Falsche Speicherbereiche

[Luckie]

Ich stehe vor einem Rätsel. Mit der API NetUserSetInfo versuche ich Details für einen Benutzer Account zu setzen. NetUserSetInfo erwartet unter anderem folgende Struktur:

Delphi-Quellcode:

type
  TUserInfo3 = record
    usri3_name: LPWSTR;
    usri3_password: LPWSTR;
    usri3_password_age: DWORD;
    usri3_priv: DWORD;
    usri3_home_dir: LPWSTR;
    usri3_comment: LPWSTR;
    usri3_flags: DWORD;
    usri3_script_path: LPWSTR;
    usri3_auth_flags: DWORD;
    usri3_full_name: LPWSTR;
    usri3_usr_comment: LPWSTR;
    usri3_parms: LPWSTR;
    usri3_workstations: LPWSTR;
    usri3_last_logon: DWORD;
    usri3_last_logoff: DWORD;
    usri3_acct_expires: DWORD;
    usri3_max_storage: DWORD;
    usri3_units_per_week: DWORD;
    usri3_logon_hours: PBYTE;
    usri3_bad_pw_count: DWORD;
    usri3_num_logons: DWORD;
    usri3_logon_server: LPWSTR;
    usri3_country_code: DWORD;
    usri3_code_page: DWORD;
    usri3_user_id: DWORD;
    usri3_primary_group_id: DWORD;
    usri3_profile: LPWSTR;
    usri3_home_dir_drive: LPWSTR;
    usri3_password_expired: DWORD;
  end;
  PUserInfo3 = ^TUserInfo3;

Diese fülle ich wie folgt:

Delphi-Quellcode:

function SetDetails: TUserInfo3;
begin
  ZeroMemory(@result, sizeof(result));
  result.usri3_name := PWideChar(WideString(GetText(ID_EDT_USER)));
  result.usri3_full_name := PWideChar(WideString(GetText(ID_EDT_FULLNAME)));
  result.usri3_comment := PWideChar(WideString(GetText(ID_EDT_DESCRIPTION)));
  result.usri3_home_dir := PWideChar(WideString(GetText(ID_EDT_HOMEDIR)));
  result.usri3_script_path :=
    PWideChar(WideString(GetText(ID_EDT_SCRIPT_PATH)));
  if GetCheck(ID_CHK_MUST_CHANGE_PW) then
    result.usri3_password_expired := 1
  else
    result.usri3_password_expired := 0;
  if GetCheck(ID_CHK_CANT_CHANGE_PW) then
    result.usri3_flags := result.usri3_flags or UF_PASSWD_CANT_CHANGE;
  if GetCheck(ID_CHK_PW_DONT_EXPIRE) then
    result.usri3_flags := result.usri3_flags or UF_DONT_EXPIRE_PASSWD;
  if GetCheck(ID_CHK_ACCOUNT_DISABLED) then
    result.usri3_flags := result.usri3_flags or UF_ACCOUNTDISABLE;
end;

Dann die eigentliche Funktion:

Delphi-Quellcode:

function SetUserInfo(Server, User: string; UserInfo: TUserInfo3):
  NET_API_STATUS;
var
  ui3: Pointer;
begin
  ui3 := nil;
  result := NERR_BASE;
  if User <> '' then
  begin
    if NetUserGetInfo(PWideChar(WideString(Server)),
      PWideChar(WideString(User)), 3, ui3) = NERR_SUCCESS then
    begin
      PUserInfo3(ui3)^.usri3_name := UserInfo.usri3_name;
      PUserInfo3(ui3)^.usri3_full_name := UserInfo.usri3_full_name;
      PUserInfo3(ui3)^.usri3_password := UserInfo.usri3_password;
      PUserInfo3(ui3)^.usri3_home_dir := UserInfo.usri3_home_dir;
      PUserInfo3(ui3)^.usri3_comment := UserInfo.usri3_comment;
      PUserInfo3(ui3)^.usri3_usr_comment := UserInfo.usri3_comment;
      PUserInfo3(ui3)^.usri3_priv := UserInfo.usri3_priv;
      PUserInfo3(ui3)^.usri3_script_path := UserInfo.usri3_script_path;
      PUserInfo3(ui3)^.usri3_auth_flags := UserInfo.usri3_auth_flags;
      PUserInfo3(ui3)^.usri3_parms := UserInfo.usri3_parms;
      PUserInfo3(ui3)^.usri3_workstations := UserInfo.usri3_workstations;
      PUserInfo3(ui3)^.usri3_acct_expires := UserInfo.usri3_acct_expires;
      PUserInfo3(ui3)^.usri3_max_storage := UserInfo.usri3_max_storage;
      PUserInfo3(ui3)^.usri3_home_dir_drive := UserInfo.usri3_home_dir_drive;
      PUserInfo3(ui3)^.usri3_profile := UserInfo.usri3_profile;
      PUserInfo3(ui3)^.usri3_password_expired := UserInfo.usri3_password_expired;
      PUserInfo3(ui3)^.usri3_flags := UserInfo.usri3_flags;
      result := NetUserSetInfo(PWideChar(WideString(Server)),
        PWideChar(WideString(User)), 3, ui3, nil);
    end;
  end;
end;

Es kommt alles richtig an. Stoppe ich hier: PUserInfo3(ui3)^.usri3_name := UserInfo.usri3_name; und schaue mir die Werte der felder der Struktur an, stimmen sie alle. Aber so bald der full_name zugewiesen wurde, stimmen die Werte der anderen Felder nicht mehr. Teilweise steht Schrott drinne teilweise sachen im Klartext, die irgendwo anders im Programm auftauchen, wie der Computername zum Beispiel.

Ich habe keinen blassen Schimmer, was da passiert und warum.