How to detect windows 32bit or 64 bit using NSIS script? - nsis

Question

I have written nsis script for java project.I have Batch file in my project.I have written batch file for commonly windows 32bit and 64 bit.After installing i have started batch file automatically using Exec command.Its woks fine in 32bit windows.but the same time this is not worked well in 64 bit.so i suspect that before installing i should check whether windows is 32 bit or 64 bit version.please share your views how to check?

Answer 1

For future lazy googlers - A small snippet:
Include this:
!include x64.nsh
And use this if:
${If} ${RunningX64}
# 64 bit code
${Else}
# 32 bit code
${EndIf}

Answer 2

Use the RunningX64 macro in the x64.nsh header:
!include LogicLib.nsh
!include x64.nsh
Section
${If} ${RunningX64}
DetailPrint "64-bit Windows"
${Else}
DetailPrint "32-bit Windows"
${EndIf}
SectionEnd

Answer 3

Here's what I use most of the time without the need for x64.nsh
Var Bit
System::Call "kernel32::GetCurrentProcess()i.s"
System::Call "kernel32::IsWow64Process(is,*i.r0)"
StrCmpS $0 0 +3
StrCpy $Bit 64
Goto +2
StrCpy $Bit 32
Now $Bit holds either 64 or 32 which can be used like this:
${If} $Bit == 64
...64-bit code..
${Else}
..32-bit code...
${EndIf}
Or
StrCmpS $Bit 64 SixtyFour ThirtyTwo
SixtyFour:
...
Goto End
ThirtyTwo:
...
End:
I used StrCmpS as I believe it's a hair faster. Lol. Hope this helps! =)