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Annotation of q_a/samples/drives/readme, revision 1.1

1.1     ! root        1:  Sample: Determining Drive and File System Type
        !             2: 
        !             3: Summary:
        !             4: 
        !             5: A demonstration of how the GetDriveType and
        !             6: GetVolumeInformation functions determine all logical drives
        !             7: on a system, their disk type (local, remote, CD-ROM, and so
        !             8: on), and their file system type (FAT, HPFS, and so on) is
        !             9: available in a sample file named DRIVES.
        !            10: 
        !            11: More Information:
        !            12: 
        !            13: The additional API functions, GetLogicalDrives and
        !            14: GetLogicalDriveStrings, are not required to determine the
        !            15: drive and file system type, but are included as an example
        !            16: of how these API functions can enhance the efficiency of
        !            17: disk querying API calls.
        !            18: 
        !            19: When a drive type is removable (for example, a floppy disk
        !            20: drive), then additional precautions are taken before
        !            21: accessing this drive. A validation check is made to see if
        !            22: media exists in the drive before proceeding. A simple test
        !            23: of opening any file in the root directory of the removable
        !            24: media drive using the OpenFile API function determines the
        !            25: media's presence. If the OpenFile call returns a handle,
        !            26: then media is present and further disk querying calls are
        !            27: safely made on the logical drive. If the OpenFile call
        !            28: fails, then no media is present and no further attempts to
        !            29: query this drive are allowed. Note: in order to eliminate an
        !            30: unwanted pop-up, prompting the user to insert a disk in the
        !            31: drive, from being generated by the operating system, the
        !            32: error mode is temporarily adjusted, using SetErrorMode, to
        !            33: allow any OpenFile errors to immediately return to the
        !            34: calling routine.
        !            35: 
        !            36: The Win32 API functions used in this sample include the
        !            37: following:
        !            38: 
        !            39:    GetDriveType     GetVolumeInform  SetErrorMode   
        !            40:                     ation
        !            41:    GetLogicalDrives lclose                          
        !            42:    GetLogicalDriveS OpenFile                        
        !            43:    trings
        !            44: 
        !            45: 
        !            46: 

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