On 6/18/2018 6:15 AM, Shailendra Kumar Verma wrote:
> I am trying to find out through registry checking whether or not Apache 
> Tomcat 9.0.8 is already installed or not. If the below registry is not there, 
> then my program installs Apache Tomcat 9.0.8 installer otherwise it moves on 
> to other installation and completes. It's kind of prerequisite check program.
> HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\Tomcat\9.0\Tomcat9
> However, everytime program just proceeds to install Tomcat despite it is 
> already installed? Am I checking wrong registry?

Do you think it could be possible that the tomcat installer and your
checking program are different architectures?  A 32-bit Windows program
will see a different registry location for HKEY_LOCAL_MACHINE\SOFTWARE
than a 64-bit program will.  A 64-bit program can see the 32-bit
location as HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node.



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