调用Windows Media Format 编辑asf文件问题!

[lxxlily]

写了一个调用COM的WMVCore.dll的class,然后我在程序中要对一个asf流媒体文件进行编辑，加入marker.代码如下

using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using WMFSDK;

namespace MediaMarkersTools
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string pwszFileName = "D:\\test.asf";
            
            IWMMetadataEditor MetadataEditor;
            IWMHeaderInfo3 HeaderInfo3;

            WMFLibBase.WMCreateEditor(out MetadataEditor);

            MetadataEditor.Open(pwszFileName);

            HeaderInfo3 = (IWMHeaderInfo3)MetadataEditor;

            ushort count = 0;
            HeaderInfo3.GetMarkerCount(out count);
            while(count>0)
            {
                HeaderInfo3.RemoveMarker(0);
                count--;
            }


            //10000000为一秒           
            HeaderInfo3.AddMarker("Lixiaoxiang", 10000000);
            HeaderInfo3.AddMarker("Lily", 20000000);
            MetadataEditor.Flush();
            MetadataEditor.Close();
        }
    }
}

[lxxlily]

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[mao924]

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[lxxlily]

为何运行后MetadataEditor.Open(pwszFileName);报错
异常来自 HRESULT:0xC00D07E2
未处理 System.Runtime.InteropServices.COMException
Message="异常来自 HRESULT:0xC00D07E2"
Source="WMFSDK"
ErrorCode=-1072887838
StackTrace:
在 WMFSDK.IWMMetadataEditor.Open(String pwszFilename)
在 MediaMarkersTools.Form1.button1_Click(Object sender, EventArgs e) 位置 D:\ProgramCode\MediaMarkersTools\MediaMarkersTools\Form1.cs:行号 30
在 System.Windows.Forms.Control.OnClick(EventArgs e)
在 System.Windows.Forms.Button.OnClick(EventArgs e)
在 System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
在 System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
在 System.Windows.Forms.Control.WndProc(Message& m)
在 System.Windows.Forms.ButtonBase.WndProc(Message& m)
在 System.Windows.Forms.Button.WndProc(Message& m)
在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
在 System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
在 System.Windows.Forms.Application.Run(Form mainForm)
在 MediaMarkersTools.Program.Main() 位置 D:\ProgramCode\MediaMarkersTools\MediaMarkersTools\Program.cs:行号 18
在 System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
在 System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
在 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
在 System.Threading.ThreadHelper.ThreadStart()
InnerException:


其中WMFSDK class:

using System;
using System.Runtime.InteropServices;

namespace WMFSDK
{
    public class WMFLibBase
    {
        [DllImport("WMVCore.dll", EntryPoint = "WMCreateEditor", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = true,
             CallingConvention = CallingConvention.StdCall)]
        public static extern uint WMCreateEditor(
            [Out, MarshalAs(UnmanagedType.Interface)]	out IWMMetadataEditor ppMetadataEditor);

        public WMFLibBase()
        {
            //
            // TODO: Add constructor logic here
            //
        }
    }

    [Guid("96406BD9-2B2B-11d3-B36B-00C04F6108FF"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IWMMetadataEditor
    {
        uint Open([In, MarshalAs(UnmanagedType.LPWStr)] string pwszFilename);
        uint Close();
        uint Flush();

    }

    [Guid("15CC68E3-27CC-4ecd-B222-3F5D02D80BD5"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IWMHeaderInfo3
    {
        uint GetAttributeCount(
            [In]									ushort wStreamNum,
            [Out]									out ushort pcAttributes);

        uint GetAttributeByIndex(
            [In]									ushort wIndex,
            [Out, In]								ref ushort pwStreamNum,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszName,
            [Out, In]								ref ushort pcchNameLen,
            [Out]									out WMT_ATTR_DATATYPE pType,
            [Out, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [Out, In]								ref ushort pcbLength);

        uint GetAttributeByName(
            [Out, In]								ref ushort pwStreamNum,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pszName,
            [Out]									out WMT_ATTR_DATATYPE pType,
            [Out, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [Out, In]								ref ushort pcbLength);

        uint SetAttribute(
            [In]									ushort wStreamNum,
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pszName,
            [In]									WMT_ATTR_DATATYPE Type,
            [In, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [In]									ushort cbLength);

        uint GetMarkerCount(
            [Out]									out ushort pcMarkers);

        uint GetMarker(
            [In]									ushort wIndex,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszMarkerName,
            [Out, In]								ref ushort pcchMarkerNameLen,
            [Out]									out ulong pcnsMarkerTime);

        uint AddMarker(
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pwszMarkerName,
            [In]									ulong cnsMarkerTime);

        uint RemoveMarker(
            [In]									ushort wIndex);

        uint GetScriptCount(
            [Out]									out ushort pcScripts);

        uint GetScript(
            [In]									ushort wIndex,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszType,
            [Out, In]								ref ushort pcchTypeLen,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszCommand,
            [Out, In]								ref ushort pcchCommandLen,
            [Out]									out ulong pcnsScriptTime);

        uint AddScript(
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pwszType,
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pwszCommand,
            [In]									ulong cnsScriptTime);

        uint RemoveScript(
            [In]									ushort wIndex);

        uint GetCodecInfoCount(
            [Out]									out uint pcCodecInfos);

        uint GetCodecInfo(
            [In]									uint wIndex,
            [Out, In]								ref ushort pcchName,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszName,
            [Out, In]								ref ushort pcchDescription,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszDescription,
            [Out]									out WMT_CODEC_INFO_TYPE pCodecType,
            [Out, In]								ref ushort pcbCodecInfo,
            [Out, MarshalAs(UnmanagedType.LPArray)]	byte[] pbCodecInfo);

        uint GetAttributeCountEx(
            [In]									ushort wStreamNum,
            [Out]									out ushort pcAttributes);

        uint GetAttributeIndices(
            [In]									ushort wStreamNum,
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pwszName,
            [In]									ref ushort pwLangIndex,
            [Out, MarshalAs(UnmanagedType.LPArray)] ushort[] pwIndices,
            [Out, In]								ref ushort pwCount);

        uint GetAttributeByIndexEx(
            [In]									ushort wStreamNum,
            [In]									ushort wIndex,
            [Out, MarshalAs(UnmanagedType.LPWStr)]	string pwszName,
            [Out, In]								ref ushort pwNameLen,
            [Out]									out WMT_ATTR_DATATYPE pType,
            [Out]									out ushort pwLangIndex,
            [Out, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [Out, In]								ref uint pdwDataLength);

        uint ModifyAttribute(
            [In]									ushort wStreamNum,
            [In]									ushort wIndex,
            [In]									WMT_ATTR_DATATYPE Type,
            [In]									ushort wLangIndex,
            [In, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [In]									uint dwLength);

        uint AddAttribute(
            [In]									ushort wStreamNum,
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pszName,
            [Out]									out ushort pwIndex,
            [In]									WMT_ATTR_DATATYPE Type,
            [In]									ushort wLangIndex,
            [In, MarshalAs(UnmanagedType.LPArray)]	byte[] pValue,
            [In]									uint dwLength);

        uint DeleteAttribute(
            [In]									ushort wStreamNum,
            [In]									ushort wIndex);

        uint AddCodecInfo(
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pszName,
            [In, MarshalAs(UnmanagedType.LPWStr)]	string pwszDescription,
            [In]									WMT_CODEC_INFO_TYPE codecType,
            [In]									ushort cbCodecInfo,
            [In, MarshalAs(UnmanagedType.LPArray)]	byte[] pbCodecInfo);
    }

    public enum WMT_ATTR_DATATYPE
    {
        WMT_TYPE_DWORD = 0,
        WMT_TYPE_STRING = 1,
        WMT_TYPE_BINARY = 2,
        WMT_TYPE_BOOL = 3,
        WMT_TYPE_QWORD = 4,
        WMT_TYPE_WORD = 5,
        WMT_TYPE_GUID = 6,
    }

    public enum WMT_CODEC_INFO_TYPE
    {
        WMT_CODECINFO_AUDIO = 0,
        WMT_CODECINFO_VIDEO = 1,
        WMT_CODECINFO_UNKNOWN = 0xffffff
    }
}

应该不是文件路径的问题，求高人解决，分不够再给