当注册表项在WMI中有空格时，注册表值返回null

Question

当试图使用C#中的WMI从远程计算机检索具有空格的注册表项的值时(使用WMI的原因：需要身份验证和模拟(，GetStringValue返回null，但当该注册表项没有空格时，它可以完美地工作。使用@符号或标准"；字符串的表示法没有帮助。我试着把钥匙用双引号括起来。也无济于事。

这是我写的代码：

public static string GetRemoteRegistryValue(string MachineName, string username, string password)
{
string regValue = string.Empty;
ConnectionOptions opt = new ConnectionOptions();
opt.Impersonation = ImpersonationLevel.Impersonate;
opt.EnablePrivileges = true;
opt.Username = username;
opt.Password = password;
opt.Impersonation = ImpersonationLevel.Impersonate;
opt.EnablePrivileges = true;
try
{
ManagementPath p = new ManagementPath("\\" + MachineName + "\root\cimv2");
ManagementScope msc = new ManagementScope(p, opt);
msc.Connect();
string softwareRegLoc = ""SOFTWARE\VMware, Inc.\VMware Drivers"";
//string softwareRegLoc = @"""SOFTWARESAP BusinessObjectsSuite XI 4.0Config Manager""";
ManagementClass registry = new ManagementClass(msc, new ManagementPath("StdRegProv"), null);
ManagementBaseObject inParams = registry.GetMethodParameters("GetStringValue");
inParams["hDefKey"] = 0x80000002;//HKEY_LOCAL_MACHINE
inParams["sSubKeyName"] = softwareRegLoc;
inParams["sValueName"] = "VmciHostDevInst";
// Read Registry Key Names 
ManagementBaseObject outParams = registry.InvokeMethod("GetStringValue", inParams, null);
if (outParams.Properties["sValue"].Value != null)
{
regValue = outParams.Properties["sValue"].Value.ToString();
}
}
catch (ManagementException Ex)
{
}
catch (System.UnauthorizedAccessException Ex)
{
}
catch (Exception Ex)
{
}
return regValue;
}

这个问题的解决方案是什么？

Answer 1

好的，这里有两点：

1. 您不应该使用引号。因此，将""SOFTWARE\VMware, Inc.\VMware Drivers""替换为"SOFTWARE\VMware, Inc.\VMware Drivers"。

2. 您尝试访问的路径属于64位提供程序。为了能够访问它(默认情况下(，您的应用程序需要将其平台目标设置为x64。否则，您的应用程序将尝试访问HKEY_LOCAL_MACHINESOFTWAREWOW6432NodeVMware, Inc.VMware Drivers路径，该路径可能不存在。

删除引号并以x64为目标对我来说效果很好，我得到了问题中提到的确切路径的值。

如果您的平台目标设置为x86(或选中Prefer 32-bit复选框的Any CPU(，并且不想将其更改为x64，则必须强制WMI访问64位注册表配置单元。查看文档以了解更多信息。

下面是一个完整的例子：

public static string GetRemoteRegistryValue(string MachineName, string username, string password)
{
string regValue = string.Empty;
ConnectionOptions opt = new ConnectionOptions();
opt.Impersonation = ImpersonationLevel.Impersonate;
opt.EnablePrivileges = true;
opt.Username = username;
opt.Password = password;
opt.Impersonation = ImpersonationLevel.Impersonate;
opt.EnablePrivileges = true;
try
{
ManagementPath p = new ManagementPath("\\" + MachineName + "\root\cimv2");
ManagementScope msc = new ManagementScope(p, opt);
msc.Connect();
string softwareRegLoc = "SOFTWARE\VMware, Inc.\VMware Drivers";
ManagementClass registry = new ManagementClass(msc, new ManagementPath("StdRegProv"), null);
ManagementBaseObject inParams = registry.GetMethodParameters("GetStringValue");
inParams["hDefKey"] = 0x80000002;//HKEY_LOCAL_MACHINE
inParams["sSubKeyName"] = softwareRegLoc;
inParams["sValueName"] = "VmciHostDevInst";
ManagementNamedValueCollection objCtx = new ManagementNamedValueCollection();
objCtx.Add("__ProviderArchitecture", 64);
objCtx.Add("__RequiredArchitecture", true);
InvokeMethodOptions options = new InvokeMethodOptions(objCtx, TimeSpan.MaxValue);
// Read Registry Key Names 
ManagementBaseObject outParams = registry.InvokeMethod("GetStringValue", inParams, options);
if (outParams.Properties["sValue"].Value != null)
{
regValue = outParams.Properties["sValue"].Value.ToString();
}
}
catch (ManagementException Ex)
{
throw;
}
catch (System.UnauthorizedAccessException Ex)
{
throw;
}
catch (Exception Ex)
{
throw;
}
return regValue;
}

当应用程序以x86为目标时，上面的代码返回了VmciHostDevInst的值。