通过OleCreateFromFile在C#中调用OLE对pdf文件无效

我正在尝试将pdf文件嵌入到OPEN XML文档中。这需要创建*.bin文件。我不想使用自动化。

我从这个问题中得到的方法适用于我测试的所有文件类型，除了*.pdf.

由于某些原因，pdf文件总是从OleCreateFromFile（..）获得0x80004005的结果，并且pOle为NULL。

我是调用和OLE领域的新手。这种方法不适用于PDF的原因是什么？（我有最新的Adobe Reader，Win8，调用到Ole32.dll，项目构建目标是x86，我测试调用CoUninitialize（）和CoInitializeEx（（System.IntPtr）null，Ole32.CoInit.ApartmentThreaded），我可以在MSWORD应用程序中嵌入pdf文件）。

这是我为它使用的一个函数：

public static string ExportOleFile(string _inputFileName, string oleOutputFileName, string emfOutputFileName)
        {
            StringBuilder resultString = new StringBuilder();           
            string newInput = MultibyteToUnicodeNETOnly(_inputFileName, 1252);
            Microsoft.VisualStudio.OLE.Interop.IStorage storage;
            var result = OLE32.StgCreateStorageEx(oleOutputFileName,
                Convert.ToInt32(OLE32.STGM.STGM_READWRITE | OLE32.STGM.STGM_SHARE_EXCLUSIVE | OLE32.STGM.STGM_CREATE | OLE32.STGM.STGM_TRANSACTED),
                Convert.ToInt32(OLE32.STGFMT.STGFMT_DOCFILE),
                0,
                IntPtr.Zero,
                IntPtr.Zero,
                ref OLE32.IID_IStorage,
                out storage
            );//vytvoří bin
            resultString.AppendLine("CreateStorageEx Result: " + result.ToString());
            var CLSID_NULL = Guid.Empty;

            Microsoft.VisualStudio.OLE.Interop.FORMATETC f = new FORMATETC();
            Microsoft.VisualStudio.OLE.Interop.IOleObject pOle;
            result = OLE32.OleCreateFromFile(
                ref CLSID_NULL,
                newInput,
                ref OLE32.IID_IOleObject,
                (uint)Microsoft.VisualStudio.OLE.Interop.OLERENDER.OLERENDER_NONE,
                ref f,
                null,
                storage,
                out pOle
            );
            resultString.AppendLine("OleCreateFromFile Result: " + result.ToString());
            try
            {
                result = OLE32.OleRun(pOle);
            }
            catch (Exception ex)
            {
                resultString.AppendLine(ex.ToString());
                return resultString.ToString();
            }
            resultString.AppendLine("OleRun Result: " + result.ToString());
            try
            {
                IntPtr unknownFromOle = Marshal.GetIUnknownForObject(pOle);
                IntPtr unknownForDataObj;
                Marshal.QueryInterface(unknownFromOle, ref OLE32.IID_IDataObject, out unknownForDataObj);
                var pdo = Marshal.GetObjectForIUnknown(unknownForDataObj) as System.Runtime.InteropServices.ComTypes.IDataObject;
                var fetc = new System.Runtime.InteropServices.ComTypes.FORMATETC();
                fetc.cfFormat = (short)OLE32.CLIPFORMAT.CF_ENHMETAFILE;
                fetc.dwAspect = System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT;
                fetc.lindex = -1;
                fetc.ptd = IntPtr.Zero;
                fetc.tymed = System.Runtime.InteropServices.ComTypes.TYMED.TYMED_ENHMF;
                var stgm = new System.Runtime.InteropServices.ComTypes.STGMEDIUM();
                stgm.unionmember = IntPtr.Zero;
                stgm.tymed = System.Runtime.InteropServices.ComTypes.TYMED.TYMED_ENHMF;
                pdo.GetData(ref fetc, out stgm);
                var hemf = GDI32.CopyEnhMetaFile(stgm.unionmember, emfOutputFileName);
                storage.Commit((int)OLE32.STGC.DEFAULT);
                pOle.Close(0);
                GDI32.DeleteEnhMetaFile(stgm.unionmember);
                GDI32.DeleteEnhMetaFile(hemf);
            }
            catch (Exception ex)
            {
                resultString.AppendLine(ex.ToString());
                return resultString.ToString();
            }         
            return resultString.ToString();
        }