获取当前系统版本号

unit WinVerUtils;
{
#===============================================================================

# Name:        WinVerUtils.pas
# Author:      Aleksander Oven
# Created:     2007-02-25
# Last Change: 2007-02-25
# Version:     1.0

# Description:

All about the version of the Windows OS.
Reference: http://msdn2.microsoft.com/en-us/library/ms724451.aspx 
# Warnings and/or special considerations:

Source code in this file is free for personal and commercial use.

#===============================================================================
}
interface

type
TWindowsVersion = (
wvNotRecognized, wvWindows95, wvWindows95OSR2, wvWindows98, wvWindows98SE,
wvWindowsME, wvWindowsNT, wvWindowsNT35, wvWindowsNT40, wvWindows2000,
wvWindowsXP, wvWindowsXPSP2, wvWindowsXP64, wvWindowsServer2003,
wvWindowsVista, wvWindowsServerLonghorn
);

function GetWindowsVersion: TWindowsVersion;
function GetWindowsName: AnsiString;
function GetWindowsVersionString: AnsiString;

implementation

uses
Windows, SysUtils;

type
TOSVersionInfoExA = packed record
dwOSVersionInfoSize: DWORD;
dwMajorVersion: DWORD;
dwMinorVersion: DWORD;
dwBuildNumber: DWORD;
dwPlatformId: DWORD;
szCSDVersion: array[0..127] of AnsiChar;
wServicePackMajor: WORD;
wServicePackMinor: WORD;
wSuiteMask: WORD;
wProductType: Byte;
wReserved: Byte;
end;

const
cWindowsVersions: array [TWindowsVersion] of AnsiString = (
'Not recognized', 'Windows 95', 'Windows 95 OSR 2', 'Windows 98',
'Windows 98 Second Edition', 'Windows Millenium', 'Windows NT',
'Windows NT 3.5', 'Windows NT 4.0', 'Windows 2000', 'Windows XP',
'Windows XP Service Pack 2', 'Windows XP x64', 'Windows Server 2003',
'Windows Vista', 'Windows Server Longhorn'
);

function GetVersionExA(lpVersionInformation: Pointer): BOOL; stdcall;
external kernel32 name 'GetVersionExA';

function GetWindowsVersion: TWindowsVersion;
const
VER_NT_WORKSTATION = $01;
var
VI: TOSVersionInfoA;
VIEx: TOSVersionInfoExA;
begin
Result := wvNotRecognized;

VI.dwOSVersionInfoSize := SizeOf(TOSVersionInfoA);
if not GetVersionExA(@VI) then
Exit;

case VI.dwPlatformID of
VER_PLATFORM_WIN32_WINDOWS:
begin
case VI.dwMinorVersion of
0:
begin
if (VI.szCSDVersion[1] = 'B') then
Result := wvWindows95OSR2
else
Result := wvWindows95;
end;
10:
begin
if (VI.szCSDVersion[1] = 'A') then
Result := wvWindows98SE
else
Result := wvWindows98;
end;
90:
begin
if (VI.dwBuildNumber = $045A0BB8) then
Result := wvWindowsME;
end;
end;
end;
VER_PLATFORM_WIN32_NT:
begin
case VI.dwMajorVersion of
3: Result := wvWindowsNT35;
4: Result := wvWindowsNT40;
else
VIEx.dwOSVersionInfoSize := SizeOf(TOSVersionInfoExA);
if not GetVersionExA(@VIEx) then
VIEx.dwOSVersionInfoSize := 0;

case VI.dwMajorVersion of
5:
begin
case VI.dwMinorVersion of
0: Result := wvWindows2000;
1:
begin
if (Pos('Service Pack 2', AnsiString(VI.szCSDVersion)) > 0) then
Result := wvWindowsXPSP2
else
Result := wvWindowsXP;
end;
2:
begin
Result := wvWindowsXP64;

if (VIEx.dwOSVersionInfoSize > 0) and
(VIEx.wProductType <> VER_NT_WORKSTATION)
then
Result := wvWindowsServer2003;
end
else
Result := wvWindowsNT;
end;
end;
6:
begin
Result := wvWindowsVista;

if (VIEx.dwOSVersionInfoSize > 0) and
(VIEx.wProductType <> VER_NT_WORKSTATION)
then
Result := wvWindowsServerLonghorn;
end;
end;
end;
end;
end;
end;

function GetWindowsName: AnsiString;
begin
Result := cWindowsVersions[GetWindowsVersion];
end;

function GetWindowsVersionString: AnsiString;
var
VI: TOSVersionInfoA;
begin
VI.dwOSVersionInfoSize := SizeOf(TOSVersionInfoA);
if GetVersionExA(@VI) then
with VI do
Result := Trim(
Format(
'%d.%d build %d %s',
[dwMajorVersion, dwMinorVersion, dwBuildNumber, szCSDVersion]
)
)
else
Result := '';
end;

end.