Code for read a file

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  • Hollywood
    #1

    Code for read a file

    Hello members of the comp.lang.c++,

    My log file is made of a set of 1000 following lines kind:

    21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
    21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
    .....

    commas ',' are used as field separators (data, name, value).

    I'd need a program that read any field into the following structured
    table (without the commas)

    struct
    {
    char strDateHour[30];
    char strName[80];
    double value;
    } Data[1000];

    Please can you explain a simple code to do so ?

    Thank-You

    Octavio

    Tags: None
    • Hollywood
      #2
      Re: Code for read a file

      On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
      Hello members of the comp.lang.c++,
      >
      My log file is made of a set of 1000 following lines kind:
      >
      21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
      21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
      ....
      >
      commas ',' are used as field separators (data, name, value).
      >
      I'd need a program that read any field into the following structured
      table (without the commas)
      >
      struct
      {
      char strDateHour[30];
      char strName[80];
      double value;
      } Data[1000];
      >
      Please can you explain a simple code to do so ?
      >
      Thank-You
      >
      Octavio
      I just forgot to tell you the file object is a CFile class one.

        Comment

        • Sze
          #3
          Re: Code for read a file

          On 25 Sep., 16:15, Hollywood <freepos...@gma il.comwrote:
          On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
          >
          >
          >
          Hello members of the comp.lang.c++,
          >
          My log file is made of a set of 1000 following lines kind:
          >
          21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
          21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
          ....
          >
          commas ',' are used as field separators (data, name, value).
          >
          I'd need a program that read any field into the following structured
          table (without the commas)
          >
          struct
          {
          char strDateHour[30];
          char strName[80];
          double value;
          } Data[1000];
          >
          Please can you explain a simple code to do so ?
          >
          Thank-You
          >
          Octavio
          >
          I just forgot to tell you the file object is a CFile class one.
          Perhaps you should, paste your code or a link to it, because else it
          looks like
          you are searching for a programming slave, instead of someone who is
          in a beneficial mood,
          so he want to use his time to help you.
          Nobody likes it to help somebody with something, who doesn`t seem like
          he is trying it by himself.

            Comment

            • =?UTF-8?B?RXJpayBXaWtzdHLDtm0=?=
              #4
              Re: Code for read a file

              On 2007-09-25 16:05, Hollywood wrote:
              Hello members of the comp.lang.c++,
              >
              My log file is made of a set of 1000 following lines kind:
              >
              21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
              21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
              ....
              >
              commas ',' are used as field separators (data, name, value).
              >
              I'd need a program that read any field into the following structured
              table (without the commas)
              >
              struct
              {
              char strDateHour[30];
              char strName[80];
              double value;
              } Data[1000];
              >
              Please can you explain a simple code to do so ?
              Look into overloading the >operator for you struct, perhaps by using
              getline() to read a line and then parsing each line for the values.

              --
              Erik Wikström

                Comment

                • Hollywood
                  #5
                  Re: Code for read a file

                  On 25 sep, 17:09, Sze <kamistr...@gmx .dewrote:
                  On 25 Sep., 16:15, Hollywood <freepos...@gma il.comwrote:
                  >
                  >
                  >
                  >
                  >
                  On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
                  >
                  Hello members of the comp.lang.c++,
                  >
                  My log file is made of a set of 1000 following lines kind:
                  >
                  21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
                  21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
                  ....
                  >
                  commas ',' are used as field separators (data, name, value).
                  >
                  I'd need a program that read any field into the following structured
                  table (without the commas)
                  >
                  struct
                  {
                  char strDateHour[30];
                  char strName[80];
                  double value;
                  } Data[1000];
                  >
                  Please can you explain a simple code to do so ?
                  >
                  Thank-You
                  >
                  Octavio
                  >
                  I just forgot to tell you the file object is a CFile class one.
                  >
                  Perhaps you should, paste your code or a link to it, because else it
                  looks like
                  you are searching for a programming slave, instead of someone who is
                  in a beneficial mood,
                  so he want to use his time to help you.
                  Nobody likes it to help somebody with something, who doesn`t seem like
                  he is trying it by himself.- Masquer le texte des messages précédents-
                  >
                  - Afficher le texte des messages précédents -
                  Ok, thank-You for your remarks.
                  Here goes what I've got :

                  #include "StdAfx.h"
                  #include "listelem.h "

                  CListElem ObjFile;

                  CListElem::CLis tElem(void)
                  {
                  }

                  CListElem::~CLi stElem(void)
                  {
                  }
                  void CListElem::Read LogFile()
                  {
                  // Open the LogFile

                  CFile LogFile;
                  CFileException e;
                  char* pLogFileName = "Log.log";
                  if( !LogFile.Open( pLogFileName, CFile::modeRead , &e ) )
                  {
                  #ifdef _DEBUG
                  afxDump << "The file is not open " << e.m_cause << "\n";
                  #endif
                  }

                  // Reading part

                  // while not end of file
                  // read every character of the Log file and put it
                  into the structure above


                  }

                  struct
                  {
                  char strDateHour[30];
                  char strName[80];
                  double value;
                  } Data[1000];

                  Now the question is how to test the end of a CFile file ? ( a kind of
                  EndOfFile).

                  Many Thanks

                  Octavio

                    Comment

                    • Sze
                      #6
                      Re: Code for read a file

                      On 25 Sep., 18:15, Hollywood <freepos...@gma il.comwrote:
                      On 25 sep, 17:09, Sze <kamistr...@gmx .dewrote:
                      >
                      >
                      >
                      On 25 Sep., 16:15, Hollywood <freepos...@gma il.comwrote:
                      >
                      On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
                      >
                      Hello members of the comp.lang.c++,
                      >
                      My log file is made of a set of 1000 following lines kind:
                      >
                      21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
                      21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
                      ....
                      >
                      commas ',' are used as field separators (data, name, value).
                      >
                      I'd need a program that read any field into the following structured
                      table (without the commas)
                      >
                      struct
                      {
                      char strDateHour[30];
                      char strName[80];
                      double value;
                      } Data[1000];
                      >
                      Please can you explain a simple code to do so ?
                      >
                      Thank-You
                      >
                      Octavio
                      >
                      I just forgot to tell you the file object is a CFile class one.
                      >
                      Perhaps you should, paste your code or a link to it, because else it
                      looks like
                      you are searching for a programming slave, instead of someone who is
                      in a beneficial mood,
                      so he want to use his time to help you.
                      Nobody likes it to help somebody with something, who doesn`t seem like
                      he is trying it by himself.- Masquer le texte des messages précédents -
                      >
                      - Afficher le texte des messages précédents -
                      >
                      Ok, thank-You for your remarks.
                      Here goes what I've got :
                      >
                      #include "StdAfx.h"
                      #include "listelem.h "
                      >
                      CListElem ObjFile;
                      >
                      CListElem::CLis tElem(void)
                      {
                      >
                      }
                      >
                      CListElem::~CLi stElem(void)
                      {}
                      >
                      void CListElem::Read LogFile()
                      {
                      // Open the LogFile
                      >
                      CFile LogFile;
                      CFileException e;
                      char* pLogFileName = "Log.log";
                      if( !LogFile.Open( pLogFileName, CFile::modeRead , &e ) )
                      {
                      #ifdef _DEBUG
                      afxDump << "The file is not open " << e.m_cause << "\n";
                      #endif
                      }
                      >
                      // Reading part
                      >
                      // while not end of file
                      // read every character of the Log file and put it
                      into the structure above
                      >
                      }
                      >
                      struct
                      {
                      char strDateHour[30];
                      char strName[80];
                      double value;
                      } Data[1000];
                      >
                      Now the question is how to test the end of a CFile file ? ( a kind of
                      EndOfFile).
                      >
                      Many Thanks
                      >
                      Octavio
                      I am not sure where this CFile class belongs to, could you please
                      enlighten me, so I could help you, hopefully?

                        Comment

                        • Sze
                          #7
                          Re: Code for read a file

                          On 25 Sep., 19:43, Sze <kamistr...@gmx .dewrote:
                          On 25 Sep., 18:15, Hollywood <freepos...@gma il.comwrote:
                          >
                          >
                          >
                          On 25 sep, 17:09, Sze <kamistr...@gmx .dewrote:
                          >
                          On 25 Sep., 16:15, Hollywood <freepos...@gma il.comwrote:
                          >
                          On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
                          >
                          Hello members of the comp.lang.c++,
                          >
                          My log file is made of a set of 1000 following lines kind:
                          >
                          21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
                          21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
                          ....
                          >
                          commas ',' are used as field separators (data, name, value).
                          >
                          I'd need a program that read any field into the following structured
                          table (without the commas)
                          >
                          struct
                          {
                          char strDateHour[30];
                          char strName[80];
                          double value;
                          } Data[1000];
                          >
                          Please can you explain a simple code to do so ?
                          >
                          Thank-You
                          >
                          Octavio
                          >
                          I just forgot to tell you the file object is a CFile class one.
                          >
                          Perhaps you should, paste your code or a link to it, because else it
                          looks like
                          you are searching for a programming slave, instead of someone who is
                          in a beneficial mood,
                          so he want to use his time to help you.
                          Nobody likes it to help somebody with something, who doesn`t seem like
                          he is trying it by himself.- Masquer le texte des messages précédents -
                          >
                          - Afficher le texte des messages précédents -
                          >
                          Ok, thank-You for your remarks.
                          Here goes what I've got :
                          >
                          #include "StdAfx.h"
                          #include "listelem.h "
                          >
                          CListElem ObjFile;
                          >
                          CListElem::CLis tElem(void)
                          {
                          >
                          }
                          >
                          CListElem::~CLi stElem(void)
                          {}
                          >
                          void CListElem::Read LogFile()
                          {
                          // Open the LogFile
                          >
                          CFile LogFile;
                          CFileException e;
                          char* pLogFileName = "Log.log";
                          if( !LogFile.Open( pLogFileName, CFile::modeRead , &e ))
                          {
                          #ifdef _DEBUG
                          afxDump << "The file is not open " << e.m_cause<< "\n";
                          #endif
                          }
                          >
                          // Reading part
                          >
                          // while not end of file
                          // read every character of the Log file and put it
                          into the structure above
                          >
                          }
                          >
                          struct
                          {
                          char strDateHour[30];
                          char strName[80];
                          double value;
                          } Data[1000];
                          >
                          Now the question is how to test the end of a CFile file ? ( a kind of
                          EndOfFile).
                          >
                          Many Thanks
                          >
                          Octavio
                          >
                          I am not sure where this CFile class belongs to, could you please
                          enlighten me, so I could help you, hopefully?
                          Ah, I have got it, it`s an MFC Class, aren`t it?
                          Well if you are using the mfc class, you could compare wheather the
                          read methode, returned the passed amount of bytes, else it should get
                          to the end of the file. I do not found a special methode to querry
                          this.

                            Comment

                            • Jim Langston
                              #8
                              Re: Code for read a file

                              "Hollywood" <freeposte1@gma il.comwrote in message
                              news:1190729123 .791178.79070@1 9g2000hsx.googl egroups.com...
                              Hello members of the comp.lang.c++,
                              >
                              My log file is made of a set of 1000 following lines kind:
                              >
                              21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
                              21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
                              ....
                              >
                              commas ',' are used as field separators (data, name, value).
                              >
                              I'd need a program that read any field into the following structured
                              table (without the commas)
                              >
                              struct
                              {
                              char strDateHour[30];
                              char strName[80];
                              double value;
                              } Data[1000];
                              >
                              Please can you explain a simple code to do so ?
                              Output of the following program is:

                              Date/Time: 21/09/07 13:49:56
                              Name: MW.SET.D_IGLS
                              Value: 2

                              To get the std::string into a c-style array use strcpy such as:
                              strcpy( strDateHour, DateHour.c_str( ) );

                              Since this is a CFile forget about it, Windows specific, but you just want
                              to read an entire line and parse it.

                              #include <sstream>
                              #include <iostream>
                              #include <string>

                              int main()
                              {
                              std::string Foo("21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0" );
                              std::stringstre am Bar( Foo );

                              // Read date from foo
                              std::string Date;
                              Bar >Date;
                              std::string Hour;
                              std::getline( Bar, Hour, ',' );

                              std::string DateHour = Date + " " + Hour;

                              std::string Name;
                              std::getline( Bar, Name, ',' );

                              double Value;
                              Bar >Value;
                              std::cout << "Date/Time: " << DateHour <<
                              "\nName: " << Name <<
                              "\nValue: " << Value << std::endl;
                              }


                                Comment

                                • Hollywood
                                  #9
                                  Re: Code for read a file

                                  On 25 sep, 19:55, Sze <kamistr...@gmx .dewrote:
                                  On 25 Sep., 19:43, Sze <kamistr...@gmx .dewrote:
                                  >
                                  >
                                  >
                                  >
                                  >
                                  On 25 Sep., 18:15, Hollywood <freepos...@gma il.comwrote:
                                  >
                                  On 25 sep, 17:09, Sze <kamistr...@gmx .dewrote:
                                  >
                                  On 25 Sep., 16:15, Hollywood <freepos...@gma il.comwrote:
                                  >
                                  On 25 sep, 16:05, Hollywood <freepos...@gma il.comwrote:
                                  >
                                  Hello members of the comp.lang.c++,
                                  >
                                  My log file is made of a set of 1000 following lines kind:
                                  >
                                  21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0
                                  21/09/07 13:49:56,MW.SET .GNP_NT,7.00000 0
                                  ....
                                  >
                                  commas ',' are used as field separators (data, name, value).
                                  >
                                  I'd need a program that read any field into the following structured
                                  table (without the commas)
                                  >
                                  struct
                                  {
                                  char strDateHour[30];
                                  char strName[80];
                                  double value;
                                  } Data[1000];
                                  >
                                  Please can you explain a simple code to do so ?
                                  >
                                  Thank-You
                                  >
                                  Octavio
                                  >
                                  I just forgot to tell you the file object is a CFile class one.
                                  >
                                  Perhaps you should, paste your code or a link to it, because else it
                                  looks like
                                  you are searching for a programming slave, instead of someone who is
                                  in a beneficial mood,
                                  so he want to use his time to help you.
                                  Nobody likes it to help somebody with something, who doesn`t seem like
                                  he is trying it by himself.- Masquer le texte des messages précédents -
                                  >
                                  - Afficher le texte des messages précédents -
                                  >
                                  Ok, thank-You for your remarks.
                                  Here goes what I've got :
                                  >
                                  #include "StdAfx.h"
                                  #include "listelem.h "
                                  >
                                  CListElem ObjFile;
                                  >
                                  CListElem::CLis tElem(void)
                                  {
                                  >
                                  }
                                  >
                                  CListElem::~CLi stElem(void)
                                  {}
                                  >
                                  void CListElem::Read LogFile()
                                  {
                                  // Open the LogFile
                                  >
                                  CFile LogFile;
                                  CFileException e;
                                  char* pLogFileName = "Log.log";
                                  if( !LogFile.Open( pLogFileName, CFile::modeRead , &e) )
                                  {
                                  #ifdef _DEBUG
                                  afxDump << "The file is not open " << e.m_cause << "\n";
                                  #endif
                                  }
                                  >
                                  // Reading part
                                  >
                                  // while not end of file
                                  // read every character of the Log file and put it
                                  into the structure above
                                  >
                                  }
                                  >
                                  struct
                                  {
                                  char strDateHour[30];
                                  char strName[80];
                                  double value;
                                  } Data[1000];
                                  >
                                  Now the question is how to test the end of a CFile file ? ( a kind of
                                  EndOfFile).
                                  >
                                  Many Thanks
                                  >
                                  Octavio
                                  >
                                  I am not sure where this CFile class belongs to, could you please
                                  enlighten me, so I could help you, hopefully?
                                  >
                                  Ah, I have got it, it`s an MFC Class, aren`t it?
                                  Well if you are using the mfc class, you could compare wheather the
                                  read methode, returned the passed amount of bytes, else it should get
                                  to the end of the file. I do not found a special methode to querry
                                  this.- Masquer le texte des messages précédents -
                                  >
                                  - Afficher le texte des messages précédents -
                                  That's right, CFile is a MFC class. What I'm searching is a CFile
                                  function that allow to read caracter by caracter in a file and put it
                                  into my structure.

                                  The Microsoft Visual C++ help show me the following :

                                  char pbuf[100];
                                  UINT nBytesRead = LogFile.Read( pbuf, 100 );

                                  Once the pbuf loaded with the lines I'll find a way to parse it
                                  searching for commas and placing the text in between into the corrects
                                  fields of my structure.

                                  Many thanks

                                    Comment

                                    • Hollywood
                                      #10
                                      Re: Code for read a file

                                      SNIP
                                      >
                                      Output of the following program is:
                                      >
                                      Date/Time: 21/09/07 13:49:56
                                      Name: MW.SET.D_IGLS
                                      Value: 2
                                      >
                                      To get the std::string into a c-style array use strcpy such as:
                                      strcpy( strDateHour, DateHour.c_str( ) );
                                      >
                                      Since this is a CFile forget about it, Windows specific, but you just want
                                      to read an entire line and parse it.
                                      >
                                      #include <sstream>
                                      #include <iostream>
                                      #include <string>
                                      >
                                      int main()
                                      {
                                      std::string Foo("21/09/07 13:49:56,MW.SET .D_IGLS,2.00000 0" );
                                      std::stringstre am Bar( Foo );
                                      >
                                      // Read date from foo
                                      std::string Date;
                                      Bar >Date;
                                      std::string Hour;
                                      std::getline( Bar, Hour, ',' );
                                      >
                                      std::string DateHour = Date + " " + Hour;
                                      >
                                      std::string Name;
                                      std::getline( Bar, Name, ',' );
                                      >
                                      double Value;
                                      Bar >Value;
                                      std::cout << "Date/Time: " << DateHour <<
                                      "\nName: " << Name <<
                                      "\nValue: " << Value << std::endl;
                                      >
                                      >
                                      >
                                      }
                                      Thank-you Jim for your code, I'm trying to adapt it to my classes.
                                      Another question please , is there any CFile function that can read a
                                      line (from start to the new line character) into your string Foo. The
                                      length of the lines in my Log files are not the same.

                                        Comment

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