如何将一个字符串数组从ActiveX对象返回到JScript

问题描述

我需要调用一个Win32 API来获取一系列字符串，并且我想将这些字符串的数组返回到JScript。

I need to call into a Win32 API to get a series of strings, and I would like to return an array of those strings to JScript. This is for script that runs on local machine for administration scripts, not for the web browser.

我的COM对象的IDL文件具有我调用的接口：

My IDL file for the COM object has the interface that I am calling into as:

HRESULT GetArrayOfStrings([out, retval] SAFEARRAY(BSTR) * rgBstrStringArray);

函数返回correcty，但是当字符串被分配给JScript中的变量时，字符串将会丢失。

The function returns correcty, but the strings are getting 'lost' when they are being assigned to a variable in JScript.

问题是：
将字符串数组返回给JScript变量的正确方法是什么？

The question is:What is the proper way to get the array of strings returned to a JScript variable?

推荐答案

如果我没记错，你需要将 SAFEARRAY 包裹在 VARIANT ，以便它通过，然后使用在JS端解压缩它：

If i recall correctly, you'll need to wrap the SAFEARRAY in a VARIANT in order for it to get through, and then use a VBArray object to unpack it on the JS side of things:

HRESULT GetArrayOfStrings(/*[out, retval]*/ VARIANT* pvarBstrStringArray)
{
   // ...

   _variant_t ret;
   ret.vt = VT_ARRAY|VT_VARIANT;
   ret.parray = rgBstrStringArray;
   *pvarBstrStringArray = ret.Detach();
   return S_OK;
}

然后

var jsFriendlyStrings = new VBArray( axOb.GetArrayOfStrings() ).toArray();

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