Hello, everyone. I am not sure of the 'lpParam' parameter in CreateWindow. I read the descriptions of CreateWindow in msdn website, still I am not quite sure what it is used for. Can someone give me an explanation of it? Thanks. It is better if someone can provide me an example for using CreateWindow when the 'lpParam' parameter is not null? Thanks.

您看看这个可以对您有所帮助: http://delphi.ktop.com.tw/topic.php?TOPIC_ID=18600

Thanks, it did give me some ideas, but inside the example, the 'lpParam' parameter is also null, I still have no idea what the 'lpParam' parameter is used for? Anyway, if no other answers, i will let you have the points.