CheckSpaceFree

Author: sunjammer (talk, contrib)

Description

I wrote this example for forum user cooladn. In the end it wasn't needed but someone may find it useful. It's yet another demonstration of the usefulness of the System plugin that Brainsucker wrote for NSIS. This example checks to see if a given disk has the desired amount of free space:

The Script

OutFile "FreeSpace.exe"
!define sysGetDiskFreeSpaceEx 'kernel32::GetDiskFreeSpaceExA(t, *l, *l, *l) i'
 
; $0 - space required in kb
; $1 - path to check
; $2 - 0 = ignore quotas, 1 = obey quotas
; trashes $2
function CheckSpaceFunc
  IntCmp $2 0 ignorequota
  ; obey quota
  System::Call '${sysGetDiskFreeSpaceEx}(r1,.r2,,.)'
  goto converttokb
  ; ignore quota
  ignorequota:
  System::Call '${sysGetDiskFreeSpaceEx}(r1,.,,.r2)'
  converttokb:
  ; convert the large integer byte values into managable kb
  System::Int64Op $2 / 1024
  Pop $2
  ; check space
  System::Int64Op $2 > $0
  Pop $2
functionend
 
section -
  StrCpy $0 12345; kb u need
  StrCpy $1 'c:' ; check drive c: for space
  Call CheckSpaceFunc
  IntCmp $2 1 okay
  MessageBox MB_OK "Error: Not enough disk space"
  okay:
sectionend