我怎样才能得到和bcdedit /enum一样的结果呢？

Question

除了使用wmi和C#之外，我正在尝试获取与使用bcdedit命令"bcdedit /enum ALL“获得的相同信息。我知道如何获取bootmgr条目(参见代码)，但我无法获取所有条目，尤其是设备选项是我要查找的信息。有谁知道如何做到这一点吗？

这是我用来获取标准和遗留操作系统启动条目的代码。

    public class BCDWMI
{
    public static readonly UInt32 BCDE_STANDARD_OS_ENTRY = 0x10200003;
    public static readonly UInt32 BCDE_LEGACY_OS_ENTRY = 0x10300006;
    public static readonly UInt32 BcdLibraryElementTypeString_Description = 0x12000004;

    public static Dictionary<string, string> EnumerateObjectsByType(uint bcdType, string storePath)
    {

        Dictionary<string, string> dictEntries = null;

        ConnectionOptions options = new ConnectionOptions();
        options.Impersonation = ImpersonationLevel.Impersonate;
        options.EnablePrivileges = true;
        ManagementScope MgmtScope = new ManagementScope("root\\WMI", options);
        ManagementPath MgmtPath = new ManagementPath("root\\WMI:BcdStore.FilePath='" + storePath + "'");
        ManagementObject bcdStore = new System.Management.ManagementObject(MgmtScope, MgmtPath, null);
        ManagementBaseObject[] mboArray;

        bool success = EnumerateObjects(bcdStore, bcdType, out mboArray);
        if (success)
        {
            dictEntries = new Dictionary<string, string>();

            foreach (ManagementBaseObject mbo in mboArray)
            {
                ManagementPath BcdObjectPath = new ManagementPath("root\\WMI:BcdObject.Id=\"" + mbo.GetPropertyValue("Id") + "\",StoreFilePath='" + storePath + "'");

                ManagementObject BcdObject = new ManagementObject(MgmtScope, BcdObjectPath, null);
                ManagementBaseObject Element;
                String Description = String.Empty;
                try
                {
                    bool getDescripStatus = GetElement(BcdObject, BcdLibraryElementTypeString_Description, out Element);
                    if (getDescripStatus)
                        Description = Element.GetPropertyValue("String").ToString();
                }
                catch (Exception)
                {
                }
                dictEntries.Add((string)mbo.GetPropertyValue("Id"), String.Format("Type: {0:X8} {1}", mbo.GetPropertyValue("Type"), Description));
            }
        }
        return dictEntries;
    }

    public static bool EnumerateObjects(ManagementObject bcdStore, uint Type, out System.Management.ManagementBaseObject[] Objects)
    {
        System.Management.ManagementBaseObject inParams = null;
        inParams = bcdStore.GetMethodParameters("EnumerateObjects");
        inParams["Type"] = ((uint)(Type));
        System.Management.ManagementBaseObject outParams = bcdStore.InvokeMethod("EnumerateObjects", inParams, null);
        Objects = ((System.Management.ManagementBaseObject[])(outParams.Properties["Objects"].Value));
        return System.Convert.ToBoolean(outParams.Properties["ReturnValue"].Value);
    }

    public static bool GetElement(ManagementObject bdcObject, uint Type, out System.Management.ManagementBaseObject Element)
    {
        System.Management.ManagementBaseObject inParams = null;
        inParams = bdcObject.GetMethodParameters("GetElement");
        inParams["Type"] = ((uint)(Type));
        System.Management.ManagementBaseObject outParams = bdcObject.InvokeMethod("GetElement", inParams, null);
        Element = ((System.Management.ManagementBaseObject)(outParams.Properties["Element"].Value));
        return System.Convert.ToBoolean(outParams.Properties["ReturnValue"].Value);
    }
}

为了查询系统存储，我像这样调用函数。

            Dictionary<string, string> StdOSEntries = BCDWMI.EnumerateObjectsByType(BCDWMI.BCDE_STANDARD_OS_ENTRY, String.Empty);
        foreach (String guid in StdOSEntries.Keys)
            Debug.WriteLine(String.Format("Id={0} {1}", guid,  StdOSEntries[guid]));

Answer 1

如果您需要了解感兴趣的引导条目的类型值，可以使用bcdedit.exe查找该条目的GUID，然后将该条目加载到程序中，将GUID放入ManagementPath中，就像您在中所做的那样：

ManagementPath BcdObjectPath = new ManagementPath("root\\WMI:BcdObject.Id=\"" + "{Guid goes here}" + "\",StoreFilePath='" + storePath + "'");

然后获取Type属性的值，如下所示：

uint Type = (uint)BcdObject["Type"];
Console.WriteLine("{0:X8}", Type);

如果bcdedit.exe显示{current}或{bootmgr}之类的“众所周知”标识符，请使用this document将该标识符映射到GUID。

您还可以通过编程方式枚举类型，如下所示：

for (uint a = 1; a <= 10; a++) {
    uint FirmwareType = 0x10100000 | a;
    uint BootType = 0x10200000 | a;
    uint LegacyType = 0x10300000 | a;
    uint RealModeType = 0x10400000 | a;
}

它会给出像这里这样的标识符

public static readonly UInt32 BCDE_STANDARD_OS_ENTRY = 0x10200003;
public static readonly UInt32 BCDE_LEGACY_OS_ENTRY = 0x10300006;

有关这些标识符是如何构成的说明，请参阅WMI documentation on BcdObject class。

Answer 2

我找到了解决方案。就像往常一样，这是非常明显和简单的。我刚将0x0作为Type传递给调用。

Dictionary<string, string> StdOSEntries = BCDWMI.EnumerateObjectsByType(0, String.Empty);

这就是我所得到的。

    Id: {0ce4991b-e6b3-4b16-b23c-5e0d9250e5d9} Type: 20100000 
Id: {4636856e-540f-4170-a130-a84776f4c654} Type: 20100000 
Id: {6efb52bf-1766-41db-a6b3-0ee5eff72bd7} Type: 20200003 
Id: {7619dcc8-fafe-11d9-b411-000476eba25f} Type: 30000000 
Id: {7619dcc9-fafe-11d9-b411-000476eba25f} Type: 10200003 Windows Setup 
Id: {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e} Type: 20100000 
Id: {7ff607e0-4395-11db-b0de-0800200c9a66} Type: 20200003 Hypervisor Settings
Id: {9dea862c-5cdd-4e70-acc1-f32b344d4795} Type: 10100002 Windows Boot Manager
Id: {a19f4228-8f0e-11e7-ac85-005056c00008} Type: 30000000 
Id: {a1c5dee9-8f0e-11e7-ac85-005056c00008} Type: 10200003 WinPE x86
Id: {a20de869-8f0e-11e7-ac85-005056c00008} Type: 10200003 WinPE amd64
Id: {b2721d73-1db4-4c62-bf78-c548a880142d} Type: 10200005 Windows Memory Diagnostic

我的设备选项现在以类型0x30000000列出。因此，如果我传递0x30000000，该函数将返回两个设备。