Hi Jerome,
Thanks for the guidelines.
1.Yes.That's where I am.I mean if I select a include path through open directory dialog and then 'select',the directory string can can't fill in the listbox.It is blank anyhow.THe only way is to type in the listbox.Please test.
2.I don't think it is a volume issue.
3.Yes.you are correct.I used another dx header.Now I changed it and it compiles and run.After I pressed the Play button,the sound can be play,but after that,the application crashed.
Regards,
Sam