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8.8

WMQueryEndSession inside a custom class is never called

Asked by smartins in Delphi Programming

Tags: wmqueryendsession

I'm having problems receving a notification when Windows is shutting down if I setup the WMQueryEndSession procedure on a custom class. If setup inside a form it gets called just fine. Any idea what might be the problem?

WORKS:
--------------------------------
type
  TForm1 = class(TForm)
  private
    { Private declarations }
    procedure WMQueryEndSession(var Message: TMessage); message WM_QUERYENDSESSION;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMQueryEndSession(var Message: TMessage);
begin
  if MessageDlg('Close Windows ?', mtConfirmation, [mbYes,mbNo], 0) = mrNo then
    Message.Result := 0
  else
    Message.Result := 1;
end;
--------------------------------

DOESN'T WORK (the WMQueryEndSession procedure is never called):
--------------------------------
  TMonitor = class
  private
    procedure WMQueryEndSession(var Message: TMessage); message WM_QUERYENDSESSION;
  protected
  public
  end;

implementation

procedure TMonitor.WMQueryEndSession(var Message: TMessage);
begin
  if MessageDlg('Close Windows ?', mtConfirmation, [mbYes,mbNo], 0) = mrNo then
    Message.Result := 0
  else
    Message.Result := 1;
end;

On the main form:
Monitor := TMonitor.Create;
--------------------------------
[+][-]09/10/05 01:30 PM, ID: 14857229Accepted Solution

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About this solution

Zone: Delphi Programming
Tags: wmqueryendsession
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Solution Provided By: RadikalQ3
Participating Experts: 1
Solution Grade: A
 
[+][-]09/10/05 02:24 PM, ID: 14857385Author Comment

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