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Old 08-18-2010, 07:22 PM   #1 (permalink)
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Default Métro for Blackberry ... issue with media card encryption

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I'm curious about something.

There is a cool little application, Métro, that I've been using for a long time, going back to the Windows CE and Pocket PC days.

Long story short, the app can download and store city data used by the app on the media card, or it can get the data over the network each time. I was setting it to download and store the data, and it would freeze on me everytime when I would execute the function to download a new city. I discovered that the issue is media card encryption--Turn off media card encryption, and it works. And by the way, I have device memory encryption enabled, and leave that enabled, and there's no problem with that.

But, if I download all the cities I want, then turn on encryption again, the app is able to use the downloaded city already on the card, which I guess is because the city data files are not encrypted. (The encryption seems to be done when the files are written. Any files written while encryption is off remain unencrypted. I think.)

What confuses me is I've used aftermarket apps with media card encryption enabled -- Ubertwitter comes to mind -- and never had a problem. This is the first. Morever, I figure all the encryption stuff is handled by the OS and is invisible to the apps.

Can anybody tell me what it is I don't understand?
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Last edited by aiharkness : 08-18-2010 at 07:26 PM.
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Old 08-19-2010, 04:20 AM   #2 (permalink)
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Thanks for asking the question Ira, I was going to do it myself, although probably in the developer forum.

The fact that the process is (appaently) freezing when trying to write to the card, instead of ending on an error, makes me think that the BB is trying to get some input (a confirmation or a password?) from the users but that it does not appear. Maybe the "progress screen" that is shown during the operation is blocking something?

To add a bit of technical background, the soft is using basic APIs to try and write data to the memory card, using FileConnection and OutputStream.

Last edited by nanika : 08-19-2010 at 04:25 AM.
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Old 08-22-2010, 08:25 AM   #3 (permalink)
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Developer (above) fixed problem.

If anyone is interested, the download for BlackBerry is at http://metro.nanika.net/MetroBB.php. Info is at the link in the OP.
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Old 08-23-2010, 08:01 PM   #4 (permalink)
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the link does not work.
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Old 08-23-2010, 08:41 PM   #5 (permalink)
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Quote:
Originally Posted by poiuytrez View Post
the link does not work.
You must open the download link from the blackberry using the blackberry browser. Is that the link you are talking about, or the one in the original post? If the download link, are you using the blackberry browser?

EDIT: Just tested http://metro.nanika.net/MetroBB.php and it works. As I say, that's the link to download the app. Use the BlackBerry browser.

Last edited by aiharkness : 08-23-2010 at 09:15 PM.
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