I need to Get Alrady installed version during minor upgrade.
i have created function CheckInstalledVersion(hMSI) which is reading value from uninstall registry of already installed productCode displayversion during minor upgrade and setting that value into MSI by using MsiSetProperty(hMSI,"INSTALLEDVERSION",szInstalledVersion); Here it's returning correct version But
Now i need to read this value into another funtion but there szInstalledVersion it's showing empty string ,it's not reading value nResult = MsiGetProperty (hMSI,"INSTALLEDVERSION", szInstalledVersion, nvBuf);
I also tried Global variable approach but still it's showing blank string only.
It seems like you are attempting to set a custom property (INSTALLEDVERSION) during a minor upgrade using MsiSetProperty, and then you want to retrieve this property in another function using MsiGetProperty, but you are facing issues with the value not being read correctly.
Here are a few things to check and consider:
Sequencing of Actions: Ensure that the CheckInstalledVersion function, where you set the INSTALLEDVERSION property, is sequenced before the action where you are trying to read the property. The sequence of actions in your MSI package is crucial.
Custom Action Type: Verify that the custom action type for both actions (setting and getting INSTALLEDVERSION) is correct. It's common to use type 51 (Set Property) for setting properties and type 19 (Property) for getting properties.
Logging: Enable MSI logging to gather more information. You can do this by running the installer from the command line with the /l*vx option. For example:
msiexec /i YourInstaller.msi /l*vx install.log Check the log file for any entries related to your custom actions and property values.
You can try suggestions provided in below KB article, this kb is to get already installed versions installdir, you can modify it for your requirement, Please try it and let us know it works or not.
