Question

I am building an application using Delphi 7. I have added one button on the main form. On that button click I want to show another form. I am trying to create a second form only if the user has clicked that button for the first time. If the user clicks that button a second time then already created form should be displayed. Does a Form object have any property through which we can directly check if it is already created or not?

Answer 1

if Assigned(Form1) then
begin
  //form is created
end;

But if your form is declared locally globally you must make sure that it is initialized to nil.