Skip Sections programatically

[jcagle]

Is it possible to skip sections if a certain condition exists? If so, could someone point me in the right direction on how to do this? Thanks much!

[Joel]

yes...use SectionSetFlags

[jcagle]

Is SetSectionFlags a built-in function or is that a function/macro that I need to put in my script?

[Joel]

Need put in...a Section, Macro or Function.

[Afrow UK]

You need to do this:
## add at top of script file
!define SF_SELECTED 1
!define SECTION_OFF 0xFFFFFFFE

Section "Section Name" Sec1
## have stuff here in your section
SectionEnd

Section "Section Name" Sec2
## have stuff here in your section
SectionEnd

Then in your functions use:
## Turn sections off
Push $R0 ;save variable
SectionGetFlags ${Sec1} $R0
IntOp $R0 $R0 & ${SECTION_OFF}
SectionSetFlags ${Sec1} $R0
Pop $R0 ;return variable


## Turn sections on
Push $R0 ;save variable
SectionGetFlags ${Sec2} $R0
IntOp $R0 $R0 & ${SF_SELECTED}
SectionSetFlags ${Sec2} $R0
Pop $R0 ;return variable

The Sec1 and Sec2 bits are the important parts. Just change those bits for the different sections.

-Stu

[jcagle]

Ok, this is what I have...Could I get someone's verification that I am doing this correctly(I think I supplied all the related code)? Also, are sections initialized to "ON" when a script runs?

!include Sections.nsh

!define MUI_CUSTOMFUNCTION_DIRECTORY_PRE DirectoryPre

Section "Section Name" Sec1
## have stuff here in your section
SectionEnd
Section "Section Name" Sec2
## have stuff here in your section
SectionEnd
Section "Section Name" Sec3
## have stuff here in your section
SectionEnd

Function DirectoryPre
push $R1
ReadRegStr $R1 HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${MUI_PRODUCT}" "UninstallString"
StrCmp $R1 "" OK
SetSectionFlag ${sec1} ${SECTION_OFF}
SetSectionFlag ${sec2} ${SECTION_OFF}
SetSectionFlag ${sec3} ${SECTION_OFF}
Abort
OK:
FunctionEnd

I REALLY appreciate everyone's help on this!!!!

[Afrow UK]

It's SectionSetFlags not SetSectionFlag.
Also, your code is wrong and it will not work.
Use the code that I showed you.

Yes, sections are on by default.

-Stu

[jcagle]

In Sections.nsh (in NSIS/include), there is the macro:
!macro SetSectionFlag SECTION BITS
Push $R0
SectionGetFlags "${SECTION}" $R0
IntOp $R0 $R0 | "${BITS}"
SectionSetFlags "${SECTION}" $R0
Pop $R0
!macroend
Can't I use that?? The only difference I see between this macro and your code, Afrow, is you have a "&" instead of "|"...which is correct?

Maybe my code should be modified to:
!insertmacro SetSectionFlag ${sec1} ${SECTION_OFF}
!insertmacro SetSectionFlag ${sec2} ${SECTION_OFF}
!insertmacro SetSectionFlag ${sec3} ${SECTION_OFF}

[Afrow UK]

That is correct.
If it doesn't work, then try replacing | with & in the macro.

-Stu

[n0On3]

Originally posted by jcagle
Is it possible to skip sections if a certain condition exists?
When I want to skip a section depending on some conditions I write a StrCmp at the beginning and place one jump label at the end of the section.

This seems eaiser to me.

[Afrow UK]

Yes, thats another way, but you could say it's cheaper and less tidy, but it still works :)

-Stu