I have an app that uses a lot SQL. I have a few Selects that take some time to execute. So I want to show a form (in a separate thread) that will notify the user that there is some sql going on.
So far I managed to do it in the same thread passing the SQL to the notifier form and executing it from there, but it is not the nicest solution. So I'm here to ask you to provide me with a functional code that would help me imp[rove my application.
So I need to call the notifyer for before executing the SQL and the form should float ontop of my Application in a corner until the SQL is over.
I would prefer a separate thread (just for the floating notifyer form) solution.
Can you help me?
I would offer more points for this but I'm kinda out... :)
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I'll rephrase the first part :)
you can use vcl in other thread, but you will have to call "synchronize" so that it will be accessed from main thread.
the idea is that you cannot run/access vcl from another trhead then main.
so in your case, you cannot show a form in another thread.
I hope this time is clear and correct :)
One solution I've used for these problems is that the thread that is doing the work merely passes a message into the Windows message queue for the application. This message is then picked up by the main thread and the display is shown in the main thread. When the SQL is complete then it posts another message saying that.
Define a var
gWM_gInfo: DWord;
in the man form create do
gInfo:=RegisterWindowMessa
override the main form WndProc
procedure TfrmMain.WndProc(var Msg: TMessage);
begin
end;
Sorry try that again
Define two global vars
gWM_gInfo: DWord;
gMainFormHandle: THandle;
in the man form create do
gInfo:=RegisterWindowMessa
gMainFormHandle:=Handle;
override the main form WndProc
procedure TfrmMain.WndProc(var Msg: TMessage); override;
add this code to the main form
procedure TfrmMain.WndProc(var Msg: TMessage);
begin
if Msg.Msg=gInfo then
begin
if Msg.WParam=1 then
StatusBar1.SimpleText='Run
else
StatusBar1.SimpleText=''
end
else
inherited WndProc(Msg);
end;
then in the thread thats running the Query do a
PostMessage(gMainFormHandl
ExecSQL;
PostMessage(gMainFormHandl
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
I will leave the following recommendation for this question in the Cleanup topic area:
Split between pcsentinel and ciuly
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by: ciulyPosted on 2005-10-04 at 06:18:11ID: 15013543
you cannot use vcl in another thread. vcl related will always be executed in the main thread.
what you can do is move the sql operations in another thread and leave the form in the main thread