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Retrieve Mozc's installation directory from registry - #1087
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This is a preparation to switch Mozc's installation directory from %ProgramFiles(x86)%\Mozc into %ProgramFiles%\Mozc without user observable downtime (google#1086). Currently the directory %ProgramFiles(x86)%\Mozc is effectively hard coded in 'mozc_tip{32,64}.dll'. This means if older versions of 'mozc_tip{32,64}.dll' continue assuming the previous installation directory until it is unloaded or the process is restarted. To avoid such mismatch, with this commit SystemUtil::GetServerDirectory() starts dynamically retrieving Mozc's installation directory from registry by checking COM entries of 'mozc_tip64.dll'. If it fails, we fall back to the previous behavior. Note that this is the first step of the migration and we cannot go to the next step until 'mozc_tip{32,64}.dll' with this commit is deployed to users.
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Description
Currently the directory
%ProgramFiles(x86)%\Mozcis effectively hard coded inmozc_tip{32,64}.dll. This is a big challenge when we want to switch Mozc's installation directory from%ProgramFiles(x86)%\Mozcto%ProgramFiles%\Mozc.So as not to bother users during the migration, with this commit
SystemUtil::GetServerDirectory()first attempts to retrieve Mozc's installation directory from registry by checking the COM entry formozc_tip64.dll.The next step is to deploy
mozc_tip{32,64}.dllusers with this commit.Issue IDs
%ProgramFiles%\Mozcrather than%ProgramFiles(x86)%\Mozc#1086