Shoutbox

I've gone back to working on Interface Writer - specifically the bit that loads XML files.  It's a long bit of code, so I've put it in a spoiler tag. 

Spoiler:

js code:

---

function OnEvent_Initialize(MessengerStart)
{
    var Interface = LoadInterface(MsgPlus.ScriptFilesPath + "\\" + "Windows.xml");
    var JSONO = new JSON();
    var JSONSource = JSONO.toJSON(Interface);
    WndWriterViewSource = MsgPlus.CreateWnd("Windows.xml", "WndWriterViewSource", 0);
    WndWriterViewSource.RichEdit_SetCharFormat("EdtSource", false, -1, -1, -1, -1, -1, -1, "Lucida Console");
    WndWriterViewSource.SetControlText("EdtSource", "JSON Output of \"Windows.xml\"\n\n-----\n\n" + JSONSource);
}

function LoadInterface(File)
{
    var XMLO = new ActiveXObject("Microsoft.XMLDOM");
    var Interface = new Object();
    Interface.Ok = true;
    if (!XMLO.load(File))
    {
        Interface.Ok = false;
        Interface.Error = XMLO.parseError.reason + "Line number: " + XMLO.parseError.line + " (position " + XMLO.parseError.linepos + ").";
        XMLO = null;
        return Interface;
    }
    if (XMLO.selectSingleNode("//Interfaces/Window") === null)
    {
        Interface.Ok = false;
        Interface.Error = "The interface file must contain a root <Interfaces> tag, as well as at least one window.";
        XMLO = null;
        return Interface;
    }
    Interface.Window = new Object();
    Interface.WindowId = new Array();
    var WindowEnum = new Enumerator(XMLO.selectNodes("//Interfaces/Window"));
    for (; !WindowEnum.atEnd(); WindowEnum.moveNext())
    {
        var WindowNode = WindowEnum.item();
        var WindowId = WindowNode.getAttribute("Id");
        Interface.WindowId.push(WindowId);
        Interface.Window[WindowId] = new Object();
        Interface.Window[WindowId].Control = new Object();
        Interface.Window[WindowId].ControlId = new Array();
        var ControlEnum = new Enumerator(XMLO.selectNodes("//Interfaces/Window[@Id=\"" + WindowId + "\"]/Controls/Control"));
        if (ControlEnum.count() > 0)
        {
            for (; !ControlEnum.atEnd(); ControlEnum.moveNext())
            {
                var ControlNode = ControlEnum.item();
                var ControlId = ControlNode.getAttribute("Id");
                var ControlType = ControlNode.getAttribute("xsi:type");
                if (ControlId in Interface.Window[WindowId].Control)
                {
                    ErrorDialog("Warning: two controls share the name \"" + ControlId + "\" in window \"" + WindowId + "\".\nThe second occurrence of this control name will be ignored.", "Load Interface File");
                }
                else
                {
                    Interface.Window[WindowId].ControlId.push(ControlId);
                    Interface.Window[WindowId].Control[ControlId] = new Object();
                    var ControlPosEnum = new Enumerator(XMLO.selectNodes("//Interfaces/Window[@Id=\"" + WindowId + "\"]/Controls/Control[@Id=\"" + ControlId + "\"]/Position"));
                    if (ControlPosEnum.count() == 0)
                    {
                        ErrorDialog("Warning: no position tag found for control \"" + ControlId + "\" in window \"" + WindowId + "\".", "Load Interface File");
                    }
                    else
                    {
                        Interface.Window[WindowId].Control[ControlId].Position = new Object();
                        for (; !ControlPosEnum.atEnd(); ControlPosEnum.moveNext())
                        {
                            var ControlPosNode = ControlPosEnum.item();
                            Interface.Window[WindowId].Control[ControlId].Position.Left = ControlPosNode.getAttribute("Left").toString();
                            Interface.Window[WindowId].Control[ControlId].Position.Top = ControlPosNode.getAttribute("Top").toString();
                            Interface.Window[WindowId].Control[ControlId].Position.Width = ControlPosNode.getAttribute("Width").toString();
                            try
                            {
                                Interface.Window[WindowId].Control[ControlId].Position.Height = ControlPosNode.getAttribute("Height").toString();
                            }
                            catch (error)
                            {
                            }
                        }
                    }
>>>                    var ControlCaption = XMLO.selectSingleNode("//Interfaces/Window[@Id=\"" + WindowId + "\"]/Controls/Control[@Id=\"" + ControlId + "\"]/Caption"); <<<
>>>                    Debug.Trace(ControlCaption); <<<
                }
            }
        }
        Interface.Window[WindowId].Element = new Object();
        Interface.Window[WindowId].ElementId = new Array();
        var ElementEnum = new Enumerator(XMLO.selectNodes("//Interfaces/Window[@Id=\"" + WindowId + "\"]/Elements/Element"));
        if (ElementEnum.count() > 0)
        {
            for(; !ElementEnum.atEnd(); ElementEnum.moveNext())
            {
                var ElementNode = ElementEnum.item();
                var ElementId = ElementNode.getAttribute("Id");
                var ElementType = ElementNode.getAttribute("xsi:type");
                if (ElementId in Interface.Window[WindowId].Element)
                {
                    ErrorDialog("Warning: two elements share the name \"" + ElementId + "\" in window \"" + WindowId + "\".\nThe second occurrence of this control name will be ignored.", "Load Interface File");
                }
                else
                {
                    Interface.Window[WindowId].ElementId.push(ElementId);
                    Interface.Window[WindowId].Element[ElementId] = new Object();
                    var ElementPosEnum = new Enumerator(XMLO.selectNodes("//Interfaces/Window[@Id=\"" + WindowId + "\"]/Controls/Element[@Id=\"" + ElementId + "\"]/Position"));
                    if (ElementPosEnum.count() == 0)
                    {
                        ErrorDialog("Warning: no position tag found for element \"" + ControlId + "\" in window \"" + WindowId + "\".", "Load Interface File");
                    }
                    else
                    {
                        Interface.Window[WindowId].Element[ElementId].Position = new Object();
                        for (; !ElementPosEnum.atEnd(); ElementPosEnum.moveNext())
                        {
                            var ElementPosNode = ElementPosEnum.item();
                            Interface.Window[WindowId].Element[ElementId].Position.Left = ElementPosNode.getAttribute("Left").toString();
                            Interface.Window[WindowId].Element[ElementId].Position.Top = ElementPosNode.getAttribute("Top").toString();
                            Interface.Window[WindowId].Element[ElementId].Position.Width = ElementPosNode.getAttribute("Width").toString();
                            try
                            {
                                Interface.Window[WindowId].Element[ElementId].Position.Height = ElementPosNode.getAttribute("Height").toString();
                            }
                            catch (error)
                            {
                            }
                        }
                    }
                }
            }
        }
    }
    XMLO = null;
    return Interface;
}

Enumerator.prototype.count = function()
{
    var i = 0;
    while (!this.atEnd())
    {
        this.moveNext();
        i++
    }
    this.moveFirst();
    return i;
}

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The highlighted line throws a type mismatch error.  Using nodeObj.getAttribute() works for something like <Tag Value="String"/>, but I want to get something like <Tag>String</Tag>.  How would I go about this, since I only just understand the basics of the XML DOM object...

The type mismatch is because you're trying to send an Element object as parameter to Debug.Trace, and the scripting engine doesn't know how to convert that object to a string. (It would work if the object had a toString() method defined, but it doesn't.)

To read the content of an Element, you use the text property. In your case, that would be as simple as:

js code:

---

Debug.Trace(ControlCaption.text);

---

And here's a nice reference of the XML DOM at DevGuru or at MSDN. So next time you're puzzled on something, go have a look there. They're both very complete and comprehensive, both for the newbie scripter as the experienced developer.

Ah.    Thanks!