{
GetTextLen, GetTextBuf, Text example
This example requires two edit boxes and a button.
This example copies the text in an edit box into a null-terminated string, and puts this string in another edit box when the user clicks the button on the form.
} 
procedure TForm1.Button1Click(Sender: TObject);
var
  Buffer: PChar;
  Size: Byte;
begin
  Size := Edit1.GetTextLen;       {Get length of string in Edit1}
  Inc(Size);                      {Add room for null character}
  GetMem(Buffer, Size);           {Creates Buffer dynamic variable}
  Edit1.GetTextBuf(Buffer,Size);  {Puts Edit1.Text into Buffer}
  Edit2.Text := StrPas(Buffer);   {Converts Buffer to a Pascal-style string}
  FreeMem(Buffer, Size);{Frees memory allocated to Buffer}
end;
{
Note: the same thing could be accomplished more simply as follows:
} 
procedure TForm1.Button2Click(Sender: TObject);
begin
  Edit2.Text := Edit1.Text;
end; 
