delphi - 如何使用 WMI 和 Delphi 关联逻辑驱动器和物理磁盘？

Question

我已经在一个可以从 Micro 读取信息的应用程序上进行了很长时间的工作，一些(大多数)失败了，更多仍然缺少一些，我正在使用 WMI 和 Delphi。我面临的问题是我需要列出属于每个 HD 的单元，例如:HD1 具有驱动器 C:、D: 等。

谢谢

Answer 1

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

尝试这个示例。

{$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.

这将输出类似这样的内容

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