Can I set up the iPhone app to launch when a user opens an email attachment?

Question

Is there a way to launch my application when a user clicks on an email attachment so that I can access the attached file?

What I want to do is implement backup / restore application data:

• A user sends an email with an attached data file with a special extension (I will use the new iPhone 3.0 message composer class)
• If the user loses their data, they will be able to go to their mailbox and open the last email sent with the application data file.
• Then they just click on the attached file, which causes my application to start and recover from this file

Is it technically possible to complete the last step?

thanks

Answer 1

Mobile Orchard has a great tutorial that describes how to restore an application database using custom URL handlers for a serialized SQL Lite database: Lite for paid iPhone application data migrations with custom URL handlers

(paraphrased instructions from the article)

• Setting up a special URL handler in your Info.plist project Setting up a custom URL handler http://www.mobileorchard.com/wp-content/uploads/2009/01/result.png

• In the email message, convert the database or application data to the NSData64 database and include it in the URL For example:

  [NSString stringWithFormat: @ "myapplication://localhost/importDatabase?% @", encodedStringData]

• handleOpenURL AppDelegate

AppDelegate:

#import "GTMBase64.h"

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
    if([@"/importDatabase" isEqual:[url path]]) {
        NSString *query = [url query];
        NSString *importUrlData = [GTMBase64 webSafeDecodeString:query];

        // NOTE: In practice you will want to prompt the user to confirm before you overwrite their files!
        [importUrlData writeToFile:@"/path/to/FullApplication/Documents/file" atomically:YES];
        return YES;
    }
    return NO;
}

Orchard:

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Answer 2

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http://iosdevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html

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Answer 3

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