求高手赐教代码原理
第一部分：using System;
using System.Runtime.InteropServices;
using System.Text;
namespace DesktopSearch1.Parsing
{
[Flags]
public enum IFILTER_INIT : uint
{
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
}
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
}
[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);
[PreserveSig] int GetChunk(out STAT_CHUNK pStat);
[PreserveSig] int GetText(ref uint pcwcBuffer, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder 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 CFilter
{
}
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));
}
/// <summary>
/// IFilter return codes
/// </summary>
public enum IFilterReturnCodes : uint
{
/// <summary>
/// Success
/// </summary>
S_OK = 0,
/// <summary>
/// The function was denied access to the filter file.
/// </summary>
E_ACCESSDENIED = 0x80070005,
/// <summary>
/// The function encountered an invalid handle, probably due to a low-memory situation.
/// </summary>
E_HANDLE = 0x80070006,
/// <summary>
/// The function received an invalid parameter.
/// </summary>
E_INVALIDARG = 0x80070057,
/// <summary>
/// Out of memory
/// </summary>
E_OUTOFMEMORY = 0x8007000E,
/// <summary>
/// Not implemented
/// </summary>
E_NOTIMPL = 0x80004001,
/// <summary>
/// Unknown error
/// </summary>
E_FAIL = 0x80000008,
/// <summary>
/// File not filtered due to password protection
/// </summary>
FILTER_E_PASSWORD = 0x8004170B,
/// <summary>
/// The document format is not recognised by the filter
/// </summary>
FILTER_E_UNKNOWNFORMAT = 0x8004170C,
/// <summary>
/// No text in current chunk
/// </summary>
FILTER_E_NO_TEXT = 0x80041705,
/// <summary>
/// No more chunks of text available in object
/// </summary>
FILTER_E_END_OF_CHUNKS = 0x80041700,
/// <summary>
/// No more text available in chunk
/// </summary>
FILTER_E_NO_MORE_TEXT = 0x80041701,
/// <summary>
/// No more property values available in chunk
/// </summary>
FILTER_E_NO_MORE_VALUES = 0x80041702,
/// <summary>
/// Unable to access object
/// </summary>
FILTER_E_ACCESS = 0x80041703,
/// <summary>
/// Moniker doesn't cover entire region
/// </summary>
FILTER_W_MONIKER_CLIPPED = 0x00041704,
/// <summary>
/// Unable to bind IFilter for embedded object
/// </summary>
FILTER_E_EMBEDDING_UNAVAILABLE = 0x80041707,
/// <summary>
/// Unable to bind IFilter for linked object
/// </summary>
FILTER_E_LINK_UNAVAILABLE = 0x80041708,
/// <summary>
/// This is the last text in the current chunk
/// </summary>
FILTER_S_LAST_TEXT = 0x00041709,
/// <summary>
/// This is the last value in the current chunk
/// </summary>
FILTER_S_LAST_VALUES = 0x0004170A
}
}
--------------------编程问答--------------------
第二部分：
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace DesktopSearch1.Parsing
{
/// <summary>
/// Summary description for Parser.
/// </summary>
public class Parser
{
public Parser()
{
}
[DllImport("query.dll", CharSet = CharSet.Unicode)]
private extern static int LoadIFilter (string pwcsPath, ref IUnknown pUnkOuter, ref IFilter ppIUnk);
[ComImport, Guid("00000000-0000-0000-C000-000000000046")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IUnknown
{
[PreserveSig]
IntPtr QueryInterface( ref Guid riid, out IntPtr pVoid );
[PreserveSig]
IntPtr AddRef();
[PreserveSig]
IntPtr Release();
}
private static IFilter loadIFilter(string filename)
{
IUnknown iunk = null;
IFilter filter = null;
// Try to load the corresponding IFilter
int resultLoad = LoadIFilter( filename, ref iunk, ref filter );
if (resultLoad != (int)IFilterReturnCodes.S_OK)
{
return null;
}
return filter;
}
/*
private static IFilter loadIFilterOffice(string filename)
{
IFilter filter = (IFilter)(new CFilter());
System.Runtime.InteropServices.UCOMIPersistFile ipf = (System.Runtime.InteropServices.UCOMIPersistFile)(filter);
ipf.Load(filename, 0);
return filter;
}
*/
public static bool IsParseable(string filename)
{
return loadIFilter(filename) != null;
}
public static string Parse(string filename)
{
IFilter filter = null;
try
{
StringBuilder plainTextResult = new StringBuilder();
filter = loadIFilter(filename);
STAT_CHUNK ps = new STAT_CHUNK();
IFILTER_INIT mFlags = 0;
uint i = 0;
filter.Init( mFlags, 0, null, ref i);
int resultChunk = 0;
resultChunk = filter.GetChunk(out ps);
while (resultChunk == 0)
{
if (ps.flags == CHUNKSTATE.CHUNK_TEXT)
{
uint sizeBuffer = 60000;
int resultText = 0;
while (resultText == Constants.FILTER_S_LAST_TEXT || resultText == 0)
{
sizeBuffer = 60000;
System.Text.StringBuilder sbBuffer = new System.Text.StringBuilder((int)sizeBuffer);
resultText = filter.GetText(ref sizeBuffer, sbBuffer);
if (sizeBuffer > 0 && sbBuffer.Length > 0)
{
string chunk = sbBuffer.ToString(0, (int)sizeBuffer);
plainTextResult.Append(chunk);
}
}
}
resultChunk = filter.GetChunk(out ps);
}
return plainTextResult.ToString();
}
finally
{
if (filter != null)
Marshal.ReleaseComObject(filter);
}
}
}
}
--------------------编程问答-------------------- 跪求 --------------------编程问答-------------------- 跪求ing --------------------编程问答-------------------- 参考
参考
--------------------编程问答-------------------- 跪求！！！
补充：.NET技术 , C#
