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  1. #1
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    Feb 2011
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    Question clear previous data when replace app ?

    Hi,

    i'm currently using Qt 4.7 for Symbian to develop a Symbian app, when client launch the app, it will download some data from server, and save it at current folder.

    when i have a new version of my app, client will install it at the same folder and replace the previous app, therefore the previous version data was still there.

    is there any way to clean the previous data before client launch the app?

  2. #2
    Nokia Developer Moderator
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    Re: clear previous data when replace app ?

    you could always make an executable that is run during the uninstallation process, and which then would take care of deleting any data. Note that if the data is the private folder then it will not be deleted really. Or you could make a simple logic to determine a first-run situation, in which you could go and clean any data that was left by previous installations.

  3. #3
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    Re: clear previous data when replace app ?

    is that mean i have to make another sis or exe to intercept the installation and do the work ?

  4. #4
    Nokia Developer Moderator
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    Re: clear previous data when replace app ?

    if the data is not located in private folders, yes, then that would be one possible way on doing it. anyway, you could also implement easy ways on detecting the first run condition and do the cleaning in there.

  5. #5
    Super Contributor
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    Re: clear previous data when replace app ?

    Put a version number in your app. Store that number with the data you want to erase. On startup, if the number is different, erase the data.

  6. #6
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    Re: clear previous data when replace app ?

    Quote Originally Posted by symbianyucca View Post
    if the data is not located in private folders, yes, then that would be one possible way on doing it. anyway, you could also implement easy ways on detecting the first run condition and do the cleaning in there.
    thx for the reply, actually i'm trying to see whether it can be done right after the installation and before the app launch. Anyway, it still can be done right after the app launch which is an easy way.

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