Delphi Programming RTL Reference|By Category|Alphabetically|By Unit
function Assigned(const P): Boolean;
Determines if the pointer or procedure referenced is not nil (assigned).
P is a procedural type or a pointer variable reference. The function returns True if P is NOT nil, False otherwise;
//first one
if Assigned(Form1.Menu) then
ShowMessage('Form1 HAS menu attached');
//another one
if Assigned(DataSource1.DataSet) then
ShowMessage('DataSource1 has its DataSet');
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Pointers in Delphi
An introduction to pointer data type in Delphi. What are pointers, why, when and how to use them.
Ptr, Addr, Assert,
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