SectionSetFlags bits

I read the documentation and tried playing around with it.. but i am failing to grasps how to actually modify the bits to Select/Deselect make Read-only / Non-read only. Could anyone explain to me how these work exactly? thanks..

This will set the second section as currently enabled:

  SectionGetFlags 1 $R0
  IntOp $R0 $R0 | 0x80000000
  SectionSetFlags 1 $R0 

This will set the second section as always disabled:

  SectionSetFlags 1 0x40000000 

This will set the second section as always enabled:

  SectionSetFlags 1 0xC0000000 

This will set the second section as enabled in the first 2 install types, and currently enabled:

  SectionSetFlags 1 0x80000003 

Etc...

-Justin

Ok now i am not sure about how to test and see if a section is enabled or not.. would you use the AND operade like
SectionGetFlags 1 $R0
IntOp $R1 $R0 & 0x80000000
and then do a test like this to see if its valid or not..? or am i way off bases and totaly failing to understand how it works..

Yep you got it ...
IntOp $R1 $R0 & 0x80000000
IntCmp $R1 0 SectionNotEnabled
DetailPrint "Section is enabled"
SectionNotEnabled:

-Justin

Justin,
I think i am getting it.. I am using this as a test script.. would this be the best way to work with it.? I am using 0x00000000 to make a Selection Disabled correct method right? here is the script

Name "test"
OutFile "test.exe"
Caption "NSIS Testing Script"
ShowInstDetails show
ComponentText "Testing"
Section "crap"
   GetDLLVersion $SYSDIR\DVobSub.ax $3 $4
   GetDLLVersion "C:\Windows\System\DVobSub.ax" $1 $2
   DetailPrint "$3 $4, $1 $2"
   IntOp $0 $3 & $4
   IntOp $5 $3 | $4
   DetailPrint "$0, $5"
   IntOp $0 $1 & $2
   IntOp $5 $1 | $2
   DetailPrint "$0, $5"
   SectionEnd
Section "VobSub for DirectShow"
DetailPrint "Blah Blah" 
SectionEnd
Section "Section 3"
   DetailPrint "Blah Blah 2"
SectionEnd
Section "SubMux"
   DetailPrint "Blah Blah 3"
SectionEnd
Function .onSelChange
   ;This does the check to see if the user (de)selected the SubMux and skips rest if not enabled
   SectionGetFlags 3 $R1
   IntOp $R2 $R1 & 0x80000000
   IntCmp $R2 0 Done
   SectionGetFlags 1 $R1
   IntOp $R2 $R1 & 0x80000000
   IntCmp $R2 0 NotEnabled
      Goto Done
   NotEnabled:
      MessageBox MB_YESNO "Submux needs VobSub for DirectShow installed to function properly would you like to also install VobSub for DirectShow?" IDNO DontInstall
         SectionSetFlags 1 0x80000000
         Goto Done
      DontInstall:
         SectionSetFlags 3 0x0000000
   Done:
FunctionEnd 

thanks for all this added stuff in this release.. Love it now you can make dependances and change stuff at runtime.. ;o) Keep up the great work.