NSIS脚本学习：如何检测并卸载已有软件版本
Var UNINSTALL_PROG
Var OLD_VER
Var OLD_PATH
Function .onInit
ClearErrors
ReadRegStr $UNINSTALL_PROG ${PRODUCT_UNINST_ROOT_KEY} ${PRODUCT_UNINST_KEY} "UninstallString"
IfErrors done
ReadRegStr $OLD_VER ${PRODUCT_UNINST_ROOT_KEY} ${PRODUCT_UNINST_KEY} "DisplayVersion"
MessageBox MB_YESNOCANCEL|MB_ICONQUESTION \
"检测到本机已经安装了 ${PRODUCT_NAME} $OLD_VER。\
$\n$\n是否先卸载已安装的版本？" \
/SD IDYES \
IDYES uninstall \
IDNO done
Abort
uninstall:
StrCpy $OLD_PATH $UNINSTALL_PROG -10
ExecWait '"$UNINSTALL_PROG" /S _?=$OLD_PATH' $0
DetailPrint " returned $0"
Delete "$UNINSTALL_PROG"
RMDir $OLD_PATH
done:
FunctionEnd