c# - 如何以自动方式将 OLEObject 的内容保存为文件？

Question

我正在向 PowerPoint 中的幻灯片添加一些不同的文件类型。这些类型包括 mp4、zip、swf 和其他格式。我不是在寻找一种方法来播放这些文件类型；但是，我想在 powerpoint preso 中存储和检索文件。

我通过执行以下操作成功地存储了这些不同的文件类型:

currentSlide.Shapes.AddOLEObject(0, 0, -1, -1, "", this.filePath);

我还可以通过右键单击对象 -> 选择编辑包 -> 文件 -> 保存内容来手动检索它们。

我正在寻找复制或使用此功能将 OLEObject 的内容保存回其原始状态和我指定的路径。我有办法找到那个形状，我认为这个对象包含以下内容:slideShape.OLEFormat.Object我只是不知道现在该做什么。想法？谢谢。

哦，我使用的是 Office 2010，如果这有什么不同的话。

Answer 1

所以，我知道这已经晚了；但是，我知道其他人一定有类似的问题。

我就此问题联系了 Microsoft，他们花了大约一个月左右的时间，但他们终于给了我答复。我有一个 zip of the solution .它相当广泛，请查看下面的纯源代码。

首先是一些说明:

1) 创建一个 PowerPoint 演示文稿并在其中嵌入一些文件(视频、mp3、zip 等)
2) 将文件保存到以下位置 C:\Temp\Temp.pptx
3) 关闭文件
4) 在“C:\Temp”下创建文件夹“GeneratedFiles”
5) 打开应用程序并运行它。

所以唯一的缺点就是必须关闭PPTX文件。话虽如此，人们也许能够将打开的 PPTX 文件复制到别处，然后从该位置提取文件，而不是从实际正在处理的 PPTX 中提取文件。然后删除临时的。我们会看到。这与此解决方案一样接近。

没有进一步的告别:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO.Packaging;
using System.Runtime.InteropServices;
using System.IO;

namespace ExtractOLEPowerPoint
{
class Program
{

    #region IEnumSTATSTG
    [ComImport]
    [Guid("0000000d-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IEnumSTATSTG
    {
        // The user needs to allocate an STATSTG array whose size is celt.
        [PreserveSig]
        uint Next(uint celt, [MarshalAs(UnmanagedType.LPArray), Out] System.Runtime.InteropServices.ComTypes.STATSTG[] rgelt, out uint pceltFetched);

        void Skip(uint celt);

        void Reset();

        [return: MarshalAs(UnmanagedType.Interface)]
        IEnumSTATSTG Clone();
    }
    #endregion

    //#region IStream

    //[ComImport, Guid("0000000c-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    //public interface IStream
    //{
    //    void Read([Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, uint cb, out uint pcbRead);
    //    void Write([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pv, uint cb, out uint pcbWritten);
    //    void Seek(long dlibMove, uint dwOrigin, out long plibNewPosition);
    //    void SetSize(long libNewSize);
    //    void CopyTo(IStream pstm, long cb, out long pcbRead, out long pcbWritten);
    //    void Commit(uint grfCommitFlags);
    //    void Revert();
    //    void LockRegion(long libOffset, long cb, uint dwLockType);
    //    void UnlockRegion(long libOffset, long cb, uint dwLockType);
    //    void Stat(out STATSTG pstatstg, uint grfStatFlag);
    //    void Clone(out IStream ppstm);
    //}

    //#endregion

    #region STATFLAG

    [Flags]
    public enum STATFLAG : uint
    {
        STATFLAG_DEFAULT = 0,
        STATFLAG_NONAME = 1,
        STATFLAG_NOOPEN = 2
    }

    #endregion

    #region IStorage
    [ComImport]
    [Guid("0000000b-0000-0000-C000-000000000046")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface IStorage
    {
        void CreateStream(
            /* [string][in] */ string pwcsName,
            /* [in] */ uint grfMode,
            /* [in] */ uint reserved1,
            /* [in] */ uint reserved2,
            /* [out] */ out System.Runtime.InteropServices.ComTypes.IStream ppstm);
        void OpenStream(
            /* [string][in] */ string pwcsName,
            /* [unique][in] */ IntPtr reserved1,
            /* [in] */ uint grfMode,
            /* [in] */ uint reserved2,
            /* [out] */ out System.Runtime.InteropServices.ComTypes.IStream ppstm);

        void CreateStorage(
            /* [string][in] */ string pwcsName,
            /* [in] */ uint grfMode,
            /* [in] */ uint reserved1,
            /* [in] */ uint reserved2,
            /* [out] */ out IStorage ppstg);

        void OpenStorage(
            /* [string][unique][in] */ string pwcsName,
            /* [unique][in] */ IStorage pstgPriority,
            /* [in] */ uint grfMode,
            /* [unique][in] */ IntPtr snbExclude,
            /* [in] */ uint reserved,
            /* [out] */ out IStorage ppstg);

        void CopyTo(
            /* [in] */ uint ciidExclude,
            /* [size_is][unique][in] */ Guid rgiidExclude, // should this be an array?
            /* [unique][in] */ IntPtr snbExclude,
            /* [unique][in] */ IStorage pstgDest);

        void MoveElementTo(
            /* [string][in] */ string pwcsName,
            /* [unique][in] */ IStorage pstgDest,
            /* [string][in] */ string pwcsNewName,
            /* [in] */ uint grfFlags);

        void Commit(
            /* [in] */ uint grfCommitFlags);

        void Revert();

        void EnumElements(
            /* [in] */ uint reserved1,
            /* [size_is][unique][in] */ IntPtr reserved2,
            /* [in] */ uint reserved3,
            /* [out] */ out IEnumSTATSTG ppenum);

        void DestroyElement(
            /* [string][in] */ string pwcsName);

        void RenameElement(
            /* [string][in] */ string pwcsOldName,
            /* [string][in] */ string pwcsNewName);

        void SetElementTimes(
            /* [string][unique][in] */ string pwcsName,
            /* [unique][in] */ System.Runtime.InteropServices.ComTypes.FILETIME pctime,
            /* [unique][in] */ System.Runtime.InteropServices.ComTypes.FILETIME patime,
            /* [unique][in] */ System.Runtime.InteropServices.ComTypes.FILETIME pmtime);

        void SetClass(
            /* [in] */ Guid clsid);

        void SetStateBits(
            /* [in] */ uint grfStateBits,
            /* [in] */ uint grfMask);

        void Stat(
            /* [out] */ out System.Runtime.InteropServices.ComTypes.STATSTG pstatstg,
            /* [in] */ uint grfStatFlag);
    }

    #endregion

    #region STGM
    [Flags]
    public enum STGM : int
    {
        DIRECT           = 0x00000000,
        TRANSACTED       = 0x00010000,
        SIMPLE           = 0x08000000,
        READ             = 0x00000000,
        WRITE            = 0x00000001,
        READWRITE        = 0x00000002,
        SHARE_DENY_NONE  = 0x00000040,
        SHARE_DENY_READ  = 0x00000030,
        SHARE_DENY_WRITE = 0x00000020,
        SHARE_EXCLUSIVE  = 0x00000010,
        PRIORITY         = 0x00040000,
        DELETEONRELEASE  = 0x04000000,
        NOSCRATCH        = 0x00100000,
        CREATE           = 0x00001000,
        CONVERT          = 0x00020000,
        FAILIFTHERE      = 0x00000000,
        NOSNAPSHOT       = 0x00200000,
        DIRECT_SWMR      = 0x00400000,
    }

    #endregion

    #region StgIsStorageFile

    [DllImport("Ole32.dll")]
    static extern int StgIsStorageFile([MarshalAs(UnmanagedType.LPWStr)]string filename);

    #endregion

    #region StgOpenStorage

    [DllImport("Ole32.dll")]
    static extern int StgOpenStorage([MarshalAs(UnmanagedType.LPWStr)]string pwcsName, IStorage pstgPriority, STGM grfmode, IntPtr snbExclude, uint researved, out IStorage ppstgOpen);

    #endregion

    static void Main(string[] args)
    {
        Package pkg = Package.Open("C:\\Temp\\Temp.pptx");
        foreach (PackagePart pkgprt in pkg.GetParts())
        {
            if(pkgprt.Uri.ToString().StartsWith("/ppt/embeddings/"))
            {
                System.IO.Stream strm = pkgprt.GetStream();
                byte[] buffer = new byte[strm.Length];
                strm.Read(buffer, 0, (int)strm.Length);
                strm.Close();

                // Create a temporary file
                string targetFile = "C:\\Temp\\GeneratedFiles\\" + pkgprt.Uri.ToString().Remove(0, "/ppt/embeddings/".Length);
                System.IO.File.WriteAllBytes(targetFile, buffer);

                // Extract the contents.
                IStorage Is;
                StgOpenStorage(targetFile, null, STGM.READWRITE | STGM.SHARE_EXCLUSIVE, IntPtr.Zero, 0, out Is);
                ProcessPackage(Is);

                // Need to release the IStorage object and call GC.Collect() to free the object
                Marshal.ReleaseComObject(Is);
                Is = null;
                GC.Collect();
                GC.WaitForPendingFinalizers();

                // Delete the temporary binary file extracted
                File.Delete(targetFile);
            }
        }
    }
    static void ProcessPackage(IStorage pStg)
    {
        System.Runtime.InteropServices.ComTypes.IStream pStream;
        IEnumSTATSTG pEnumStatStg;
        uint numReturned;
        pStg.EnumElements(0, IntPtr.Zero, 0, out pEnumStatStg);
        System.Runtime.InteropServices.ComTypes.STATSTG[] ss = new System.Runtime.InteropServices.ComTypes.STATSTG[1];
        // Loop through the STATSTG structures in the storage.
        do
        {
            // Retrieve the STATSTG structure
            pEnumStatStg.Next(1, ss, out numReturned);
            if (numReturned != 0)
            {
                //System.Runtime.InteropServices.ComTypes.STATSTG statstm;
                byte[] bytT = new byte[4];
                // Check if the pwcsName contains "Ole10Native" stream which contain the actual embedded object
                if (ss[0].pwcsName.Contains("Ole10Native") == true)
                {
                    // Get the stream objectOpen the stream
                    pStg.OpenStream(ss[0].pwcsName, IntPtr.Zero, (uint)STGM.READ | (uint)STGM.SHARE_EXCLUSIVE, 0, out pStream);
                    //pStream.Stat(out statstm, (int) STATFLAG.STATFLAG_DEFAULT);

                    IntPtr position = IntPtr.Zero;
                    // File name starts from 7th Byte.
                    // Position the cursor to the 7th Byte.
                    pStream.Seek(6, 0, position);

                    IntPtr ulRead = new IntPtr();
                    char[] filename = new char[260];
                    int i;

                    // Read the File name of the embedded object
                    for (i = 0; i < 260; i++)
                    {
                        pStream.Read(bytT, 1, ulRead);
                        pStream.Seek(0, 1, position);
                        filename[i] = (char)bytT[0];
                        if (bytT[0] == 0)
                        {
                            break;
                        }
                    }
                    string path = new string(filename, 0, i);

                    // Next part is the source path of the embedded object.
                    // Length is unknown. Hence, loop through each byte to read the 0 terminated string
                    // Read the source path.
                    for (i = 0; i < 260; i++)
                    {
                        pStream.Read(bytT, 1, ulRead);
                        pStream.Seek(0, 1, position);
                        filename[i] = (char)bytT[0];
                        if (bytT[0] == 0)
                        {
                            break;
                        }
                    }
                    // Source File path
                    string fullpath = new string(filename, 0, i);

                    // Unknown 4 bytes
                    pStream.Seek(4, 1, position);

                    // Next 4 byte gives the length of the temporary file path 
                    // (Office uses a temporary location to copy the files before inserting to the document)
                    // The length is in little endian format. Hence conversion is needed
                    pStream.Read(bytT, 4, ulRead);
                    ulong dwSize, dwTemp;
                    dwSize = 0;
                    dwTemp = (ulong)bytT[3];
                    dwSize += (ulong)(bytT[3] << 24);
                    dwSize += (ulong)(bytT[2] << 16);
                    dwSize += (ulong)(bytT[1] << 8);
                    dwSize += bytT[0];

                    // Skip the temporary file path
                    pStream.Seek((long)dwSize, 1, position);

                    // Next four bytes gives the size of the actual data in little endian format.
                    // Convert the format.
                    pStream.Read(bytT, 4, ulRead);
                    dwTemp = 0;
                    dwSize = 0;
                    dwTemp = (ulong)bytT[3];
                    dwSize += (ulong)(bytT[3] << 24);
                    dwSize += (ulong)(bytT[2] << 16);
                    dwSize += (ulong)(bytT[1] << 8);
                    dwSize += (ulong)bytT[0];

                    // Read the actual file content 
                    byte[] byData = new byte[dwSize];
                    pStream.Read(byData, (int)dwSize, ulRead);

                    // Create the file
                    System.IO.BinaryWriter bWriter = new System.IO.BinaryWriter(System.IO.File.Open("C:\\temp\\GeneratedFiles\\" + path, System.IO.FileMode.Create));
                    bWriter.Write(byData);
                    bWriter.Close();
                }
            }
        }
        while (numReturned > 0);
    }
}
}