MsiGetProperty(); Retruns a blank value

I am trying to read the Installation directory from a Visual Studio Installer from a C++ DLL.

So i created a VS Installer and a Custom Action that calls a C++ DLL. The DLL does get called but the but the MsiGetProperty(); always returns no value.

I am really stuck for ideas here. I have been trying to get this to work for 2days and failed to figure out the correct way of doing this.

I need some help, can anyone point me in the right direction.

My end goal here is to get hold of the install directory selected by the user so I can create a scheduled task on the command line. That will run the program once a week.

Here the class in question:

Thanks for any help or ideas guys, i really am so stuck. I just don
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