Difference between revisions of "Testing, if form exists"
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| − | if MyForm <> nil then MyForm.Show | + | if (MyForm <> nil) then MyForm.Show |
else | else | ||
begin | begin | ||
Revision as of 18:45, 23 November 2013
Sometimes a form may be launched from several places in a program. If it already exists, it only needs to be brought to the front. If not, it needs to be created.
This method is only needed if the form is not auto created. (It will be listed under Project|Project Options|Forms|Available forms.)
The easiest way is:
if (MyForm <> nil) then MyForm.Show
else
begin
MyForm := TMyForm.Create(Application);
MyForm.Show;
end;Use CloseAction := caFree in the form's OnClose event.
This method is taken from forum discussions.
