Select a file on an iPhone

I want the user to select a file from an iP开发者_如何学编程hone and upload to an HTTP server.

Example: The GoodReader application has this feature in it.

How can this be done?

You can't get all the files stored on the phone.

As the comment from Stephen Darlington states, your app is sandboxed and can only get to the files stored inside your app.

You could register your app to be able to open PDF, txt, doc and other files that you are interested in sending to your server and then users would be able to open these documents in your app. Once the files are inside your app you could then use any number of ways to upload them.

Please read the documentation here about registering your app to understand file types:

Registering the File Types Your App Supports

The file list would just be a UITableView, probably with a custom UITableViewCell.

There are a number of options for uploading data to a web service. The built-in way would be to use NSURLConnection. There are some open source frameworks that may be able to help but I have not used them.

The best way that I've found to upload images is to use the ASIHTTPRequest API. Here is a link on the documentation on POSTING data to a server. Download ASIHTTPRequest here and these are the setup instructions.

How to select a file depends on what kind of file you're trying to select. If you're trying to upload images you should look into a UIImagePickerController and UIImagePickerControllerDelegate. If not, you'll have to create a NSFileManager to search through your application's files.

NSFileManager Class reference:

http://developer.apple.com/iphone/library/documentation/cocoa/reference/foundation/Classes/NSFileManager_Class/Reference/Reference.html

Discovering Directory Contents:

– mountedVolumeURLsIncludingResourceValuesForKeys:options:

– contentsOfDirectoryAtURL:includingPropertiesForKeys:options:error:

– contentsOfDirectoryAtPath:error:

– enumeratorAtPath:

– enumeratorAtURL:includingPropertiesForKeys:options:errorHandler:

– subpathsAtPath:

– subpathsOfDirectoryAtPath:error: