Detect selected options and build list?

I'm trying to show the user what paths things will be installed in, before the actual installation takes place

1) Is there currently already a way to do this? If not,
2) How do I detect what options are selected? I can't read the components section out of the registry, since they haven't been written yet. Currently, I've got a custom page set up, and use the MUI_INSTALLOPTIONS_WRITE macro to modify a label field. But then I realized the list of paths/items needs to be dynamic, so the static list I set up wouldn't work.

How do I detect what the user (left) selected and then build the list? This is what I did (which is not valid) before I realized it needs to be dynamic:

    !insertmacro MUI_INSTALLOPTIONS_WRITE "reviewdirs.ini" "Field 1" "State" "$INSTDIR\Cactid\r\n\

                                                                              $INSTDIR\Cygwin\r\n\

                                                                              $INSTDIR\MySQL\r\n\

                                                                              $INSTDIR\Net-SNMP\r\n\

                                                                              $INSTDIR\PHP\r\n\

                                                                              $INSTDIR\RRDTool\r\n\

                                                                              $INSTDIR\USR\r\n\

                                                                              $IISDIR\Cacti"

I suppose you want to detect the selected components, right ?

There is a useful macro you can use. Have a look at the end of sections.nsh in $NSISDIR\include\. In the examples directory you will find one-section.nsi that show general usage.

Use this and append your paths to that string you will write into your INI file. For better understanding see this example from NSIS-Wiki:


For your future use of conditional logic (If, else, while, case) I would really recommend the usage of LogicLib.nsh. See Include-Dir as well. Good luck.

excerpt from file sections.nsh:
; Check if one or more bits in section's flags are set
; If they are, jump to JUMPIFSET
; If not, jump to JUMPIFNOTSET

!macro SectionFlagIsSet SECTION BITS JUMPIFSET JUMPIFNOTSET
Push $R0
SectionGetFlags "${SECTION}" $R0
IntOp $R0 $R0 & "${BITS}"
IntCmp $R0 "${BITS}" +3
Pop $R0
StrCmp "" "${JUMPIFNOTSET}" +3 "${JUMPIFNOTSET}"
Pop $R0
Goto "${JUMPIFSET}"
!macroend

Well I've got something set up, which properly displays what I want -- only if all sections are selected. If I de-select a section, either reveiewdirs.ini displays blank text or it displays all the options, which is not correct.

What am I doing wrong?

Function ReviewDirs

    !insertmacro MUI_HEADER_TEXT "Review Installation Locations" "Review the folders in which to install Cacti"

        

        StrCpy $R5 ""

        !insertmacro SectionFlagIsSet Cacti ${SF_SELECTED} set1 nset1

set1:   StrCpy $R5 "$IISDIR\Cacti\r\n"

nset1:  !insertmacro SectionFlagIsSet Cactid ${SF_SELECTED} set2 nset2

set2:   StrCpy $R5 "$R5$INSTDIR\Cactid\r\n"

nset2:  !insertmacro SectionFlagIsSet Cygwin ${SF_SELECTED} set3 nset3

set3:   StrCpy $R5 "$R5$INSTDIR\Cygwin\r\n"

nset3:  !insertmacro SectionFlagIsSet MySQL ${SF_SELECTED} set4 nset4

set4:   StrCpy $R5 "$R5$INSTDIR\MySQL\r\n"

nset4:  !insertmacro SectionFlagIsSet Net-SNMP ${SF_SELECTED} set5 nset5

set5:   StrCpy $R5 "$R5$INSTDIR\Net-SNMP\r\n"

nset5:  !insertmacro SectionFlagIsSet PHP ${SF_SELECTED} set6 nset6

set6:   StrCpy $R5 "$R5$INSTDIR\PHP\r\n"

nset6:  !insertmacro SectionFlagIsSet RRDTool ${SF_SELECTED} set7 nset7

set7:   StrCpy $R5 "$R5$INSTDIR\RRDTool\r\n"

nset7:  !insertmacro SectionFlagIsSet USR ${SF_SELECTED} set8 nset8

set8:   StrCpy $R5 "$R5$INSTDIR\USR\r\n"

nset8:  !insertmacro SectionFlagIsSet GetIF ${SF_SELECTED} set9 nset9

set9:   StrCpy $R5 "$R5$PROGRAMFILES\GetIF\r\n"

nset9:  !insertmacro SectionFlagIsSet "MySQL Administrator" ${SF_SELECTED} set10 nset10

set10:   StrCpy $R5 "$R5$PROGRAMFILES\MySQL\MySQL Administrator 1.1\r\n"

nset10:  



    !insertmacro MUI_INSTALLOPTIONS_WRITE "reviewdirs.ini" "Field 1" "State" "$R5"

    !insertmacro MUI_INSTALLOPTIONS_DISPLAY "reviewdirs.ini"      

FunctionEnd

Figured it out.. I wasn't using the actual section_index_output name. Instead I was using the section name.

The description and/or example for SectionFlagIsSet really should be more specific on what field it needs.