使用`out`参数调用函数，在JScript中通过引用传递参数 [英] Invoking functions with `out` arguments, passing arguments by reference in JScript

问题描述

我正在JScript(WSH)中使用以下代码通过WMI连接到本地注册表:var registry = GetObject('winmgmts:{impersonationLevel=impersonate}!\\\\.\\root\\default:StdRegProv');，并且可以正常工作.

I'm using following code in JScript (WSH) to connect to local registry using WMI: var registry = GetObject('winmgmts:{impersonationLevel=impersonate}!\\\\.\\root\\default:StdRegProv'); and that works.

然后，我必须确定是否允许我删除密钥而不真正尝试删除它(例如，执行无损检查).我查看了文档，发现我需要StdRegProv.CheckAccess()方法.问题是CheckAccess返回结果作为out参数，而我在JScript中找不到VBScript的ByRef等效项.

Then I have to determine if I'm allowed to delete key without really trying to delete it (e.g. perform a non-destructive check). I looked over docs and found that I need StdRegProv.CheckAccess() method. Problem is that CheckAccess returns result as out argument and I could not find VBScript's ByRef equivalent in JScript.

在互联网上的某个地方，我发现使用SWbemServices.ExecMethod会有所帮助，但是我还没有弄清楚如何使用它.

Somewhere in the Internet I've found that using SWbemServices.ExecMethod would help somehow, but I hadn't figured out how can I use that yet.

有人可以在JScript中通过引用传递参数来执行函数调用吗?

Could anyone provide me with code sample in JScript performing function call with argument passed by reference?

推荐答案

嘿，它可以正常工作了.

Heh, got it working.

对于任何需要它的人，JScript中的CheckAccess调用看起来像这样:

For anyone who will need it, CheckAccess invokation in JScript looks something like this:

function CheckAccess(defKey, subkeyName, required) {
    var providerName = "StdRegProv";
    var funcName = "CheckAccess";

    // connect to WMI
    var services = GetObject("winmgmts:{impersonationLevel=impersonate}!\\\\.\\root\\default");

    // get provider
    var registry = services.Get(providerName);

    var in_params = registry.Methods_(funcName).InParameters.SpawnInstance_();
    in_params.hDefKey = defKey;
    in_params.sSubKeyName = subkeyName;
    in_params.uRequired = required;

    var outParams = services.ExecMethod(providerName, funcName, inParams);

    return Boolean(outParams.bGranted);
};

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