从Delphi访问BcdStore

Question

我正在尝试将此代码片段转换为Delphi,而我却陷入困境for each objWBL in colObjects.

if not objBcdStore.EnumerateObjects( &h10200003, colObjects ) then
    WScript.Echo "ERROR objBcdStore.EnumerateObjects( &h10200003 ) failed."
    WScript.Quit(1)
end if

for each objWBL in colObjects
    WScript.Echo ""
    WScript.Echo "Windows Boot Loader"
    WScript.Echo "-------------------"

    WScript.Echo "identifier              " & GetBcdId( objWBL.Id )

    If objWBL.Id = current then

      if not objWBL.GetElement(BcdOSLoaderInteger_NumberOfProcessors, objElement ) then
          WScript.Echo "ERROR WBL GetElement for " & Hex(BcdOSLoaderInteger_NumberOfProcessors) & " failed."
          WScript.Quit(1)
      end if
      WScript.Echo "numproc              " & objElement.Integer

      if not objWBL.GetElement(BcdOSLoaderBoolean_UseBootProcessorOnly, objElement ) then
          WScript.Echo "ERROR WBL GetElement for " & Hex(BcdOSLoaderBoolean_UseBootProcessorOnly) & " failed."
          WScript.Quit(1)
      end if
      WScript.Echo "onecpu              " & objElement.Boolean

    end if
next

我的部分q&d翻译(谨慎,必须是管理员才能运行它):

uses
  OleAuto,
  ActiveX;

function GetObject(const objectName: String): IDispatch;
var
  bindCtx: IBindCtx;
  moniker: IMoniker;
  chEaten: Integer;
begin
  OleCheck(CreateBindCtx(0, bindCtx));
  OleCheck(MkParseDisplayName(bindCtx, StringToOleStr(objectName), chEaten, moniker));
  OleCheck(moniker.BindToObject(bindCtx, nil, IDispatch, Result));
end;

procedure TForm44.btnClick(Sender: TObject);
var
  colObjects   : OleVariant;
  objBcdStore  : OleVariant;
  objWMIService: OleVariant;
begin
  objWMIService := GetObject('winmgmts:{impersonationlevel=Impersonate,(Backup,Restore)}!root/wmi:BcdStore');
  if not objWMIService.OpenStore('', objBcdStore) then
    Caption := 'error'
  else begin
    objBcdStore.EnumerateObjects($10200003, colObjects);
    //???
  end;
end;

EnumerateObjects定义为

boolean EnumerateObjects(
  [in]   uint32 Type,
  [out]  BcdObject Objects[]
);

我不知道如何在Delphi中遍历BcdObject数组.

Answer 1

你必须使用VarArrayLowBound和VarArrayHighBound函数来获取函数返回的变量数组的边界,EnumerateObjects然后你可以使用for循环迭代数组的元素.

检查这个样本

Uses
 ComObj,
 ActiveX;

function GetObject(const objectName: String): IDispatch;
var
  bindCtx: IBindCtx;
  moniker: IMoniker;
  chEaten: Integer;
begin
  OleCheck(CreateBindCtx(0, bindCtx));
  OleCheck(MkParseDisplayName(bindCtx, StringToOleStr(objectName), chEaten, moniker));
  OleCheck(moniker.BindToObject(bindCtx, nil, IDispatch, Result));
end;


procedure TForm44.Button1Click(Sender: TObject);
var
  colObjects   : OleVariant;
  objBcdStore  : OleVariant;
  objWMIService: OleVariant;

  i : Integer;
  objWBL : OleVariant;
begin
  objWMIService := GetObject('winmgmts:{impersonationlevel=Impersonate,(Backup,Restore)}!root/wmi:BcdStore');
  if not objWMIService.OpenStore('', objBcdStore) then
    Caption := 'error'
  else
  begin
    objBcdStore.EnumerateObjects($10200003, colObjects);
       if not VarIsNull(colObjects) and VarIsArray(colObjects) then
       for i := VarArrayLowBound(colObjects, 1) to VarArrayHighBound(colObjects, 1) do
       begin
          objWBL:=colObjects[i];
          //do your stuff here


       end;
  end;
end;