installer - Detecting the presence of a directory at install time -

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in wix directorysearch can used determine if specific directory exists on target computer. don't understand if there's consistent way determine directory does not exist.

for example:

<property id="installdir" secure="yes">   <registrysearch id='installdir' type='directory'     root='hklm' key='software\company\product\install' name='installpath'/> </property> <property id='is_installed' secure='yes'>   <directorysearch id='isinstalled' path='[installdir]' /> </property>

when both registry key , directory exist, is_installed property set path returned directorysearch.

when directory not exist, is_installed appears set "c:\".

is condition like:

<condition>not (is_installed = "c:\")</condition>

a reliable way detect directory found? there better way?

answer: here wix code based on mrnxs answer accepted

<property id="product_is_installed" secure="yes">   <registrysearch id='registrysearch1' type='directory'     root='hklm' key='software\company\product\version\install' name='path'>     <directorysearch id='directorysearch1' path='[product_is_installed]'/>   </registrysearch> </property>  <customaction id='set_installdir'               property='installdir'               value='[product_is_installed]'/>  <installexecutesequence>   <custom action='set_installdir' after='appsearch'></custom> </installexecutesequence>

usually happens when property used property-based folder. in case costfinalize action automatically sets property valid path (for example "c:\") folder can used windows installer.

since path generated automatically, cannot sure "c:\" on client machines, shouldn't use value in condition. instead, can try this:

  • use custom property folder
  • use type 51 custom action (property set formatted text) set property valid default path (for example "[programfilesfolder]mycompany\myproduct")
  • use property search
  • use type 51 custom action set folder property search property

for example, if search is_installed folder can use is_installed_path. is_installed_path can set default path , after appsearch action can set is_installed if search found something.

this way can use conditioning:

is_installed

or

not is_installed

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