ViaThinkSoft CodeLib
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CodeLib → Programming aids → Delphi
{$IFDEF UNICODE}
function GetUserNameEx(NameFormat: DWORD; lpNameBuffer: LPWSTR; nSize: PULONG): DWORD;
stdcall; external 'secur32.dll' Name 'GetUserNameExW';
{$ELSE}
function GetUserNameEx(NameFormat: DWORD; lpNameBuffer: LPSTR; nSize: PULONG): DWORD;
stdcall; external 'secur32.dll' Name 'GetUserNameExA';
{$ENDIF}
function GetWindowsDisplayUserName: string;
const
cnMaxUserNameLen = 254;
EXTENDED_NAME_FORMAT_NameUnknown = 0;
EXTENDED_NAME_FORMAT_NameFullyQualifiedDN = 1;
EXTENDED_NAME_FORMAT_NameSamCompatible = 2;
EXTENDED_NAME_FORMAT_NameDisplay = 3;
EXTENDED_NAME_FORMAT_NameUniqueId = 6;
EXTENDED_NAME_FORMAT_NameCanonical = 7;
EXTENDED_NAME_FORMAT_NameUserPrincipal = 8;
EXTENDED_NAME_FORMAT_NameCanonicalEx = 9;
EXTENDED_NAME_FORMAT_NameServicePrincipal = 10;
EXTENDED_NAME_FORMAT_NameDnsDomain = 12;
EXTENDED_NAME_FORMAT_NameGivenName = 13;
EXTENDED_NAME_FORMAT_NameSurname = 14;
var
sUserName : string;
dwUserNameLen : DWord;
begin
dwUserNameLen := cnMaxUserNameLen-1;
SetLength( sUserName, cnMaxUserNameLen );
if GetUserNameEx(
EXTENDED_NAME_FORMAT_NameDisplay,
PChar( sUserName ),
@dwUserNameLen ) = 0 then
begin
Result := '';
RaiseLastOsError;
end;
// There is probably a bug in Win10/Win11 in GetUserNameExW
// When the attribute does not exist (e.g. the user has no display name),
// then GetUserNameEx!=0 (success), but nSize stays untouched, not changed to 0!!!
if dwUserNameLen = cnMaxUserNameLen-1 then dwUserNameLen := 0;
SetLength( sUserName, dwUserNameLen );
Result := sUserName;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(GetWindowsDisplayUserName);
end;Daniel Marschall
ViaThinkSoft Co-Founder
ViaThinkSoft Co-Founder