VerifyVersionInfo liefert immer False

[Luckie]

Ich habe die API-Funktion VerifyVersionInfo

Delphi-Quellcode:

type
  DWORDLONG = Int64;

type
  POSVersionInfoEx = ^TOSVersionInfoEx;
  TOSVersionInfoEx = 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
  VER_EQUAL         = 1; // The current value must be equal to the specified value.
  VER_GREATER       = 2; // The current value must be greater than the specified value.
  VER_GREATER_EQUAL = 3; // The current value must be greater than or equal to the specified value.
  VER_LESS          = 4; // The current value must be less than the specified value.
  VER_LESS_EQUAL    = 5; // The current value must be less than or equal to the specified value.

  VER_AND           = 6; // All product suites specified in the wSuiteMask member must be present in the current system.
  VER_OR            = 7; // At least one of the specified product suites must be present in the current system.

  VER_BUILDNUMBER   = $0000004; // dwBuildNumber
  VER_MAJORVERSION  = $0000002; // dwMajorVersion If you are testing the major version, you must also test
                              // the minor version and the service pack version.
  VER_MINORVERSION  = $0000001; // dwMinorVersion
  VER_PLATFORMID    = $0000008; // dwPlatformId
  VER_SERVICEPACKMAJOR = $0000020; // wServicePackMajor
  VER_SERVICEPACKMINOR = $0000010; // wServicePackMinor
  VER_SUITENAME     = $0000040; // wSuiteMask
  VER_PRODUCT_TYPE  = $0000080; // wProductType

function VerifyVersionInfoW(var VersionInfo: TOSVersionInfoEx; TypeMask: DWORD; Conditionalmask: DWORDLONG): BOOL;
  stdcall; external 'kernel32.dll';
function VerSetConditionMask(dwlConditionMask: LONGLONG; TypeBitMask: DWORD; ConditionMask: Byte): LONGLONG; stdcall;
  external 'kernel32.dll';

function IsWinXPOrLater: BOOL;
var
  osvi              : TOSVersionInfoEx;
  ConditionMask     : DWORD;
  op                : Integer;
begin
  ConditionMask := 0;
  op := VER_GREATER_EQUAL;

  ZeroMemory(@osvi, sizeof(TOSVersionInfoEx));
  osvi.dwOSVersionInfoSize := sizeof(TOSVersioNinfoEx);
  osvi.dwMajorVersion := 5;
  osvi.dwMinorVersion := 1;
  osvi.wServicePackMajor := 2;
  osvi.wServicePackMinor := 0;

  VerSetConditionMask(ConditionMask, VER_MAJORVERSION, op);
  VerSetConditionMask(ConditionMask, VER_MINORVERSION, op);
  VerSetConditionMask(ConditionMask, VER_SERVICEPACKMAJOR, op);
  VerSetConditionMask(ConditionMask, VER_SERVICEPACKMINOR, op);

  result := VerifyVersionInfoW(osvi, VER_MAJORVERSION or VER_MINORVERSION or VER_SERVICEPACKMAJOR or
    VER_SERVICEPACKMINOR, ConditionMask);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  res : BOOL;
begin
  res := IsWinXPOrLater;
  if res then
    ShowMessage('XP SP1 oder höher')
  else
    ShowMessage('Nicht Win XP SP1 oder höher');
end;

Aber die liefert mir immer False zurück, obwohl ich Windows XP SP2 habe, wo sie eigentlich True liefern sollte. Woran liegt das?