Winamp & Shoutcast Forums - detect has already been installed

When you install, write the version number to the registry when done installing, e.g.

( slashes "/" should be backslashes "\" - darn php tag. )

PHP Code:


		
			
WriteRegStr HKCU "Software/YourCompany/YourProduct/" "version" "version number"

( above can be in the last section, or in .onInstSuccess, or.. etc.

Then when you run the installer, check for that value, e.g.

PHP Code:


		
			
ReadRegStr $0 HKCU "Software/YourCompany/YourProduct/" "version"

The version number will then be in $0. If the key did not exist, it'll just be empty. So you can do some rudimentary things with it...

PHP Code:


		
			
StrCmp $0 "" _noPreviousInstall

IntCmp $0 current_version _sameVersion _olderVersion _newerVersion



_noPreviousInstall:

; insert code to execute here when there has been no previous installation.

goto _continue



_sameVersion:

; insert code to execute here when the old installed version is the same as the current version

goto _continue 



_olderVersion:

; insert code to execute here when the old installed version is older than the current version

goto _continue 



_newerVersion:

; insert code to execute here when the old installed version is /newer/ than the current version.

goto _continue 



_continue:

; the rest of the code to continue with