获取指定磁盘分区的可用空间

!include "MUI2.nsh"
!include "FileFunc.nsh"

Name "获取指定磁盘分区的可用空间"
Caption "获取指定磁盘分区的可用空间"
OutFile "test.exe"
SilentInstall silent

Section
 StrCpy $R1 "H:"
 ${DriveSpace} $R1 "/D=F /S=M" $R2
 ${If} $R2 < 100
 StrCpy $R3 $R1 1
 MessageBox MB_OK "$R3盘可用空间不足 100 M，请检查！"
 ${Else}
 StrCpy $R3 $R1 1
 MessageBox MB_OK "$R3盘可用空间为 $R2 M。"
 ${EndIf}
SectionEnd