delphi中判断操作系统是否是Windows7

Delphi2007编译的时候去掉GetVersionExA(@VI)中的@

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;

function GetWindowsVersion: String; //读取操作系统版本
var
AWin32Version: Extended;
os:string;
begin
os:='Windows ';
AWin32Version := StrtoFloat(format('%d.%d' ,[Win32MajorVersion, Win32MinorVersion]));
if Win32Platform=VER_PLATFORM_WIN32s then
Result := os + '32'
else if Win32Platform=VER_PLATFORM_WIN32_WINDOWS then
begin
if AWin32Version=4.0 then
Result := os + '95'
else if AWin32Version=4.1 then
Result := os + '98'
else if AWin32Version=4.9 then
Result := os + 'Me'
else
Result := os + '9x'
end
else if Win32Platform = VER_PLATFORM_WIN32_NT then
begin
if AWin32Version=3.51 then
Result := os + 'NT 3.51'
else if AWin32Version=4.0 then
Result := os + 'NT 4.0'
else if AWin32Version=5.0 then
Result := os + '2000'
else if AWin32Version=5.1 then
Result := os + 'XP'
else if AWin32Version=5.2 then
Result := os + '2003'
else if AWin32Version=6.0 then
Result := os + 'Vista'
else if AWin32Version=6.1 then
Result := os + '7'
else
Result := os ;
end
else
Result := os + '??';
Result:=Result + ' '+GetWIndowsVersionString;
end;

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,IdHashMessageDigest,IdGlobal, IdHash;

type
  TForm1 = class(TForm)
    btn1: TButton;
    OpenSwf1: TOpenDialog;
    edt1: TEdit;
    procedure btn1Click(Sender: TObject);
  private
    function StreamToMD5(S: TFileStream): String;
    { Private declarations }
  public
    { Public declarations www.delphitop.com}
  end;

type
TMD5 = class(TIdHashMessageDigest5);

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);
var
  filesen:TFileStream;
begin
 if  OpenSwf1.Execute then
   begin
        filesen:=TFileStream.Create(OpenSwf1.FileName,fmOpenRead or fmShareExclusive);
        edt1.Text:=StreamToMD5(filesen);
        filesen.Free;
   end;
end;

 //读文件MD5值
function TForm1.StreamToMD5(S: TFileStream): String;
var
Md5Encode: TMD5;
begin
Md5Encode:= TMD5.Create;
try
    Result :=Md5Encode.HashStreamAsHex(s) ;
finally
    Md5Encode.Free;
end;
end;

end.

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