rlHistoryReader Class Reference

#include <rlhistoryreader.h>

Collaboration diagram for rlHistoryReader:

Public Member Functions
	rlHistoryReader ()
virtual	~rlHistoryReader ()
int	read (const char *csvName, rlTime *start, rlTime *end)
const char *	firstLine ()
const char *	nextLine ()
int	clean ()
int	cat (const char *csvName, FILE *fout)

Public Attributes
int	debug

Private Member Functions
int	openFile ()
int	pushLineToMemory (const char *line)

Private Attributes
rlHistoryReaderLine *	first_line
rlHistoryReaderLine *	current_line
rlTime	time
FILE *	fin
int	current_file
char *	csv_name
char *	csv_file_name

Detailed Description

This class reads tab separated text including time stamp from 10 csv files
Use it together with rlHistoryLogger.

Example usage within pvbrowser slot function:

#include "rlhistoryreader.h"

typedef struct // (todo: define your data structure here)
{
  rlHistoryReader hist;
}
DATA;

...snip...

static int slotButtonEvent(PARAM *p, int id, DATA *d)
{
  if(p == NULL || id == 0 || d == NULL) return -1;
  if(id == buttonShowPlot)
  {
    rlTime tStart, tDiff, tEnd;
    tStart.year  = 2009;
    tStart.month = 8;
    tStart.day   = 29;
    tStart.hour  = 0;

    tDiff.hour = 24;

    tEnd = tStart + tDiff;

    printf("start=%s diff=%s end=%s\n",tStart.getTimeString(), tDiff.getTimeString(), tEnd.getTimeString());

    if(d->hist.read("test", &tStart, &tEnd) < 0)
    {
      printf("could not read test csv file\n");
      return 0;
    }
    const char *line = d->hist.firstLine();
    while(*line != '\0')
    {
      printf("line=%s", line);
      const char *values = strchr(line,'');
      if(values != NULL)
      {
        float val1, val2;
        sscanf(values,"\t%f\t%f", &val1, &val2);
        printf("val1=%f val2=%f\n", val1, val2);
        //// fill your buffer for plotting here
      }
      line = d->hist.nextLine();
    }
    //// display your xy-graphic from the filled buffer here
  }
  return 0;
}

Definition at line 86 of file rlhistoryreader.h.

Constructor & Destructor Documentation

rlHistoryReader()

rlHistoryReader::rlHistoryReader

(

)

Definition at line 22 of file rlhistoryreader.cpp.

{
  debug = 0;
  first_line = current_line = NULL;
  fin = NULL;
  current_file = -1;
  csv_name = NULL;
  csv_file_name = NULL;
}

~rlHistoryReader()

rlHistoryReader::~rlHistoryReader ( )

virtual

Definition at line 32 of file rlhistoryreader.cpp.

{
  clean();
  if(csv_name != NULL) delete [] csv_name;
  csv_name = NULL;
  if(csv_file_name != NULL) delete [] csv_file_name;
  csv_file_name = NULL;
}

Member Function Documentation

cat()

int rlHistoryReader::cat	(	const char *	csvName,
		FILE *	fout
	)

Definition at line 187 of file rlhistoryreader.cpp.

{
  char *buf;
  clean();
  if(csv_name != NULL) delete [] csv_name;
  csv_name = NULL;
  if(csv_file_name != NULL) delete [] csv_file_name;
  csv_file_name = NULL;

  first_line = current_line = NULL;
  fin = NULL;
  current_file = -1;
  csv_name = new char[strlen(csvName)+1];
  strcpy(csv_name,csvName);
  csv_file_name = new char[strlen(csvName)+132];

  buf = new char[MAXBUF];
  for(int i=0; i<10; i++)
  {
    openFile();
    if(fin == NULL) break;
    while(fgets(buf,MAXBUF-1,fin) != NULL)
    {
      fprintf(fout,"%s",buf);
    }
    fclose(fin);
    fin = NULL;
  }
  delete [] buf;
  return 0;
}

clean()

int rlHistoryReader::clean

(

)

Definition at line 88 of file rlhistoryreader.cpp.

{
  if(fin != NULL) fclose(fin);
  fin = NULL;
  if(first_line != NULL)
  {
    rlHistoryReaderLine *last_line;
    current_line = first_line;
    while(current_line != NULL)
    {
      last_line = current_line;
      current_line = current_line->next;
      if(last_line != NULL)
      {
        delete [] last_line->line;
        delete last_line;
      }
    }
  }
  return 0;
}

firstLine()

const char * rlHistoryReader::firstLine

(

)

Definition at line 172 of file rlhistoryreader.cpp.

{
  if(first_line == NULL) return "";
  current_line = first_line;
  return current_line->line;
}

nextLine()

const char * rlHistoryReader::nextLine

(

)

Definition at line 179 of file rlhistoryreader.cpp.

{
  if(current_line == NULL) return "";
  current_line = current_line->next;
  if(current_line == NULL) return "";
  return current_line->line;
}

openFile()

int rlHistoryReader::openFile ( )

private

Definition at line 110 of file rlhistoryreader.cpp.

{
  if(current_file == -1)
  {
    // find oldest file and open it for reading
    int i_oldest = 0;
    rlTime t,t_oldest;
    t_oldest.getLocalTime(); // this must be newer that any file time
    for(int i=0; i<10; i++)
    {
      sprintf(csv_file_name,"%s%d.csv",csv_name,i);
      if(t.getFileModificationTime(csv_file_name) == 0)
      {
        if(debug) printf("try openFile=%s\n",csv_file_name);
        if(t < t_oldest)
        {
          i_oldest = i;
          t_oldest = t;
        }
      }
    }
    current_file = i_oldest;
    sprintf(csv_file_name,"%s%d.csv",csv_name,i_oldest);
    if(debug) printf("oldestFile=%s\n",csv_file_name);
    fin = fopen(csv_file_name,"r");
    if(debug && fin != NULL) printf("success openFile=%s\n",csv_file_name);
  }
  else
  {
    // open next file for reading
    current_file++;
    if(current_file >= 10) current_file = 0;
    sprintf(csv_file_name,"%s%d.csv",csv_name,current_file);
    fin = fopen(csv_file_name,"r");
    if(debug && fin != NULL) printf("success openFile=%s\n",csv_file_name);
  }
  return 0;
}

pushLineToMemory()

int rlHistoryReader::pushLineToMemory ( const char *  line )

private

Definition at line 149 of file rlhistoryreader.cpp.

{
  rlHistoryReaderLine *history_line;

  // put line at 1 position
  if(first_line == NULL)
  {
    first_line = new rlHistoryReaderLine;
    first_line->line = new char[strlen(line)+1];
    strcpy(first_line->line,line);
    first_line->next = NULL;
  }
  else
  {
    history_line = first_line;
    first_line = new rlHistoryReaderLine;
    first_line->line = new char[strlen(line)+1];
    strcpy(first_line->line,line);
    first_line->next = history_line;
  }
  return 0;
}

read()

int rlHistoryReader::read	(	const char *	csvName,
		rlTime *	start,
		rlTime *	end
	)

Definition at line 41 of file rlhistoryreader.cpp.

{
  char *buf;
  clean();
  if(csv_name != NULL) delete [] csv_name;
  csv_name = NULL;
  if(csv_file_name != NULL) delete [] csv_file_name;
  csv_file_name = NULL;

  first_line = current_line = NULL;
  fin = NULL;
  current_file = -1;
  csv_name = new char[strlen(csvName)+1];
  strcpy(csv_name,csvName);
  csv_file_name = new char[strlen(csvName)+132];

  buf = new char[MAXBUF];
  for(int i=0; i<10; i++)
  {
    openFile();
    if(debug) printf("reading=%s\n",csv_file_name);
    if(fin == NULL) break;
    while(fgets(buf,MAXBUF-1,fin) != NULL)
    {
      time.setTimeFromString(buf);
      if(time < *start)
      {
        if(debug) printf("too old=%s",buf);
      }
      else if(time > *end)
      {
        if(debug) printf("too new=%s",buf);
        break;
      }
      else
      {
        if(debug) printf("pushLineToMemory=%s",buf);
        pushLineToMemory(buf);
      }
    }
    fclose(fin);
    fin = NULL;
  }
  delete [] buf;
  return 0;
}

Member Data Documentation

csv_file_name

char * rlHistoryReader::csv_file_name

private

Definition at line 104 of file rlhistoryreader.h.

csv_name

char* rlHistoryReader::csv_name

private

Definition at line 104 of file rlhistoryreader.h.

current_file

int rlHistoryReader::current_file

private

Definition at line 103 of file rlhistoryreader.h.

current_line

rlHistoryReaderLine * rlHistoryReader::current_line

private

Definition at line 100 of file rlhistoryreader.h.

debug

int rlHistoryReader::debug

Definition at line 96 of file rlhistoryreader.h.

fin

FILE* rlHistoryReader::fin

private

Definition at line 102 of file rlhistoryreader.h.

first_line

rlHistoryReaderLine* rlHistoryReader::first_line

private

Definition at line 100 of file rlhistoryreader.h.

time

rlTime rlHistoryReader::time

private

Definition at line 101 of file rlhistoryreader.h.

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The documentation for this class was generated from the following files:

• rlhistoryreader.h
• rlhistoryreader.cpp