rutsche
18th January 2008 05:27 UTC

Size of int in nsis
  Hi,

is it safe to assume that an int in nsis has always the size of 4 bytes? or is this platform dependet?

I have an NSDialog with a multiselection Listbox which I query in the following way:
(LB_GETSELITEMS places an array of ints at the given address)

#get maximum of selected items

>SendMessage $ListBox ${LB_GETCOUNT} $0 $0 $itemCount


>#allocate memory for $itemCount integers

>IntOp $0 $itemCount * 4

System::Alloc $0

Pop $address


>#place indices of selected items in the allocated memory

>SendMessage $ListBox ${LB_GETSELITEMS} $itemCount $address $selItemCount

    

>${For} $R1 1 $selItemCount

    

    #get current index

   System::Call "*$address(i .r1)"

   MessageBox MB_OK "$1"

        

    #move to next index

   IntOp $address $address + 4


>${Next}


>System::Free $address 

>

I wonder if the addition of 4 to the current address will always give the correct result, even on a 64bit os for example?

kichik
18th January 2008 10:34 UTC

Integers in NSIS are currently treated as 32-bit. It's possible that a switch to x64 would cause them to be treated as 64-bit. But for now, it's 32-bit. If you want, the System plug-in has System::Int64Op.