Question

I am trying to use GData ObjC library to upload videos from iPhone to Youtube.

When I try to build my project after adding the library (present here : svn checkout http://gdata-objectivec-client.googlecode.com/svn/trunk/gdata-objectivec-client-read-only) , I keep getting the error –Duplicate interface definition for class ‘GDataHTTPUploadFetcher’– in GDataServiceBase.m.

However, when I do the same in a fresh project, I don’t run into any issues at all. I have checked all the imports and project settings, they are all the same.

What should I look for, to resolve such an issue ?

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Additional Info :

(To answer one of Till’s questions in the comments, because I’m not absolutely sure about categories)

In GDataHTTPUploadFetcher.h, this is how the interface is :

@interface GDataHTTPUploadFetcher : GDataHTTPFetcher {

GDataHTTPFetcher *chunkFetcher_;
BOOL needsManualProgress_
NSURL *locationURL_;
// uploadData_ or uploadFileHandle_ may be set, but not both
NSData *uploadData_;
NSFileHandle *uploadFileHandle_;
NSInteger uploadFileHandleLength_;
NSString *uploadMIMEType_;
NSUInteger chunkSize_;
BOOL isPaused_;

.
.
.

}

+ (GDataHTTPUploadFetcher *)uploadFetcherWithRequest:(NSURLRequest *)request
                                      uploadData:(NSData *)data
                                  uploadMIMEType:(NSString *)uploadMIMEType
                                       chunkSize:(NSUInteger)chunkSize;

+ (GDataHTTPUploadFetcher *)uploadFetcherWithRequest:(NSURLRequest *)request
                                uploadFileHandle:(NSFileHandle *)fileHandle
                                  uploadMIMEType:(NSString *)uploadMIMEType
                                       chunkSize:(NSUInteger)chunkSize;

- (id)initWithRequest:(NSURLRequest *)request
       uploadData:(NSData *)data
 uploadFileHandle:(NSFileHandle *)fileHandle
   uploadMIMEType:(NSString *)uploadMIMEType
        chunkSize:(NSUInteger)chunkSize;

- (void)pauseFetching;
- (void)resumeFetchingWithDelegate:(id)delegate;
- (BOOL)isPaused;



@end

In GDataHTTPUploadFetcher.m, this is how the interface is :

@interface GDataHTTPUploadFetcher (InternalMethods)
- (void)uploadNextChunkWithOffset:(NSUInteger)offset;
- (void)uploadNextChunkWithOffset:(NSUInteger)offset
            fetcherProperties:(NSDictionary *)props;
- (void)destroyChunkFetcher;

- (void)uploadFetcher:(GDataHTTPFetcher *)fetcher
     didSendBytes:(NSInteger)bytesSent
   totalBytesSent:(NSInteger)totalBytesSent
totalBytesExpectedToSend:(NSInteger)totalBytesExpected;

- (void)reportProgressManually;

- (NSUInteger)fullUploadLength;

// private methods of the superclass
- (void)invokeSentDataCallback:(SEL)sel
                    target:(id)target
           didSendBodyData:(NSInteger)bytesWritten
         totalBytesWritten:(NSInteger)totalBytesWritten
 totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite;

- (void)invokeStatusCallback:(SEL)sel
                  target:(id)target
                  status:(NSInteger)status
                    data:(NSData *)data;

- (BOOL)invokeRetryCallback:(SEL)sel
                 target:(id)target
              willRetry:(BOOL)willRetry
                  error:(NSError *)error;
@end

In GDataServiceBase.m, this is how the interface is :

@interface GDataHTTPUploadFetcher : GDataHTTPFetcher
+ (GDataHTTPUploadFetcher *)uploadFetcherWithRequest:(NSURLRequest *)request
                                      uploadData:(NSData *)data
                                  uploadMIMEType:(NSString *)uploadMIMEType
                                       chunkSize:(NSUInteger)chunkSize;
+ (GDataHTTPUploadFetcher *)uploadFetcherWithRequest:(NSURLRequest *)request
                                uploadFileHandle:(NSFileHandle *)uploadFileHandle
                                  uploadMIMEType:(NSString *)uploadMIMEType
                                       chunkSize:(NSUInteger)chunkSize;
- (void)pauseFetching;
- (void)resumeFetchingWithDelegate:(id)delegate;
- (BOOL)isPaused;
@end

But the problem is, this code only creates problems in one of the existing projects, and not in a fresh project.

Answer 1

I had to move all my code to a new project, and then everything worked.

So apparently, I had messed up something in my project settings.

Thanks so much for all the help everyone.