check if valid license during app install (by app once running is too late)

Follow

Fabrice

February 08, 2017 19:12

(I am using Advanced installer, but should be similar when using Wix or InstallShiedl)

What is the recommended way to test if a valid license is present during app install ? this test must be before anything is really installed

For sure several have faced that. Any example ?

What i particularly want to avoid  is that the user install a newer version over/instead an old one, but then it does not validate because maintenance plan is expired (but his old version was working = prepare for the claim...)

Thx,

Fabrice

0

• Official comment

  

  Soraco Technologies February 10, 2017 15:08

  To determine if a license is already registered on a system, do the following:

  / /Assuming you are using the LicenseValidator class generated by the QLM Protect Your Application Wizard

  LicenseValidator lv = new LicenseValidator();

  string storedActivationKey = string.Empty;
  string storedComputerKey = string.Empty;

  lv.QlmLicenseObject.ReadKeys(ref storedActivationKey, ref storedComputerKey);

  // If storedActivationKey or storedComputerKey are not empty, it means a license was already registered on this computer.

  You can then call GetLatestEligibleVersion to determine if the user is eligible to the upgrade:

  lv.QlmLicenseObject.GetLatestEligibleVersion (...)

   

   

  Comment actions Permalink
• 

  Fabrice February 10, 2017 15:24

  Hi John,

  Yes this is the detailed step on the QLM level ... and thanks for that.

  Sorry for my English ; my question was more "helicopter view = wider"

   

  The problem is to do what you described, but before the new app is installed

  I see two ways:

    -#1 write a "mini-app", executed by the installer, that can run without install, that basically does what you wrote and respond to the installer

   - OR #2 installer quering the previous version (that is installed) that tests what you said

  (my view: I see #1 simplier to handle, outside of main app, but I fear that it is not possible without installing some dll & it's one more app where keys will be diseminated, and this code will be very short & simple to analyse)

  --> your opinion or experience? or is there a smarter or simplier means ? or something extsisng already ?

  F

  0

  Comment actions Permalink
• 

  Soraco Technologies February 27, 2017 15:52

   

  1. I would have the user trigger the upgrade from the application currently installed - this way you already know there's a license.

  2. If the user cannot trigger the upgrade from the application, then either options you mentioned would work.

  0

  Comment actions Permalink

Please sign in to leave a comment.