Question

I’m starting a project which requires reading outlook msg files in c#. I have the specs for compound documents but am having trouble reading them in c#. Any pointers would be greatly appreciated.

Thanks.

Answer 1

Here is my shot. This is an initial translation of this article.

namespace cs_console_app {     using System;     using System.Runtime.InteropServices;     using System.Runtime.InteropServices.ComTypes;      [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();     }      [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 IStream ppstm);          void OpenStream(             /* [string][in] */ string pwcsName,             /* [unique][in] */ IntPtr reserved1,             /* [in] */ uint grfMode,             /* [in] */ uint reserved2,             /* [out] */ out 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);      }      [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,     }      public enum STATFLAG : uint     {         STATFLAG_DEFAULT = 0,         STATFLAG_NONAME = 1,         STATFLAG_NOOPEN = 2     }      public enum STGTY : int     {         STGTY_STORAGE = 1,         STGTY_STREAM = 2,         STGTY_LOCKBYTES = 3,         STGTY_PROPERTY = 4     }      class Program     {         [DllImport('ole32.dll')]         private static extern int StgIsStorageFile(             [MarshalAs(UnmanagedType.LPWStr)] string pwcsName);          [DllImport('ole32.dll')]         static extern int StgOpenStorage(             [MarshalAs(UnmanagedType.LPWStr)] string pwcsName,             IStorage pstgPriority,             STGM grfMode,             IntPtr snbExclude,             uint reserved,             out IStorage ppstgOpen);          static void Main(string[] args)         {             string filename = @'f:\temp\treta2.msg';             if (StgIsStorageFile(filename) == 0)             {                 IStorage storage = null;                 if (StgOpenStorage(                     filename,                     null,                     STGM.DIRECT | STGM.READ | STGM.SHARE_EXCLUSIVE,                     IntPtr.Zero,                     0,                     out storage) == 0)                 {                     System.Runtime.InteropServices.ComTypes.STATSTG statstg;                     storage.Stat(out statstg, (uint) STATFLAG.STATFLAG_DEFAULT);                      IEnumSTATSTG pIEnumStatStg = null;                     storage.EnumElements(0, IntPtr.Zero, 0, out pIEnumStatStg);                      System.Runtime.InteropServices.ComTypes.STATSTG[] regelt = { statstg };                     uint fetched = 0;                     uint res = pIEnumStatStg.Next(1, regelt, out fetched);                      if (res == 0)                     {                         while (res != 1)                         {                             string strNode = statstg.pwcsName;                             bool bNodeFound = false;                              Console.WriteLine(strNode);                              if (strNode == '__substg1.0_0E04001E'                                 || strNode == '__substg1.0_0E1D001E'                                 || strNode == '__substg1.0_1000001E'                                 || strNode == '__substg1.0_1013001E')                             {                                 bNodeFound = true;                             }                              if (bNodeFound)                             {                                 switch (statstg.type)                                 {                                     case (int) STGTY.STGTY_STORAGE:                                         {                                             IStorage pIChildStorage;                                             storage.OpenStorage(statstg.pwcsName,                                                null,                                                (uint) (STGM.READ | STGM.SHARE_EXCLUSIVE),                                                IntPtr.Zero,                                                0,                                                out pIChildStorage);                                         }                                         break;                                     case (int) STGTY.STGTY_STREAM:                                         {                                             IStream pIStream;                                             storage.OpenStream(statstg.pwcsName,                                                IntPtr.Zero,                                                (uint)(STGM.READ | STGM.SHARE_EXCLUSIVE),                                                0,                                                out pIStream);                                              byte[] data = new byte[255];                                              pIStream.Read(data, 255, IntPtr.Zero);                                         }                                         break;                                 }                             }                              if ((res = pIEnumStatStg.Next(1, regelt, out fetched)) != 1)                             {                                 statstg = regelt[0];                             }                         }                     }                 }             }              Console.ReadLine();         }     } }