Auto-uninstall old before installing new: Difference between revisions
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ExecWait '$R0 _?=$INSTDIR' ;Do not copy the uninstaller to a temp file | ExecWait '$R0 _?=$INSTDIR' ;Do not copy the uninstaller to a temp file | ||
IfErrors no_remove_uninstaller | IfErrors no_remove_uninstaller done | ||
;You can either use Delete /REBOOTOK in the uninstaller or add some code | ;You can either use Delete /REBOOTOK in the uninstaller or add some code | ||
;here to remove the uninstaller. Use a registry key to check | ;here to remove the uninstaller. Use a registry key to check | ||
Revision as of 15:52, 19 June 2009
| Author: codehistorian (talk, contrib) |
This is a code snippet you can put into your .onInit function that will detect whether your software is already installed and, if so, allows the user to uninstall it first.
In the source below, we use the define ${PROGRAM_NAME} to be the name of the product as well as the name of the installer/uninstaller. You can either define this define or search/replace it. If you name your uninstaller or registry location differently, you should change those strings accordingly.
Function .onInit ReadRegStr $R0 HKLM \ "Software\Microsoft\Windows\CurrentVersion\Uninstall\${PROGRAM_NAME}" \ "UninstallString" StrCmp $R0 "" done MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION \ "${PROGRAM_NAME} is already installed. $\n$\nClick `OK` to remove the \ previous version or `Cancel` to cancel this upgrade." \ IDOK uninst Abort ;Run the uninstaller uninst: ClearErrors ExecWait '$R0 _?=$INSTDIR' ;Do not copy the uninstaller to a temp file IfErrors no_remove_uninstaller done ;You can either use Delete /REBOOTOK in the uninstaller or add some code ;here to remove the uninstaller. Use a registry key to check ;whether the user has chosen to uninstall. If you are using an uninstaller ;components page, make sure all sections are uninstalled. no_remove_uninstaller: done: FunctionEnd
The following variant lets the uninstaller remove itself, so the IfErrors block is not needed any more:
Exec $INSTDIR\uninst.exe ; instead of the ExecWait line
