C # writes a DLL that reads ISO2709 format data

Data

Using System;
Using System.Collections;

/*
The function of this class is to read ISO2709 data
Get ISO2709 data three segments, header \ Catalog \ Data
Get field information
Get child field information
*/

Namespace Nosi.library
{
<summary>
Summary description of the CLASS1.
</summary>
public class Marc
{
#region Constant Definition

Public const char fldend = (char) 30; Field End character
Public const char recend = (char) 29; Record End character
Public const char SUBFLD = (char) 31; Child Field Indicator

public const int Fldname_len = 3; Field name length
public const int Max_marcrec_len = 100000; Max length of Marc Record

#endregion

String m_strmarc = ""; Marc Recording Body

Public Marc ()
{
//
TODO: Add constructor logic here
//
}
Mark
private String GetHeader ()
{
string strheader = null;
Strheader = m_strmarc.substring (0,24);
return strheader;
}
Get the Catalog
private String Getmuci ()
{

char[] Charr = M_strmarc.tochararray ();
string strmuci = null;
int i = 24; Header character no longer read
while (I < m_strmarc.length)
{
Strmuci + = Charr[i]. ToString ();
if (charr[i] = = fldend) break; Discovery Field Identification
i++;
}

return STRMUCI;

}

Get Data area
private String GetData ()
{
string strdata = null;
int Imuci = this. Getmuci (). Length;
int Iheader = this. GetHeader (). Length;
int imarc = M_strmarc.length;
Strdata = m_strmarc.substring (Imuci + iheader,imarc-imuci-iheader);
return strdata;
}

Get the field names in the catalog area
-1 Error
0 no found
1 found
private int Getfieldpos (string strfieldname,
int nindex,
Out string Strfieldpos)
{
String Strmuci = this. Getmuci ();
Strfieldpos = null;

int i = 0;
int nret = 0;

if (Strmuci = null)
return-1;

if ((strmuci.length-1)% 12!= 0)//minus 1 is due to the catalog end identifier
return-1; Length Error

Todo
{
if (strmuci.substring (i,3) = = strFieldName)
Nret + +;
if (nret = = nindex)/from zero add
{
Strfieldpos = strmuci.substring (i,12);
Break
}
i + 12;
while (i<strmuci.length);

if (Strfieldpos = null)

return 0; No found


return 1;
}

Get field contents by field name, number of occurrences in a field
Count starting from 1
-1 Error
0 no found
1 found
public int GetField (String strfldname,
int nindex,
Out string strfld)
{
STRFLD = null;

string strfldpos = null;
int nret = this. Getfieldpos (Strfldname,nindex,out strfldpos);
if (nret!= 1)
return nret;
if (strfldname.length!= 3)
return-1; Subfield must 3 chars

int nlength = Int. Parse (strfldpos.substring (3,4));
int nbeginpos = Int. Parse (strfldpos.substring (7,5));
Char[] Chdata = this. GetData (). ToCharArray ();
int NPOs = 0;
int i = 0;
while (NPOs < chdata.length)
{
i + + getcharlength (Chdata[npos]);
if ((i >= nbeginpos) && i<= (Nbeginpos + nlength))
STRFLD + = Chdata[npos]. ToString ();
NPOs + +;

}
if (STRFLD = null)
return 0;
return 1;
}
Get occurrences of a child field from a field
-1 Error
0 not found
1 found
public int Getsubfield (String strfld,
String Strsubname,
int nindex,
Out string strsubfld)
{
STRSUBFLD = null;
if (strsubname.length!= 1)
return-1; Subfield ' symbol char must 1 char
if (STRFLD = null)
return-1;

char[] Chdata = Strfld.tochararray ();
int NPOs = 0;
BOOL Isnewsub = false;
int nfound = 0; 0:not 1:first time found 2:second time found
while (NPOs < chdata.length)
{
NPOs + +;

if ((chdata[npos-1] = = subfld) && (Chdata[npos]. ToString () = = Strsubname))
Nfound + +; Found

if ((Nfound = = nindex) && (isnewsub = = False))
{
if (chdata[npos] = = SUBFLD)
{
Isnewsub = true;
Break
}
STRSUBFLD + = Chdata[npos]. ToString ();
}

}
if (STRSUBFLD = null)
return 0;
return 1;
}

Get a child field from a field group
-1 Error
0 not found
1 found
public int Getsubfield (String strgroup,
String Strsubname,
Out string strsubfld)
{
STRSUBFLD = null;
if (strsubname.length!= 1)
return-1; Subfield ' symbol char must 1 char
if (Strgroup = null)
return-1;

char[] Chdata = Strgroup.tochararray ();
int NPOs = 0;
BOOL Isnewsub = false;
int nfound = 0; 0:not 1:first time found 2:second time found
while (NPOs < chdata.length)
{
NPOs + +;

if ((chdata[npos-1] = = subfld) && (Chdata[npos]. ToString () = = Strsubname))
Nfound + +; Found

if (isnewsub = = False)
{
if (chdata[npos] = = SUBFLD)
{
Isnewsub = true;
Break
}
STRSUBFLD + = Chdata[npos]. ToString ();
}

}
if (STRSUBFLD = null)
return 0;
return 1;
}

 //Get occurrences of the secondary number segment group in the field
 //-1 Error
 //0 not found
 //1 found
&nb Sp public int Getfieldgroup (string strfld,
   int nindex,
   out string strgroup)
  {
   strgroup = null;
  
   if (strfld = null)
    return-1
  
   char[] chdata = Strfld.tochararray ();
   int NPOs = 0;
   String strsplit = "a";//generally distinguished by a child field as a field group
   int nfound = 0;//0:not 1:first time found 2: Second time found
   while (NPOs < chdata.length)
   {   
     NPOs + +;
 
    if ((chdata[npos-1] = = subfld) && (Chdata[npos). ToString () = = Strsplit)
     nfound + +;//found   

    if (Nfound = nindex)
     Strgroup + = Chdata[npos] . ToString ();
    if (Nfound > Nindex)
     break;   
  
   if (strgroup = null)
    return 0;
   return 1;
 }
 //Get character length
 //
  private int getcharlength (char ch)
  {
   int nlength = 0;
  
   if (short) ch < 0 | | (short) ch  > 128)
   {
    nlength + + 2;
  }
   Else
   {
    nlength = nlength + 1;
  }
   return nlength;
 }

public string Strmarc
{
Get
{
return M_STRMARC;
}
Set
{
M_strmarc = value;
}

}
}
}