2

我正在做一些测试，以这种方式创建 HTMLDocument 的实例：

object[] pageText = { "<p>some text...</p>" };
var document = new HTMLDocumentClass();
var document2 = (IHTMLDocument2)document;
document2.write(pageText);

并且需要获得对 IMarkupServices 的引用。

这是我目前正在使用的代码：

Guid IID_IMarkupServices = new Guid("3050F4A0-98B5-11CF-BB82-00AA00BDCE0B");
IMarkupServices markupServices = GetService<IMarkupServices>(document, ID_IMarkupServices);

static Guid HTMLDocumentClassGuid = new Guid("25336920-03F9-11CF-8FD0-00AA00686F13");
private static T GetService<T>(IHTMLDocument2 document, Guid riid)
{
    var serviceProvider = (IServiceProvider) document;
    object service;
    serviceProvider.QueryService(ref HTMLDocumentClassGuid, ref riid, out service);
    return (T)service;
}

当我运行它（它托管在控制台应用程序中）时，会引发以下异常：

Unhandled Exception: System.InvalidCastException: Unable to cast COM object of type 'mshtml.HTMLDocumentClass' to interface type 'IServiceProvider'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{4C9A623C-FF69-3A3B-B592-43371C50DF88}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
at ConsoleApplication3.Program.GetService[T](IHTMLDocument2 document, Guid riid) in c:\users\admin\documents\visual studio 010\Projects\ConsoleApplication3\ConsoleApplication3\Program.cs:line 35
at ConsoleApplication3.Program.Main(String[] args) in c:\users\admin\documents\visual studio 2010\Projects\ConsoleApplication3\ConsoleApplication3\Program.cs:line 29

注意： 我要做的是对我用 mshtml 实现的一些对象进行单元测试。当我在 BHO（在 Internet Explorer 中）运行相同的代码时，它工作正常。

非常感谢

编辑：这是我最后用来让它工作的代码

我通过检查以下 WatiN 的实现使其工作：http ://www.java2s.com/Open-Source/CSharp/Web-Testing/WatiN/WatiN/Examples/MsHtmlBrowser/MsHtmlNativeBrowser.cs.htm 基于盛江有用的答案.

public class Program
    {
        [Guid("7FD52380-4E07-101B-AE2D-08002B2EC713")]
        [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
        public interface IPersistStreamInit
        {
            void GetClassID(out Guid pClassID);
            int IsDirty();
            void Load(System.Runtime.InteropServices.ComTypes.IStream pStm);
            void Save(System.Runtime.InteropServices.ComTypes.IStream pStm, bool fClearDirty);
            void GetSizeMax(out long pcbSize);
            void InitNew();
        }

        [STAThread]
        static void Main(string[] args)
        {
            var anHtmlDocument = new HTMLDocumentClass();
            var aPersistStream = (WB.Program.IPersistStreamInit)anHtmlDocument;
            aPersistStream.InitNew();

            var anHtmlDocument2 = (IHTMLDocument2)anHtmlDocument;
            anHtmlDocument2.write(new object[] { "test <b> foo </b>" });
            anHtmlDocument2.close();

            while (anHtmlDocument.readyState != "complete")
            {
                //This is also a important part, without this DoEvents() appz hangs on to the “loading”
                Application.DoEvents();
            }

            var aMarkupService = (IMarkupServices)anHtmlDocument;

            IMarkupPointer aPointer;
            aMarkupService.CreateMarkupPointer(out aPointer);

            var anHtmlBody = (IHTMLBodyElement)anHtmlDocument.body;
            var aSelection = anHtmlBody.createTextRange();
            aSelection.findText("foo", 0, 0);
        }
    }
4

1 回答 1

2

通过 IPersistStreamInit 接口加载文档后，IMarkupServices 的 QI，最好使用Url 名字对象作为代理。

于 2011-08-30T22:00:00.147 回答