我要开始一个需要在c#中读取outlook msg文件的项目。我有复合文档的规范，但在c#中读取时遇到了困难。如果有任何指针或建议，将不胜感激。
谢谢。
谢谢。
2个回答
13
这是我的译文。这是该文章的初步翻译。
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();
}
}
}
- smink
3
1哇，这绝对是我在SO上读过的最好的回答之一。但是以这种形式它工作不正常：它每次只打印文件名。
为了使事情顺利进行，我不得不在“while（res！=1）”循环的末尾添加“statstg = regelt [0];”在“res = pIEnumStatStg.Next（1，regelt，out fetched）;”之后。 - Inno
1在这里，如果你不想泄漏内存，你需要释放一些COM对象：使用Marshal.ReleaseComObject(IStorage)。我认为你还需要释放IEnumSTATSTG。 - toong
@toong：不要释放COM对象！https://devblogs.microsoft.com/visualstudio/marshal-releasecomobject-considered-dangerous/ -- 然而，一旦Next方法将STATSTG结构记录检索到oElement数组中，结构记录的pwcsName字段提供了它的名称是由OLE分配内存的。释放它是用户的责任。 - user1889116
1
Outlook Interop。虽然我从未使用过Outlook互操作，但您应该能够使用它打开电子邮件消息。
MailItem Interface应该是您需要访问它的接口。
此外，请确保在完成后释放com references。
- MagicKat
网页内容由stack overflow 提供, 点击上面的可以查看英文原文，
原文链接
原文链接