Windows 7小工具没有释放ActiveX对象 [英] Windows 7 Gadget not releasing ActiveX object

问题描述

我正在使用Windows 7小工具，需要从Excel文档中提取数据。问题在于，我检索到我需要的数据后，Excel进程将不会卸载。

I'm working on a Windows 7 gadget that needs to pull data from an excel document. The problem is, is that the Excel process won't unload after I've retrieved the data I need.

这是我在初始化函数中使用的代码：

Here's the code I use in my initialization function:

    var Excel = new ActiveXObject("Excel.Application");
    Excel.Visible = false;
    Excel.DisplayAlerts = false;
    var workbooks = Excel.Workbooks;
    var workbook = workbooks.Open("\\\\SERVER\\Documents\\Sample.xlsx", 0, true);
    var activesheet = workbook.ActiveSheet;
    var cell = sheet.Cells(1, 1);
    var value = cell.Value;
    document.getElementById("content").innerHTML = value;
    delete value;
    value = null;
    delete cell;
    cell = null;
    delete activesheet;
    activesheet = null;
    delete workbook;
    workbook = null;
    delete workbooks;
    workbooks = null;
    Excel.Quit();
    delete Excel;
    Excel = null;

这都是包装在一个try-catch块，我可以验证它是否成功。所有的删除和空值分配是我试图释放对COM对象的任何引用，但我似乎缺少一些东西。有没有办法强制Excel进程卸载？

This is all wrapped in a try-catch block and I can verify that it's all succeeding. All the deletes and null assignments are my attempt to release any references to the COM objects, but I seem to be missing something. Is there some way I can force the Excel process to unload?

推荐答案

这只是Internet Explorer / JScript的工作原理引用保持一段时间，直到垃圾回收器运行。如果您将变量设置为 null ，引用应该在一段时间后被垃圾回收。您还可以通过使用JScript和IE可用的（相对未记录的） CollectGarbage（）方法来强制它收集。

This is just how Internet Explorer/JScript works — references are held for a period of time until the garbage collector runs. The reference should be garbage collected after a while if you set the variable to null. You can also force it to be collected by using the (relatively undocumented) CollectGarbage() method available to JScript and IE:

var Excel = new ActiveXObject("Excel.Application");

//... blah ...

Excel.Quit();
Excel = null;
window.setTimeout(CollectGarbage, 10);

请注意，您需要在调用<$ c $之前留下少量时间（10ms） c> CollectGarbage（），否则当您调用该函数时，该变量可能尚未被标记为集合。

Note that you need to leave a small amount of time (10ms here) before calling CollectGarbage(), otherwise when you call the function the variable may not have been marked for collection yet.

相关支持文章： http://support.microsoft.com/kb/266088

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