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有时我们用NSis 打包EXE的时候需要获取操作系统的版本，我们可以参考下面的函数 调用方式: call GetWindowsVersion
Pop $R0
;获取操作系统类型
Function GetWindowsVersion
Push $R0
Push $R1
ClearErrors
ReadRegStr $R0 HKLM \
"SOFTWARE\Microsoft\Windows NT\CurrentVersion" CurrentVersion
IfErrors 0 lbl_winnt
; we are not NT
ReadRegStr $R0 HKLM \
"SOFTWARE\Microsoft\Windows\CurrentVersion" VersionNumber StrCpy $R1 $R0 1
StrCmp $R1 '4' 0 lbl_error StrCpy $R1 $R0 3 StrCmp $R1 '4.0' lbl_win32_95
StrCmp $R1 '4.9' lbl_win32_ME lbl_win32_98 lbl_win32_95:
StrCpy $R0 '95'
Goto lbl_done lbl_win32_98:
StrCpy $R0 '98'
Goto lbl_done lbl_win32_ME:
StrCpy $R0 'ME'
Goto lbl_done lbl_winnt: StrCpy $R1 $R0 1 StrCmp $R1 '3' lbl_winnt_x
StrCmp $R1 '4' lbl_winnt_x StrCpy $R1 $R0 3 StrCmp $R1 '5.0' lbl_winnt_2000
StrCmp $R1 '5.1' lbl_winnt_XP
StrCmp $R1 '5.2' lbl_winnt_2003
StrCmp $R1 '6.0' lbl_winnt_vista StrCmp $R1 '6.1' lbl_winnt_win7 lbl_error lbl_winnt_x:
StrCpy $R0 "NT $R0" 6
Goto lbl_done lbl_winnt_2000:
Strcpy $R0 '2000'
Goto lbl_done lbl_winnt_XP:
Strcpy $R0 'XP'
Goto lbl_done lbl_winnt_2003:
Strcpy $R0 '2003'
Goto lbl_done lbl_winnt_vista:
Strcpy $R0 'Vista'
Goto lbl_done lbl_winnt_win7:
Strcpy $R0 'Win7'
Goto lbl_done
lbl_error:
Strcpy $R0 ''
lbl_done:
Pop $R1
Exch $R0 FunctionEnd
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