CODEWITHSUNDEEP
delphimessagebox
Jack1995
Jack1995

Reputation: 9

Delphi : why messages block the program?

If I use delphi ShowMessage or MessageDlg when the message is shown the program wait the click in the button and I wouldn't like that the program blocks himself. I need to show a message where I write that the program is searching, but as long as the message is shown the search doesn't start.. What can I do?

Thanks, Jack

ShowMessage('Sto ricercando . . .');
if (cartellaSorgente[Length(cartellaSorgente)] <> '\') then
begin
// do the research
end;

Upvotes: 0

Views: 894

Answers (1)

David Heffernan
David Heffernan

Reputation: 612993

ShowMessage displays a modal dialog. This means that the call to ShowMessage does not return until the dialog is closed.

Your problem is that you wish to execute a long-running task without blocking the UI. The way to achieve that is to put the long-running task, the search, into a separate thread. Send messages from the search thread to the UI thread to allow the UI to inform the user of progress.

Upvotes: 5

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