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driveinfo.pasunit DriveInfo;
{ TODO: Validate driveName }
{ TODO: Implement RootDirectory }
interface
uses
Classes, Windows, SysUtils;
type
TDriveType = (
dtUnknown, // The type of drive is unknown.
dtNoRootDirectory, // The drive does not have a root directory.
dtRemovable, // The drive is a removable storage device, such as a floppy disk drive or a USB flash drive.
dtFixed, // The drive is a fixed disk.
dtNetwork, // The drive is a network drive.
dtCDRom, // The drive is an optical disc device, such as a CD or DVD-ROM.
dtRam // The drive is a RAM disk.
);
TDriveInfo = record
type
TDriveInfoDynArray = array of TDriveInfo;
private
fDriveName: string;
fAvailableFreeSpace: Int64;
fTotalSize: Int64;
fTotalFreeSpace: Int64;
fVolumeName: array[0..MAX_PATH] of Char;
fFileSystemName: array[0..MAX_PATH] of Char;
fSerialNumber: DWORD;
fMaximumComponentLength: DWORD;
fFileSystemFlags: DWORD;
function GetAvailableFreeSpace: Int64;
function GetDriveFormat: string;
function GetDriveType: TDriveType;
function GetDriveTypeString: string;
function GetIsReady: Boolean;
// function GetRootDirectory: string;
function GetTotalFreeSpace: Int64;
function GetTotalSize: Int64;
function GetVolumeLabel: string;
procedure SetVolumeLabel(const Value: string);
private
procedure CheckIsReady;
procedure Loaded;
public
constructor Create(const driveName: string);
class function GetDrives: TDriveInfoDynArray; static;
property AvailableFreeSpace: Int64 read GetAvailableFreeSpace;
property DriveFormat: string read GetDriveFormat;
property DriveType: TDriveType read GetDriveType;
property DriveTypeString: string read GetDriveTypeString;
property IsReady: Boolean read GetIsReady;
property Name: string read fDriveName;
// property RootDirectory: string read GetRootDirectory;
property TotalFreeSpace: Int64 read GetTotalFreeSpace;
property TotalSize: Int64 read GetTotalSize;
property VolumeLabel: string read GetVolumeLabel write SetVolumeLabel;
end;
resourcestring
SUnknownDriveDescription = 'Unknown Drive';
SNoRootDirectoryDescription = 'No Root Directory';
SRemovableDescription = 'Removable Drive';
SFixedDescription = 'Fixed Drive';
SNetworkDescription = 'Network Drive';
SCDRomDescription = 'CD-Rom Drive';
SRamDescription = 'Ram Drive';
const
DriveTypeStrings: array[TDriveType] of string = (
SUnknownDescription, // The type of drive is unknown.
SNoRootDirectoryDescription, // The drive does not have a root directory.
SRemovableDescription, // The drive is a removable storage device, such as a floppy disk drive or a USB flash drive.
SFixedDescription, // The drive is a fixed disk.
SNetworkDescription, // The drive is a network drive.
SCDRomDescription, // The drive is an optical disc device, such as a CD or DVD-ROM.
SRamDescription // The drive is a RAM disk.
);
implementation
constructor TDriveInfo.Create(const driveName: string);
begin
fDriveName := IncludeTrailingPathDelimiter(UpperCase(driveName));
end;
class function TDriveInfo.GetDrives: TDriveInfoDynArray;
var
drives: TStringDynArray;
i: Integer;
begin
drives := Environment.GetLogicalDrives;
SetLength(Result, Length(drives));
for i := 0 to High(drives) do
begin
Result[i] := TDriveInfo.Create(drives[i]);
end;
end;
procedure TDriveInfo.CheckIsReady;
begin
if not IsReady then
raise EIOException.CreateResFmt(@SDriveNotReady, [fDriveName]);
end;
procedure TDriveInfo.Loaded;
begin
CheckIsReady;
Win32Check(SysUtils.GetDiskFreeSpaceEx(
PChar(fDriveName),
fAvailableFreeSpace,
fTotalSize,
@fTotalFreeSpace
));
Win32Check(Windows.GetVolumeInformation(
PChar(fDriveName),
fVolumeName,
Length(fVolumeName),
@fSerialNumber,
fMaximumComponentLength,
fFileSystemFlags,
fFileSystemName,
Length(fFileSystemName)
));
end;
function TDriveInfo.GetAvailableFreeSpace: Int64;
begin
Loaded;
Result := fAvailableFreeSpace;
end;
function TDriveInfo.GetDriveFormat: string;
begin
Loaded;
Result := fFileSystemName;
end;
function TDriveInfo.GetDriveType: TDriveType;
var
value: Cardinal;
begin
value := Windows.GetDriveType(PChar(fDriveName));
case value of
DRIVE_NO_ROOT_DIR: Result := dtNoRootDirectory;
DRIVE_REMOVABLE: Result := dtRemovable;
DRIVE_FIXED: Result := dtFixed;
DRIVE_REMOTE: Result := dtNetwork;
DRIVE_CDROM: Result := dtCDRom;
DRIVE_RAMDISK: Result := dtRam;
else Result := dtUnknown; // DRIVE_UNKNOWN
end;
end;
function TDriveInfo.GetDriveTypeString: string;
begin
Result := DriveTypeStrings[Self.DriveType];
end;
function TDriveInfo.GetIsReady: Boolean;
begin
Result := Length(fDriveName) > 0;
Result := Result and (SysUtils.DiskSize(Ord(fDriveName[1]) - $40) > -1);
end;
function TDriveInfo.GetTotalFreeSpace: Int64;
begin
Loaded;
Result := fTotalFreeSpace;
end;
function TDriveInfo.GetTotalSize: Int64;
begin
Loaded;
Result := fTotalSize;
end;
function TDriveInfo.GetVolumeLabel: string;
begin
Loaded;
Result := fVolumeName;
end;
procedure TDriveInfo.SetVolumeLabel(const Value: string);
begin
CheckIsReady;
Win32Check(Windows.SetVolumeLabel(PChar(fDriveName), PChar(value)));
end;
end. 相关阅读 >>
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