how to get all files in pdf format can dropbox convert before i download it through the API

The API doesn't support converting file formats, but I'll be sure to pass this along as a feature request. 

By the way, have you looked at the /get_previews endpoint? Depending on the file type, that can return a PDF version of the file. Try passing your .doc files from your app to /get_previews, and let us know if the returned content suits your needs.

Documentation: https://www.dropbox.com/developers/documentation/http/documentation#files-get_preview

More on file previews for various file types on Dropbox: https://www.dropbox.com/en/help/6

so how can i pass my file the .doc file can you please give me some code example for objective-c

Are you using a particular SDK or library, or are you calling the HTTPS endpoints directly?

i am using dropbox sdk in my ios app

Do you mean the iOS Core SDK? That uses API v1, which does have an equivalent endpoint:

https://www.dropbox.com/developers-v1/core/docs#previews

Unfortunately, that's not implemented in the iOS Core SDK, and we don't have any sample code for doing it. That being the case, you would need to implement it in your app's code. 

can you please provide some same code for

https://www.dropbox.com/developers-v1/core/docs#previews

so i can get a preview.

Unfortunately I don't have any sample code for implementing this endpoint in Objective-C. If you try it and run in to any issues though, feel free to share your code and we'll offer whatever help we can.

        NSString * authorizToken = @"Bearer <Acess Token>";

        NSURL *url = [NSURL URLWithString:[[NSString stringWithFormat:@"https://content.dropboxapi.com/1/previews/auto/%@",dropboxPath ] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]  ];

        NSMutableURLRequest *request =

        [NSMutableURLRequest requestWithURL:url

                                cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData

                            timeoutInterval:10

         ];

        [request setValue:authorizToken forHTTPHeaderField:@"Authorization"];

        [request setHTTPMethod: @"GET"];

        NSError *requestError = nil;

        NSURLResponse *urlResponse = nil;

        NSData *response1 =

        [NSURLConnection sendSynchronousRequest:request

                              returningResponse:&urlResponse error:&requestError];

        [response1 writeToFile:pdfPath atomically:YES];


Error fie not found

when i do this

      [pMainDelegate.restClient searchPath:@" forKeyword:dropboxData.fileName];
it returns that file exits and in the rest client there is no method which helps me in call the https://content.dropboxapi.com/1/previews/auto

What's the value of dropboxPath? Are you sure that "<Acess Token>" is linked to the same app and account as pMainDelegate.restClient?