装载和/ JScript中传递数组到C＃（不是C）COM组件 [英] Loading and Passing JScript Arrays from/to C# (not C) COM Component

问题描述

我已经看过教程上的JScript数组，但是没有看到它。我看到了类似的东西问，但涉及的Win32 code不是.NET。

I have looked at tutorials on jscript arrays, but not seeing it yet. I saw something similar asked but involving Win32 code not .NET.

想知道，我怎么传递数组来回JScript和一个C＃COM组件之间？

Wondering, how do I pass arrays back and forth between JScript and a C# COM component?

例如，我在我的C＃COM，返回字符串和整型数组定义的两个属性：

For example, I have two properties defined in my C# COM that returns string and integer arrays as:

string[] HeaderLines { get; set; }
int[] ImagePixels { get; set; }

在我的test.js文件：

In my test.js file:

...

var T = new ActiveXObject("Imager.Reader"); 
...    
var headerLines = T.HeaderLines;
WScript.StdOut.WriteLine("First HeaderLine:" + headerLines[0]);
var pixels = T.ImagePixels;
WScript.StdOut.WriteLine("First Pixel: " + pixels[0]);

错误就是headerLines [0]写出：C：\\ TEMP \\ test.js（12：1）微软JScript运行时错误：'headerLines.0'为空或不是对象

The error is where headerLines[0] is written out: C:\temp\test.js(12, 1) Microsoft JScript runtime error: 'headerLines.0' is null or not an object

如果我删除headerLines在test.js，然后我得到这个错误（本质上是相同的，但对于整型数组）：C：\\ TEMP \\ test.js（12：1）微软JScript运行时错误：'像素。 0'为空或不是对象

If I remove the headerLines in test.js, then I get this error (essentially the same but for the integer array): C:\temp\test.js(12, 1) Microsoft JScript runtime error: 'pixels.0' is null or not an object

我可以从非数组属性效果蛮好的，以及将值传递给其它方法，但不能与数组。我还需要在字符串和整型数组传递到我的C＃COM组件定义为一个方法：

I can get results from non-array properties just fine as well as passing values to other methods, but not with arrays. I also need to pass in string and integer arrays into a method defined in my C# COM component as:

bool Write(string filename, string[] headerLines, int[] pix, int width, int height);

我使用Visual Studio的前preSS 2012桌面创建在C＃中的COM件。如果需要任何其他信息，只是让我知道。

I am using Visual Studio Express 2012 for Desktop for creating the COM piece in C#. If any other information is needed, just let me know.

推荐答案

微软JScript引擎执行JavaScript数组为 IDispatchEx 的对象。从C＃，他们可以通过反射或动态对象进行操作（与动态，它只能存取性能和像长度，推（）等方法，但不引用其实际指数元素）。例如：

Microsoft JScript engine implements JavaScript arrays as IDispatchEx objects. From C#, they can be manipulated via reflection or as dynamic objects (with dynamic, it's only possible to access properties and methods like length, push() etc., but not reference actual elements by their indices). Example:

JavaScript的：

var T = new ActiveXObject("MySimulator.World"); 

var ar = ["a", "b", "c"];

T.MyFunction(ar);

C＃：

public void MyFunction(object array)
{
    dynamic dynArray = array;
    int length = dynArray.length;
    dynArray.push("d");

    SetAt(array, 1, "bb"); 

    Console.WriteLine("MyFunction called, array.length: " + length);
    Console.WriteLine("array[0]: " + GetAt(array, 0));
    Console.WriteLine("array[1]: " + GetAt(array, 1));
    Console.WriteLine("array[3]: " + GetAt(array, 3));
}

static object GetAt(object array, int index)
{
    return array.GetType().InvokeMember(index.ToString(),
        System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.GetProperty,
        null, array, new object[] { });
}

static object SetAt(object array, int index, object value)
{
    return array.GetType().InvokeMember(index.ToString(),
        System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.SetProperty,
        null, array, new object[] { value });
}

输出：

MyFunction called, array.length: 3
array[0]: a
array[1]: bb
array[3]: d

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