How to determine if a CD is in CD-ROM drive

I was wondering if there is a Windows API that can tell me if there is a empty CD is inside a CD-ROM/DVD-Rom drive.

I've already looked at GetVolumeInformation(), but that only brings back information on the actual CD-ROM drive, not the media that is inside it, if there's even a CD in it or not.

All I'开发者_Go百科m trying to do is see if there's a cd in the drive or not and return a boolean value.

Thanks for any help

Call GetFileAttributes() on the root directory. GetFileAttributes() is quite optimized as it's commonly used as a check whether a file or directory exists.

Another method is to call GetDiskFreeSpace, which (despite its name) also returns the total disk size.

The Shell also has some useful functions. SHGetDriveMedia will tell you what's loaded, but you should first call GetDriveType().

The API you're looking for is most probably IMAPI.

I think this article here could be of help for you http://msdn.microsoft.com/en-us/magazine/cc163992.aspx

You can use DeviceIoControl API passing IOCTL_STORAGE_CHECK_VERIFY as the dwIoControlCode. This will check if a particular disc drive is ready i. e. has a disc in it and, of course, the tray is closed. Check the DeviceIoControl MSDN documentation for more info on this function.

// FROM VISTA to ....
BOOL CDYesNo(WCHAR letter) {// like F

 DWORD pdwMediaContent=0;  
 BOOL ret =1; 

 WCHAR catw[3];  // create wchar string
 catw[0]=letter; 
 catw[1]=L':';
 catw[2]=NULL;  `enter code here`
     
 HRESULT rcd=SHGetDriveMedia( catw, &pdwMediaContent); 
 //rcd normally is S_OK, maybe tested.

 if(pdwMediaContent ==0) ret=0;   

return ret;  // 0=empty
}