typedef __nogc struct HDRBLKtag{

       long 		Var_length_block_size;
       long 		Sample_Size_ECG;	
       long		    Offset_var_lenght_block;
       long		    Offset_ECG_block;
       short int 	File_Version;
       unsigned char First_Name[40];  									        								
       unsigned	char	Last_Name[40];  									        								
       unsigned	char	ID[20];  									        								
       short int 	Sex;
       short int 	Race;
       short int   	Birth_Date[3];	
       short int   	Record_Date[3];	
       short int   	File_Date[3];	
       short int  	Start_Time[3];	
       short int	nLeads;
       short int   	Lead_Spec[12];	
       short int   	Lead_Qual[12];	
       short int   	Resolution[12];	
       short int   	Pacemaker;	
       unsigned char	Recorder[40];
       short int	Sampling_Rate;	
       unsigned char			Proprietary[80];
       unsigned char			Copyright[80];
       unsigned char		Reserved[88];
} ISNEHeader; 


		// This function read the Ishne ECG files
		void readIshneECG(String * strFileName)
		{
			int			i, j; 
			FileStream	*fsIn; 
			BinaryReader *br;
			System::Windows::Forms::DialogResult result;
		
			unsigned char		magicnumber __gc[];
			unsigned short		checksum;

			try
			{
				fsIn = File::OpenRead(strFileName);
				br = new BinaryReader(fsIn);

				// get magic number
				magicnumber = br->ReadBytes(8);

				// get checksum
				checksum = br->ReadInt16();

				///////////// read header /////////////////////
							
				// get Var_length_block_size
				m_ISHNEHeader.Var_length_block_size = br->ReadInt32();

				// get Sample_Size_ECG
				m_ISHNEHeader.Sample_Size_ECG = br->ReadInt32();
				
				// get Offset_var_length_block
				m_ISHNEHeader.Offset_var_lenght_block = br->ReadInt32();
				

				// get Offset_ECG_block
				m_ISHNEHeader.Offset_ECG_block = br->ReadInt32();

				// get File_Version
				m_ISHNEHeader.File_Version = br->ReadInt16();

				// get First_Name
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.First_Name[i] = (char)br->ReadByte();
			
				// get Last_Name
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.Last_Name[i] = (char)br->ReadByte();
			
				// get ID
				for (i = 0; i < 20; i++)
					m_ISHNEHeader.ID[i] = (char)br->ReadByte();
				
				// get Sex
				m_ISHNEHeader.Sex = br->ReadInt16();
				
				// get Race
				m_ISHNEHeader.Race = br->ReadInt16();
				
				// get Birth_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Birth_Date[i] = br->ReadInt16();
				
				// get Record_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Record_Date[i] = br->ReadInt16();

				// get File_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.File_Date[i] = br->ReadInt16();

				// get Start_Time
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Start_Time[i] = br->ReadInt16();

				// get nLeads;
				m_ISHNEHeader.nLeads = br->ReadInt16();
				
				// get Lead_Spec
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Lead_Spec[i] = br->ReadInt16();
				

				// get Lead_Qual
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Lead_Qual[i] = br->ReadInt16();


				// get Resolution
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Resolution[i] = br->ReadInt16();
			
				// get Pacemaker
				m_ISHNEHeader.Pacemaker = br->ReadInt16();

				// get Recorder
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.Recorder[i] = (char)br->ReadByte();

				// get Sampling_Rate
				m_ISHNEHeader.Sampling_Rate = br->ReadInt16();
				
				// get Propriety
				for (i = 0; i < 80; i++)
					m_ISHNEHeader.Proprietary[i] = (char)br->ReadByte();
	
				// get Copyright
				for (i = 0; i < 80; i++)
					m_ISHNEHeader.Copyright[i] = (char)br->ReadByte();

				// get Reserved
				for (i = 0; i < 88; i++)
					m_ISHNEHeader.Reserved[i] = (char)br->ReadByte();

				if (m_ISHNEHeader.Var_length_block_size > 0)
				{
					varblock = new char __gc[m_ISHNEHeader.Var_length_block_size];
					varblock = br->ReadBytes(m_ISHNEHeader.Var_length_block_size);
				}
	
			
				// read ECG data
				short	data;
				
				for (i = 0; i < m_ISHNEHeader.Sample_Size_ECG; i++)
				{
					for (j = 0; j < m_ISHNEHeader.nLeads; j++)
					{
						data = br->ReadInt16();
					}
				}
			
				br->Close();
				fsIn->Close();
				
			}
			catch (Exception *ex)
			{
				result = MessageBox::Show (String::Concat("Exception in reading Ishne ECG file: ", ex->Message), "Read ECG", MessageBoxButtons::OK, MessageBoxIcon::Asterisk);
			}
		}

		// The function reads the binary formatted Ishen annotation file
		void readIshneAnnotation(String * strFileName)
		{
			int			i, j, loc; 
			unsigned char	ann, internalUse;
			unsigned short	RR;
			FileStream	*fsIn; 
			BinaryReader *br;
			System::Windows::Forms::DialogResult result;
		
			unsigned char		magicnumber __gc[];
			unsigned short		checksum;

			try
			{
				fsIn = File::OpenRead(strFileName);
				br = new BinaryReader(fsIn);

				// get magic number
				magicnumber = br->ReadBytes(8);

				// get checksum
				checksum = br->ReadInt16();

				///////////// read header /////////////////////
							
				// get Var_length_block_size
				m_ISHNEHeader.Var_length_block_size = br->ReadInt32();

				// get Sample_Size_ECG
				m_ISHNEHeader.Sample_Size_ECG = br->ReadInt32();
				
				// get Offset_var_length_block
				m_ISHNEHeader.Offset_var_lenght_block = br->ReadInt32();
				

				// get Offset_ECG_block
				m_ISHNEHeader.Offset_ECG_block = br->ReadInt32();

				// get File_Version
				m_ISHNEHeader.File_Version = br->ReadInt16();

				// get First_Name
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.First_Name[i] = (char)br->ReadByte();
			
				// get Last_Name
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.Last_Name[i] = (char)br->ReadByte();
			
				// get ID
				for (i = 0; i < 20; i++)
					m_ISHNEHeader.ID[i] = (char)br->ReadByte();
				
				// get Sex
				m_ISHNEHeader.Sex = br->ReadInt16();
				
				// get Race
				m_ISHNEHeader.Race = br->ReadInt16();
				
				// get Birth_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Birth_Date[i] = br->ReadInt16();
				
				// get Record_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Record_Date[i] = br->ReadInt16();

				// get File_Date
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.File_Date[i] = br->ReadInt16();

				// get Start_Time
				for (i = 0; i < 3; i++)
					m_ISHNEHeader.Start_Time[i] = br->ReadInt16();

				// get nLeads;
				m_ISHNEHeader.nLeads = br->ReadInt16();
				
				// get Lead_Spec
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Lead_Spec[i] = br->ReadInt16();
				

				// get Lead_Qual
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Lead_Qual[i] = br->ReadInt16();


				// get Resolution
				for (i = 0; i < 12; i++)
					m_ISHNEHeader.Resolution[i] = br->ReadInt16();
			
				// get Pacemaker
				m_ISHNEHeader.Pacemaker = br->ReadInt16();

				// get Recorder
				for (i = 0; i < 40; i++)
					m_ISHNEHeader.Recorder[i] = (char)br->ReadByte();

				// get Sampling_Rate
				m_ISHNEHeader.Sampling_Rate = br->ReadInt16();
				
				// get Propriety
				for (i = 0; i < 80; i++)
					m_ISHNEHeader.Proprietary[i] = (char)br->ReadByte();
	
				// get Copyright
				for (i = 0; i < 80; i++)
					m_ISHNEHeader.Copyright[i] = (char)br->ReadByte();

				// get Reserved
				for (i = 0; i < 88; i++)
					m_ISHNEHeader.Reserved[i] = (char)br->ReadByte();

				if (m_ISHNEHeader.Var_length_block_size > 0)
				{
					varblock = new char __gc[m_ISHNEHeader.Var_length_block_size];
					varblock = br->ReadBytes(m_ISHNEHeader.Var_length_block_size);
				}
	
			
				// read annotation

				// read first location
				loc = br->ReadInt32();

				while (br->PeekChar() != -1)
				{
					// read ann and internalUse
					ann = br->ReadByte();
					internalUse = br->ReadByte();

					// read RR
					RR = br->ReadUInt16();
					loc += RR;

				}
			
				br->Close();
				fsIn->Close();
				
			}
			catch (Exception *ex)
			{
				result = MessageBox::Show (String::Concat("Exception in reading Ishne annotation file: ", ex->Message), "Read Annotation", MessageBoxButtons::OK, MessageBoxIcon::Asterisk);
			}
		}