ドキュメントからテキストのみを抽出する
先日の修正版
http://d.hatena.ne.jp/m-tanaka/20080129
FilterがNULL文字列を返却したさいに、StringBuilderだとうまく扱えないので、少し修正
//参考
//http://sqljunkies.com/HowTo/C4AC6E97-8D84-411D-8551-08CE63EC99B6.scuk
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace Yuki
{
[Flags]
public enum IFILTER_INIT
{
NONE = 0,
CANON_PARAGRAPHS = 1,
HARD_LINE_BREAKS = 2,
CANON_HYPHENS = 4,
CANON_SPACES = 8,
APPLY_INDEX_ATTRIBUTES = 16,
APPLY_CRAWL_ATTRIBUTES = 256,
APPLY_OTHER_ATTRIBUTES = 32,
INDEXING_ONLY = 64,
SEARCH_LINKS = 128,
FILTER_OWNED_VALUE_OK = 512
}
[Flags]
public enum IFILTER_FLAGS
{
OLE_PROPERTIES = 1
}
public enum CHUNK_BREAKTYPE
{
CHUNK_NO_BREAK = 0,
CHUNK_EOW = 1,
CHUNK_EOS = 2,
CHUNK_EOP = 3,
CHUNK_EOC = 4
}
[Flags]
public enum CHUNKSTATE
{
CHUNK_TEXT = 0x1,
CHUNK_VALUE = 0x2,
CHUNK_FILTER_OWNED_VALUE = 0x4
}
public enum PSKIND
{
LPWSTR = 0,
PROPID = 1
}
[StructLayout(LayoutKind.Sequential)]
public struct PROPSPEC
{
public uint ulKind;
public uint propid;
public IntPtr lpwstr;
}
[StructLayout(LayoutKind.Sequential)]
public struct FULLPROPSPEC
{
public Guid guidPropSet;
public PROPSPEC psProperty;
}
[StructLayout(LayoutKind.Sequential)]
public struct STAT_CHUNK
{
public uint idChunk;
[MarshalAs(UnmanagedType.U4)] public CHUNK_BREAKTYPE breakType;
[MarshalAs(UnmanagedType.U4)] public CHUNKSTATE flags;
public uint locale;
[MarshalAs(UnmanagedType.Struct)] public FULLPROPSPEC attribute;
public uint idChunkSource;
public uint cwcStartSource;
public uint cwcLenSource;
}
[StructLayout(LayoutKind.Sequential)]
public struct FILTERREGION
{
public uint idChunk;
public uint cwcStart;
public uint cwcExtent;
}
[ComImport]
[Guid("89BCB740-6119-101A-BCB7-00DD010655AF")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IFilter
{
void Init([MarshalAs(UnmanagedType.U4)] IFILTER_INIT grfFlags,
uint cAttributes,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex=1)] FULLPROPSPEC[] aAttributes,
ref uint pdwFlags);
//void GetChunk([MarshalAs(UnmanagedType.Struct)] out STAT_CHUNK pStat);
[PreserveSig] int GetChunk([MarshalAs(UnmanagedType.Struct)] out STAT_CHUNK pStat);
//[PreserveSig] int GetText(ref uint pcwcBuffer, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder buffer);
[PreserveSig] int GetText(ref uint pcwcBuffer, [MarshalAs(UnmanagedType.LPArray)] byte[] buffer);
void GetValue(ref UIntPtr ppPropValue);
void BindRegion([MarshalAs(UnmanagedType.Struct)]FILTERREGION origPos, ref Guid riid, ref UIntPtr ppunk);
}
[ComImport]
[Guid("f07f3920-7b8c-11cf-9be8-00aa004b9986")]
public class OfficeFilter
{
}
[ComImport]
[Guid("4c904448-74a9-11d0-af6e-00c04fd8dc02")]
public class PDFFilter
{
}
[ComImport]
[Guid("faea5b46-761b-400e-b53e-e805a97a543e")]
public class VisioFilter
{
}
[ComImport]
[Guid("e0ca5340-4534-11cf-b952-00aa0051fe20")]
public class HtmlFilter
{
}
[ComImport]
[Guid("c1243ca0-bf96-11cd-b579-08002b30bfeb")]
public class PlainTextFilter
{
}
public class Constants
{
public const uint PID_STG_DIRECTORY =0x00000002;
public const uint PID_STG_CLASSID =0x00000003;
public const uint PID_STG_STORAGETYPE =0x00000004;
public const uint PID_STG_VOLUME_ID =0x00000005;
public const uint PID_STG_PARENT_WORKID =0x00000006;
public const uint PID_STG_SECONDARYSTORE =0x00000007;
public const uint PID_STG_FILEINDEX =0x00000008;
public const uint PID_STG_LASTCHANGEUSN =0x00000009;
public const uint PID_STG_NAME =0x0000000a;
public const uint PID_STG_PATH =0x0000000b;
public const uint PID_STG_SIZE =0x0000000c;
public const uint PID_STG_ATTRIBUTES =0x0000000d;
public const uint PID_STG_WRITETIME =0x0000000e;
public const uint PID_STG_CREATETIME =0x0000000f;
public const uint PID_STG_ACCESSTIME =0x00000010;
public const uint PID_STG_CHANGETIME =0x00000011;
public const uint PID_STG_CONTENTS =0x00000013;
public const uint PID_STG_SHORTNAME =0x00000014;
public const int FILTER_E_END_OF_CHUNKS =(unchecked((int)0x80041700));
public const int FILTER_E_NO_MORE_TEXT =(unchecked((int)0x80041701));
public const int FILTER_E_NO_MORE_VALUES =(unchecked((int)0x80041702));
public const int FILTER_E_NO_TEXT =(unchecked((int)0x80041705));
public const int FILTER_E_NO_VALUES =(unchecked((int)0x80041706));
public const int FILTER_S_LAST_TEXT =(unchecked((int)0x00041709));
}
}
using System;
using System.Collections;
using System.IO;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Text;
namespace Yuki
{
[ComVisible(false)]
public class FilterFactory
{
private static Hashtable filterMap;
static FilterFactory()
{
filterMap = new Hashtable();
filterMap.Add(".doc",typeof(OfficeFilter));
filterMap.Add(".xls", typeof(OfficeFilter));
filterMap.Add(".ppt", typeof(OfficeFilter));
filterMap.Add(".vsd", typeof(VisioFilter));
filterMap.Add(".pdf", typeof(PDFFilter));
filterMap.Add(".htm", typeof(HtmlFilter));
filterMap.Add(".html", typeof(PDFFilter));
}
private FilterFactory()
{
}
public static IFilter GetInstance(string filePath)
{
if (filePath == null || filePath ==string.Empty)
{
throw new ArgumentNullException();
}
FileInfo fi = new FileInfo(filePath);
if (!fi.Exists)
{
throw new ArgumentException();
}
Type t = null;
object typeobject = filterMap[fi.Extension.ToLower()];
if(typeobject != null)
{
t = (Type) typeobject;
}
else
{
t = typeof(PlainTextFilter);
}
object o = t.GetConstructor(new Type[0]).Invoke(new object[0]);
IFilter filter = (IFilter)o;
UCOMIPersistFile ipf = (UCOMIPersistFile) filter;
ipf.Load(filePath, 0);
return filter;
}
}
}
using System;
using System.Collections;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
namespace Yuki
{
[ComVisible(false)]
public class FilterUtil
{
private FilterUtil()
{ }
public static string GetText(IFilter filter)
{
StringBuilder sbResult = new StringBuilder();
uint i = 0;
STAT_CHUNK ps = new STAT_CHUNK();
//filter.Init(0, 0, null, ref i);
filter.Init(IFILTER_INIT.CANON_SPACES
| IFILTER_INIT.CANON_HYPHENS
| IFILTER_INIT.CANON_PARAGRAPHS
| IFILTER_INIT.HARD_LINE_BREAKS
| IFILTER_INIT.APPLY_INDEX_ATTRIBUTES , 0, null, ref i);
int hr = 0;//HRESULT
while (hr == 0)
{
hr = filter.GetChunk(out ps);
if (ps.flags == CHUNKSTATE.CHUNK_TEXT)
{
uint pcwcBuffer = 1000;
int hr2 = 0;
while (hr2 == Constants.FILTER_S_LAST_TEXT || hr2 == 0)
{
pcwcBuffer = 1000;
byte[] buffer = new byte[pcwcBuffer];
hr2 = filter.GetText(ref pcwcBuffer, buffer);
if (hr2 != Constants.FILTER_E_NO_TEXT && hr2 != Constants.FILTER_E_NO_MORE_TEXT)
{
if(buffer.Length < pcwcBuffer)
{
pcwcBuffer = (uint)buffer.Length;
}
char[] chars = new char[1000];
for(int j = 0; j < buffer.Length; j= j+2)
{
chars[j/2] = BitConverter.ToChar(buffer,j);
}
string text = new string(chars,0,(int)pcwcBuffer);
sbResult.Append(text);
}
}
}
}
return sbResult.ToString();
}
}
}
