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Inno Setup MsgBox with Three Buttons and Three Results

I am trying to create MsgBoxwith three buttons and three results, but cannot understand how I can create a third result? I currently have the following code for two buttons MsgBoxthat works fine:

if ((strExistingInstallPath <> '') and (strExistingVersion = '2.5.3')) then
begin
  if SuppressibleMsgBox('Setup has detected that ' + strMyAppName + ' ' + strExistingVersion + '.' + strExistingBuild + ' is installed.' + #13#10 + #13#10 +
    'The existing version must be removed before installing or upgrading to ' + strMyAppVersion + '.' + strMyAppBuild + '.' + #13#10 + #13#10 +
    'Would you like Setup to uninstall the existing version?',
    mbConfirmation, MB_YESNO, IDYES) = IDYES then
    begin
      Exec(GetUninstallString, '', '', SW_SHOW,
        ewWaitUntilTerminated, intResultCode);
      Result := True;
    end else
      begin
        MsgBox('The existing version must be removed first.' + #13#10 +
          'Setup is unable to continue. Setup will now exit.',
          mbError, MB_OK);
        Result := False;
      end;
end;

MB_YESNO MB_YESNOCANCEL, : "", "" "". , if MsgBox, , else if IDCANCEL then. ID, MsgBox, , if , ID, . ? , "", "" " ", /silent, . , ?

+4
2

if, . , @Sertac , case, , :

case SuppressibleMsgBox('Text', mbConfirmation, MB_YESNOCANCEL, IDYES) of
  IDYES:
  begin
    { user pressed Yes }
  end;
  IDNO:
  begin
    { user pressed No }
  end;
  IDCANCEL:
  begin
    { user pressed Cancel }
  end;
end;

if :

var
  MsgResult: Integer;
begin
  MsgResult := SuppressibleMsgBox('Text', mbConfirmation, MB_YESNOCANCEL, IDYES);

  if MsgResult = IDYES then
  begin
    { user pressed Yes }
  end
  else
  if MsgResult = IDNO then
  begin
    { user pressed No }
  end
  else
  if MsgResult = IDCANCEL then
  begin
    { user pressed Cancel }
  end;
end;
+6

, - :

var
  intMsgBoxResult: Integer;
if ((strExistingInstallPath <> '') and (strExistingVersion = '2.5.3')) then
begin
  intMsgBoxResult := SuppressibleMsgBox('Setup has detected that ' + strMyAppName + ' ' + strExistingVersion + '.' + strExistingBuild + ' is installed.' + #13#10 + #13#10 +
    'The existing version must be removed before installing or upgrading to ' + strMyAppVersion + '.' + strMyAppBuild + '.' + #13#10 + #13#10 +
    'Would you like Setup to uninstall the existing version?',
    mbConfirmation, MB_YESNO, IDIGNORE);
  if intMsgBoxResult = IDYES then
    begin
      Exec(GetUninstallString, '/silent', '', SW_SHOW,
        ewWaitUntilTerminated, intResultCode);
      Result := True;
    end;
  if intMsgBoxResult = IDNO then 
    begin
      MsgBox('The existing version must be removed first.' + #13#10 +
        'Setup is unable to continue. Setup will now exit.',
        mbError, MB_OK);
      Result := False;
    end;
  if intMsgBoxResult = IDIGNORE then
    begin
      Exec(GetUninstallString, '', '', SW_SHOW,
        ewWaitUntilTerminated, intResultCode);
      Result := True;
    end; 
end;
+1

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