libburn库的使用

Question

/** Scan for drives. This function MUST be called until it returns nonzero.
    In case of re-scanning:
    All pointers to struct burn_drive and all struct burn_drive_info arrays
    are invalidated by using this function. Do NOT store drive pointers across
    calls to this function !
    To avoid invalid pointers one MUST free all burn_drive_info arrays
    by burn_drive_info_free() before calling burn_drive_scan() a second time.
    If there are drives left, then burn_drive_scan() will refuse to work.

    After this call all drives depicted by the returned array are subject
    to eventual (O_EXCL) locking. See burn_preset_device_open(). This state
    ends either with burn_drive_info_forget() or with burn_drive_release().
    It is unfriendly to other processes on the system to hold drives locked
    which one does not definitely plan to use soon.
    @param drive_infos Returns an array of drive info items (cdroms/burners).
                  The returned array must be freed by burn_drive_info_free()
                  before burn_finish(), and also before calling this function
                  burn_drive_scan() again.
    @param n_drives Returns the number of drive items in drive_infos.
    @return 0 while scanning is not complete
            >0 when it is finished successfully,
            <0 when finished but failed.
*/
int burn_drive_scan(struct burn_drive_info *drive_infos[],
            unsigned int *n_drives);

博主我用这个函数为甚麽会一直返回0呢

Answer 1

发现您可能没有正确地使用burn_drive_scan函数。这个函数的作用是扫描可用的光驱，并返回一个包含光驱信息的数组。这个函数需要在一个循环中调用，直到它返回非零值为止。如果您只调用一次这个函数，它可能会返回0，表示扫描还没有完成。