如何使用WMI和Delphi关联逻辑驱动器和物理磁盘?

要关联逻辑驱动器和物理磁盘,必须使用 Win32_DiskDrive 类和 Win32_DiskDriveToDiskPartition , Win32_LogicalDiskToPartition ASSOCIATORS 类。

试试这个例子。

{$APPTYPE CONSOLE}

uses
  SysUtils,
  ActiveX,
  ComObj,
  Variants;


function ListDrives : string;
var
  FSWbemLocator  : OLEVariant;
  objWMIService  : OLEVariant;
  colDiskDrives  : OLEVariant;
  colLogicalDisks: OLEVariant;
  colPartitions  : OLEVariant;
  objdiskDrive   : OLEVariant;
  objPartition   : OLEVariant;
  objLogicalDisk : OLEVariant;
  oEnumDiskDrive : IEnumvariant;
  oEnumPartition : IEnumvariant;
  oEnumLogical   : IEnumvariant;
  iValue         : LongWord;
  DeviceID       : string;
begin;
  Result:='';
  FSWbemLocator   := CreateOleObject('WbemScripting.SWbemLocator');
  objWMIService   := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', '');
  colDiskDrives   := objWMIService.ExecQuery('SELECT DeviceID FROM Win32_DiskDrive');
  oEnumDiskDrive  := IUnknown(colDiskDrives._NewEnum) as IEnumVariant;
  while oEnumDiskDrive.Next(1, objdiskDrive, iValue) = 0 do
   begin
      Writeln(Format('DeviceID %s',[string(objdiskDrive.DeviceID)]));
      //Escape the `\` chars in the DeviceID value because the '\' is a reserved character in WMI.
      DeviceID        := StringReplace(objdiskDrive.DeviceID,'\','\\',[rfReplaceAll]); 
      //link the Win32_DiskDrive class with the Win32_DiskDriveToDiskPartition class
      colPartitions   := objWMIService.ExecQuery(Format('ASSOCIATORS OF {Win32_DiskDrive.DeviceID="%s"} WHERE AssocClass = Win32_DiskDriveToDiskPartition',[DeviceID]));
      oEnumPartition  := IUnknown(colPartitions._NewEnum) as IEnumVariant;
      while oEnumPartition.Next(1, objPartition, iValue) = 0 do
      begin
       if not VarIsNull(objPartition.DeviceID) then
       begin
        Writeln(Format('   Partition %s',[string(objPartition.DeviceID)]));
        //link the Win32_DiskPartition class with theWin32_LogicalDiskToPartition class.
        colLogicalDisks := objWMIService.ExecQuery('ASSOCIATORS OF {Win32_DiskPartition.DeviceID="'+VarToStr(objPartition.DeviceID)+'"} WHERE AssocClass = Win32_LogicalDiskToPartition'); 
        oEnumLogical  := IUnknown(colLogicalDisks._NewEnum) as IEnumVariant;
          while oEnumLogical.Next(1, objLogicalDisk, iValue) = 0 do
          begin
              Writeln(Format('     Logical Disk %s',[string(objLogicalDisk.DeviceID)]));
              objLogicalDisk:=Unassigned;
          end;
       end;
       objPartition:=Unassigned;
      end;
       objdiskDrive:=Unassigned;
   end;
end;

begin
 try
    CoInitialize(nil);
    try
      ListDrives;
    finally
      CoUninitialize;
    end;
 except
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
  end;
  Readln;
end.

这将输出类似的内容

DeviceID \\.\PHYSICALDRIVE0
   Partition Disk #0, Partition #0
     Logical Disk F:
DeviceID \\.\PHYSICALDRIVE1
   Partition Disk #1, Partition #0
     Logical Disk C:

使用MagWMi包装器及其一行函数(一行很慢,但这不是需要速度的地方)。 我用它来制作二级磁盘列表。

• 硬盘驱动器1->字母1、字母2
• 硬盘驱动器2->字母3、字母4
• 网络服务器1->字母5、字母6
• 网络服务器2->字母7、字母8
• 无法识别->所有其他字母

但你必须记住,有些磁盘可能没有任何字母。 所以这会告诉你有关根目录的信息,但不会更多。 磁盘C:可能派生为多个物理磁盘。 有些物理磁盘可能根本没有字母。

unit WMI_Helper;

interface

function WMINetDiskName(const disk: string { 'C:' - w/o slash } ): string;
function WMIPhysDiskName(const disk: string { 'C:' - w/o slash } ): string;
function WMIGetVolumeName(const disk: string { 'C:' - w/o slash } ): string;

implementation

uses magwmi, SysUtils, StrUtils, Windows, IOUtils;

function WMIGetProp(const query, param, resultProp: string): string;
begin
  if MagWmiGetOneQ(StringReplace(query, '%s', param, []), resultProp, Result) <= 0
  then
    Result := '';
  Result := Trim(Result);
end;

function WMINetDiskName(const disk: string { 'C:' - w/o slash } ): string;
const
  req = 'select ProviderName from Win32_MappedLogicalDisk where DeviceID = "%s"';
  prop = 'ProviderName';
var
  i: integer;
begin
  Result := WMIGetProp(req, disk, prop);

  If not TPath.IsUNCPath(Result) then
    exit('');

  i := PosEx('\', TPath.GetPathRoot(Result), 3);
  if i <= 0 then
    exit('');

  SetLength(Result, i - 1);
end;

function WMIPhysDiskName(const disk: string { 'C:' - w/o slash } ): string;
const
  resultProp = 'DeviceID';
  reqPart = 'ASSOCIATORS OF {Win32_LogicalDisk.DeviceID="%s"} WHERE ResultClass=Win32_DiskPartition';
  reqDisk = 'ASSOCIATORS OF {Win32_DiskPartition.DeviceID="%s"} WHERE ResultClass=Win32_DiskDrive';
begin
  Result := WMIGetProp(reqPart, disk, resultProp);
  if Result > '' then
    Result := WMIGetProp(reqDisk, Result, resultProp);
end;

function WMIGetVolumeName(const disk: string { 'C:' - w/o slash } ): string;
const
  prop = 'VolumeName';
  reqNet = 'select VolumeName from Win32_MappedLogicalDisk where DeviceID = "%s"';
  reqPhy = 'select VolumeName from Win32_LogicalDisk where DeviceID = "%s"';

begin
  Result := WMIGetProp(IfThen(GetDriveType(PChar(disk)) = DRIVE_REMOTE, reqNet,
    reqPhy), disk, prop);
end;

end.