Re: DVD disk detection

Sat Mar 15 2003, Paulo Richards wrote:
> Hello.
> I'm working on a multimedia player based on PC.
> It will be only an administrator for external aplications that will handle the 
> diferent tasks.
> I like that when you insert a media on the drive, press play, and it play
> For that i have to identify what kind of media is inserted, i have no problem 
> with cdroms (audio, vcd, data cds with divx) using ioctl calls, but i can't 
> identify dvds
> I'm using libdvdread for that, i thougt that if i try to open the dvd, and 
> it's succeded, it's a dvd, if not, is a cdrom.
> But it dosn't work.
> this is the code (C++):
> 
> dvd_reader_t *dvd;
> dvd=DVDOpen("dev/hdc");
That would be "/dev/hdc" right?  

> if (&dvd!=0)
Do    if (dvd != NULL)
Don't test the address of the dvd pointer, but rather test if the 
pointer value is not null.. the address will always be != NULL.
Your compiler should have given you a warning here.

>  {
>     DVDClose(dvd);
>     return 4; //type 4, dvd 
>   }
> else 
> //is cdrom, cdrom code..
> 
> What i'm doing wrong?, anyone have other idea for doing this?
> any help will be really appreciate.
> 

-- 
Håkan Hjort