共享本地镜像，我根据@"source"参数的要求将其转换为 NSData。

NSData *data = [NSData dataWithContentsOfURL:localUrl];

   __block ACAccount *facebookAccount = nil;

    ACAccountType *facebookAccountType = [self.accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];

    // Specify App ID and permissions
    NSDictionary *options = @{
                              ACFacebookAppIdKey: @"xxxxxxxxxxxxxx",

                              ACFacebookPermissionsKey: @[@"email"],
                              ACFacebookAudienceKey: ACFacebookAudienceEveryone
                              }; // basic read permissions

    [self.accountStore requestAccessToAccountsWithType:facebookAccountType
                                          options:options completion:^(BOOL granted, NSError *e)
     {
         if (granted) {
             // Now that you have publish permissions execute the request
             NSDictionary *options2 = @{
                                        ACFacebookAppIdKey: @"xxxxxxxxxxxxxx",
                                        ACFacebookPermissionsKey: @[@"publish_stream", @"publish_actions"],
                                        ACFacebookAudienceKey: ACFacebookAudienceFriends
                                        };
             [self.accountStore requestAccessToAccountsWithType:facebookAccountType options:options2 completion:^(BOOL granted, NSError *error) {
                 if (granted) {
                     NSArray *accounts = [self.accountStore accountsWithAccountType:facebookAccountType];

                     facebookAccount = [accounts lastObject];

                     /*NSDictionary *parameters = @{@"message": @"This is a test",
                                                  @"name": @"Sharing Tutorial",
                                                  @"caption": @"Build great social apps and get more installs.",
                                                  @"description": @"Allow your users to share stories on Facebook from your app using the iOS SDK.",
                                                  @"link": @"https://developers.facebook.com/docs/ios/share/",
                                                  @"source":data};*/
                     NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                                    @"My hat image", @"message", data, @"source", nil];

                     NSURL *feedURL = [NSURL URLWithString:@"https://graph.facebook.com/me/photos"];

                     SLRequest *feedRequest = [SLRequest
                                               requestForServiceType:SLServiceTypeFacebook
                                               requestMethod:SLRequestMethodPOST
                                               URL:feedURL
                                               parameters:parameters];
                     NSLog(@"AnythingHere?");

                     [feedRequest setAccount:facebookAccount];

                     [feedRequest performRequestWithHandler:^(NSData *responseData,
                                                              NSHTTPURLResponse *urlResponse, NSError *error)
                      {
                          // Handle response
                          NSLog(@"%@%@", error,urlResponse);

                          NSDictionary *response = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:nil];

                          NSLog(@"Facebook Response : %@",response);

                      }];



                 }
                 else {
                     NSLog(@"Access denied 2");
                     NSLog(@"%@", [error description]);
                 }
             }];
         } else {
             NSLog(@"Error: %@", [e description]);
             NSLog(@"Access denied");
         }
     }];

此错误背后的原因是什么？

Answer 1

这只是一个有根据的猜测，因为我从未使用过 Social 框架，但它太长了，无法发表评论。

据此判断answer我会说你使用的 SLRequest 是错误的。我很确定异常来自您的数据对象，它被解释为 NSString(或 NSURL)。
也许你应该使用 addMultipartData:withName:type:filename:将您的照片附加到请求中。

NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                      @"My hat image", @"message", nil];

NSURL *feedURL = [NSURL URLWithString:@"https://graph.facebook.com/me/photos"];

SLRequest *feedRequest = [SLRequest
              requestForServiceType:SLServiceTypeFacebook
              requestMethod:SLRequestMethodPOST
              URL:feedURL
              parameters:parameters];

[feedRequest addMultipartData:data
                     withName:@"source"
                         type:@"multipart/form-data"
                     filename:@"Test Image"];

与another answer 基本相同的代码