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using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Text;
/*
* To use the tagging of data types, the Chunk type (PropID) is the
* propid from the schema.txt file; e.g.
* "D5CDD505-2E9C-101B-9397-08002B2CF9AE/PerceivedType" for
* "Perceived Type".
* Then GetValue() returns one string from the list of:
* contact communications communications/e-mail communications/calendar communications/task
* communications/im document/note document document/text document/spreadsheet document/presentation
* music images images/picture images/video folder favorite program
*
* Note also that the acceptable attributes (FULLPROPSPEC property sets)
* are passed into aAttributes via Init(), if cAttributes is non-zero.
*/
namespace IFilterPicture
{
/// <summary>
/// The IFilter and IPersistFile interfaces, and some support structure
/// for the File Filter (Extractor)
/// </summary>
[ComVisible(true), Guid("78BD7653-D16A-43ad-B119-7080D635F27E")]
public class IFilterPicture : IPersistFile, IFilter
{
private static string myGuid = "78BD7653-D16A-43ad-B119-7080D635F27E"; /// <summary>For convenience, GUID in a string</summary>
//private static string myHandlerGUID = "{60995D18-5F02-4196-B618-5D9C2A6ABC9D}"; /// <summary>We don't use this here, but it's needed for the registry.</summary>
private bool bApplyIndexAttributes = false;
private bool bCrawlAttributes = false;
private bool bApplyOther = false;
private bool doneFirstChunk = false;
private string currentFileName = string.Empty;
private int iChunkCount = 0;
private const uint LANGUAGE_FR = 0x040C;
private string text;
public IFilterPicture()
{
#if DEBUG
_writeLog("On construit IFilterPicture()");
#endif
}
// IFilter Methods
/// <summary>Initializes a filtering session.</summary>
/// <param name="grfFlags">What processing to perform</param>
/// <param name="cAttributes">How many Attribute elements are in the aAttributes array, may be 0</param>
/// <param name="aAttributes">Attributes to process</param>
/// <param name="pdwFlags"></param>
public void Init([MarshalAs(UnmanagedType.U4)] IFILTER_INIT grfFlags, uint cAttributes, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] FULLPROPSPEC[] aAttributes, ref uint pdwFlags)
{
#if DEBUG
_writeLog("On entre dans Init()");
#endif
bApplyIndexAttributes = ((grfFlags & IFILTER_INIT.APPLY_INDEX_ATTRIBUTES) == IFILTER_INIT.APPLY_INDEX_ATTRIBUTES);
bCrawlAttributes = ((grfFlags & IFILTER_INIT.APPLY_CRAWL_ATTRIBUTES) == IFILTER_INIT.APPLY_CRAWL_ATTRIBUTES);
bApplyOther = ((grfFlags & IFILTER_INIT.APPLY_OTHER_ATTRIBUTES) == IFILTER_INIT.APPLY_OTHER_ATTRIBUTES);
#if DEBUG
_writeLog("On sort de Init()");
#endif
}
/// <summary>
/// Loads the first chunk or sets the pointers to zero on fail
/// </summary>
/// <returns></returns>
private bool getFirstChunk()
{
#if DEBUG
_writeLog("On entre dans getFirstChunk()");
#endif
if ((currentFileName == null) || (File.Exists(currentFileName) == false))
{
currentFileName = "";
#if DEBUG
_writeLog("On n'a pas de fichier à indexer (?)");
_writeLog("On sort de getFirstChunk()");
#endif
return false;
}
#if DEBUG
_writeLog(string.Format("On index le fichier {0}", currentFileName));
#endif
try
{
TesseractOCR tess = new TesseractOCR(Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(IFilterPicture)).Location) + @"\tesseract.exe");
text = tess.OCRFromFile(currentFileName);
}
catch (Exception e)
{
#if DEBUG
_writeLog(string.Format("Erreur : {0}", e.Message));
#endif
text = "crashed";
}
#if DEBUG
_writeLog("On sort de getFirstChunk()");
#endif
return true;
}
/// <summary>The IFilter::GetChunk method positions the filter at the beginning of the next chunk, or at the first chunk if this is the first call to the GetChunk method, and returns a description of the current chunk.</summary>
/// <remarks>Each chunk might be tiny; the file extractor (filter) decides.
/// Note that Chunk ID 0 is invalid; must start at 1.</remarks>
/// <param name="pStat">STAT_CHUNK pointer</param>
[PreserveSig]
public int GetChunk(out STAT_CHUNK pStat)
{
#if DEBUG
_writeLog("On entre dans GetChunk()");
#endif
bool bSuccess = true;
STAT_CHUNK myStat = new STAT_CHUNK();
pStat = myStat;
pStat.locale = LANGUAGE_FR;
iChunkCount++;
pStat.idChunk = (uint)iChunkCount;
if (iChunkCount == 2)
{
#if DEBUG
_writeLog("On sort de GetChunk()");
#endif
return Constants.FILTER_E_END_OF_CHUNKS;
}
if (!doneFirstChunk)
{
#if DEBUG
_writeLog("!doneFirstChunk");
#endif
doneFirstChunk = true;
bSuccess = getFirstChunk();
}
if (!bSuccess)
{
#if DEBUG
_writeLog("!bSuccess");
_writeLog("On sort de GetChunk() avec le message Constants.FILTER_E_END_OF_CHUNKS");
#endif
return Constants.FILTER_E_END_OF_CHUNKS;
}
pStat.flags = CHUNKSTATE.CHUNK_TEXT;
pStat.attribute.guidPropSet = new Guid(0xb725f130, 0x47ef, 0x101a, 0xa5, 0xf1, 0x02, 0x60, 0x8c, 0x9e, 0xeb, 0xac);
pStat.attribute.psProperty.ulKind = (int)PSKIND.PROPID;
pStat.attribute.psProperty.propid = Constants.PID_STG_CONTENTS;
pStat.idChunkSource = pStat.idChunk;
pStat.breakType = CHUNK_BREAKTYPE.CHUNK_EOC;
pStat.cwcStartSource = 0;
#if DEBUG
_writeLog("On sort de GetChunk() avec le message Constants.FILTER_E_END_OF_CHUNKS");
#endif
return Constants.S_OK;
}
/// <summary>Gets the text from this chunk of type CHUNK_TEXT</summary>
/// <param name="pcwcBuffer">Size of input buffer in UNICODE characters; fill with output size in CHARACTERS</param>
/// <param name="buffer">Null-terminated UNICODE string of the text.</param>
/// <returns></returns>
/// <remarks>This is called repeatedly INSIDE THE ONE CHUNK until all the text
/// is delivered.</remarks>
[PreserveSig]
public int GetText(ref int pcwcBuffer, IntPtr buffer)
{
#if DEBUG
_writeLog("On entre dans GetText()");
#endif
pcwcBuffer = text.Length;
Marshal.Copy(text.ToCharArray(), 0, buffer, text.Length);
#if DEBUG
_writeLog("On sort de GetText()");
#endif
return Constants.FILTER_S_LAST_TEXT;
}
/// <summary>Retrieves a value (internal value-type property) from a chunk, which must have a CHUNKSTATE enumeration value of CHUNK_VALUE.</summary>
/// <param name="ppPropValue"></param>
/// <remarks>According to the blog, the most important ones are:
/// DocAuthor, PrimaryDate, PercievedType and DocTitle.
/// PerceivedTypes include contact, communications/calendar
/// document/note and communications/task</remarks>
///
[PreserveSig]
public int GetValue(UIntPtr ppPropValue)
{
#if DEBUG
_writeLog("On entre (et sort) de GetValue()");
#endif
return Constants.FILTER_E_NO_VALUES;
}
/// <summary>Returns the class identifier (CLSID) for the component object. In the case
/// of a filter, this is the file type identifier.</summary>
/// <param name="pClassID"></param>
public void GetClassID(out Guid pClassID)
{
#if DEBUG
_writeLog("On entre (et sort) de GetClassID()");
#endif
pClassID = new Guid(myGuid);
}
public void BindRegion([MarshalAs(UnmanagedType.Struct)]FILTERREGION origPos, ref Guid riid, ref UIntPtr ppunk)
{
#if DEBUG
_writeLog("On entre (et sort) de BindRegion()");
#endif
return;
}
/// <summary>Open and initialize the file</summary>
/// <param name="pszFileName">Absolute file path to open/initialize</param>
/// <param name="dwMode">STGM flags for how to open</param>
/// <remarks>The STGM Flags provide 18 options and additional combinations for how to open
/// and process the file. Since IFilters are inherently read-only to the IPersist:: file,
/// most of these are irrelevant. So we're ignoring it.</remarks>
public void Load(string pszFileName, int dwMode)
{
#if DEBUG
_writeLog("On entre dans Load()");
_writeLog(string.Format("On indexe {0}", pszFileName));
#endif
currentFileName = pszFileName;
#if DEBUG
_writeLog("On sort de Load()");
#endif
}
#if DEBUG
static public void _writeLog(string text)
{
string logFileName = "c:\\in\\logfile.txt";
StreamWriter mylog = new StreamWriter(logFileName, true);
if (mylog != null)
mylog.WriteLine(DateTime.Now.ToLongTimeString() + " " + text);
mylog.Close();
}
#endif
// These are stubs needed for the interface but never called for Read-Only Access
public void GetCurFile(out string ppszFileName) { ppszFileName = currentFileName; }
public int IsDirty() { return Constants.E_NOTIMPL; }
public void Save(string pszFileName, bool fRemember) { }
public void SaveCompleted(string pszFileName) { }
}
[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
}
/// <summary>Describes what separates the CURRENT chunk from the PREVIOUS chunk with the same Attribute.
/// Used by IFilter::GetChunk() in the return.</summary>
public enum CHUNK_BREAKTYPE
{
CHUNK_NO_BREAK = 0, /// <summary>No Break from previous and doesn't get flags/attributes; glue them </summary>
CHUNK_EOW = 1, /// <summary>Reached the End-Of-Word. Don't use it; language dependent.</summary>
CHUNK_EOS = 2, /// <summary>Sentence Break</summary>
CHUNK_EOP = 3, /// <summary>Paragraph Break</summary>
CHUNK_EOC = 4 /// <summary>Chapter Break</summary>
}
[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)]
[StructLayout(LayoutKind.Explicit)]
public struct PROPSPEC
{
[FieldOffset(0)]
public uint ulKind;
[FieldOffset(4)]
public uint propid;
// NOTE: The real structure uses a Union. C# doesn't support unions. So I've commented
// out this element to make the correct size. Other samples don't do this. TMcN
[FieldOffset(4)]
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;
}
[StructLayout(LayoutKind.Sequential)]
public struct PROPVARIANT
{
public short vt; /// <summary>Variant Type</summary>
public short reserved1;
public short reserved2;
public short reserved3;
unsafe
public char* pwszVal;
}
[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 int pcwcBuffer, IntPtr buffer);
[PreserveSig]
int GetValue(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));
public const int S_OK = (unchecked((int)0x00000000L));
public const int S_FALSE = (unchecked((int)0x00000001L));
public const int E_NOTIMPL = (unchecked((int)0x80004001L));
public const int E_ABORT = (unchecked((int)0x80004004L));
}
public class TesseractOCR
{
private string commandpath;
private string outpath;
public TesseractOCR(string commandpath)
{
#if DEBUG
_writeLog("TesseractOCR()");
#endif
this.commandpath = commandpath;
outpath = Path.ChangeExtension(Path.GetTempFileName(), ".txt");
#if DEBUG
_writeLog(string.Format("commandpath : {0}", commandpath));
_writeLog(string.Format("outpath : {0}", outpath));
#endif
}
private string analyze(string filename)
{
#if DEBUG
_writeLog("analyze()");
#endif
string args = string.Format("\"{0}\" \"{1}\" -l fra", filename, outpath.Replace(".txt", string.Empty));
#if DEBUG
_writeLog(string.Format("args : {0}", args));
#endif
ProcessStartInfo startinfo = new ProcessStartInfo(commandpath, args);
startinfo.CreateNoWindow = true;
startinfo.UseShellExecute = false;
#if DEBUG
_writeLog(string.Format("commandpath : {0}", commandpath));
if (!File.Exists(filename))
{
_writeLog(string.Format("Le fichier {0} n'existe pas !", filename));
}
_writeLog("Lancement de la reconnaissance OCR");
#endif
Process.Start(startinfo).WaitForExit();
string ret = "";
#if DEBUG
if (!File.Exists(outpath))
{
_writeLog(string.Format("Le fichier {0} n'existe pas !", outpath));
}
#endif
using (StreamReader r = new StreamReader(outpath))
{
#if DEBUG
_writeLog("lecture du fichier de sortie");
#endif
string content = r.ReadToEnd();
ret = content;
}
#if DEBUG
_writeLog(string.Format("ret : {0}", ret));
#endif
File.Delete(outpath);
return ret;
}
public string OCRFromFile(string filename)
{
#if DEBUG
_writeLog("OCRFromFile()");
#endif
return analyze(filename);
}
#if DEBUG
static public void _writeLog(string text)
{
string logFileName = "c:\\in\\logfile2.txt";
StreamWriter mylog = new StreamWriter(logFileName, true);
if (mylog != null)
mylog.WriteLine(DateTime.Now.ToLongTimeString() + " " + text);
mylog.Close();
}
#endif
}
} |
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