io stream and string class problems

Hi
My program is eventually supposed to read in a .cpp file, ask the user if they want to get rid of the white space lines and/or single line comments, show the changed file to the screen and then ask if they want to save the file or not. I cannot get the program to get rid of the whitespace or comments. It will complie but I will get a run time error that will crash the program. Any help would be appreciated.

Thanks

header

Code:

---


#ifndef IOSTR_H_
#define IOSTR_H_


#include <iostream>
#include <fstream>
#include <string>

using namespace std;



class ioStr
{
  private:
      char * str;
      int len;

      ifstream fins;
      ofstream fout;

      int numLines;
     



  public:
      ioStr(const char * s); // constructor
      ioStr();              // default constructor
      ioStr(const ioStr & ); // copy constructor
      ~ioStr();   
      ioStr & operator=(const ioStr &);
      ioStr & operator=(const char *);

      void OpenOutFile();
      void OpenInFile();
      void SetNumLines();

      int NumLine(){return numLines;}

      void Display();
      void DisplayNoCom();
      void DisplayNoWht();

      void CloseInFile(){fins.close(); fins.clear();}
      void CloseOuFile(){fout.close(); fout.clear();}





};
#endif

---

implementation

Code:

---



#include "ioStr.h"



ioStr::ioStr(const char * s)  // construct String from C string
{
    len = strlen(s);            // set size
    str = new char[len + 1];      // allot storage
    strcpy(str, s);              // initialize pointer
}

ioStr::ioStr()      // default constructor
{
    len = 0;
  numLines = 0;
    str = new char[1];
    str[0] = '\0';                // default string

}
                                     
ioStr::ioStr(const ioStr & st) // Copy Constructor
{
    len = st.len;              // same length
    str = new char [len + 1];  // allot space
    strcpy(str, st.str);      // copy string to new location
}

ioStr::~ioStr()        // necessary destructor
{
    delete [] str;                    // required
} 

    // assign a String to a String
ioStr & ioStr::operator=(const ioStr & st)
{
  if (this == &st)
        return *this;
    delete [] str;
    len = st.len;
    str = new char[len + 1];
    strcpy(str, st.str);
    return *this;
}

    // assign a C string to a String
ioStr & ioStr::operator=(const char * s)
{
  delete [] str;
    len = strlen(s);
    str = new char[len + 1];
    strcpy(str, s);
    return *this;
}


void ioStr :: OpenInFile()
{
  fins.open("c:\\temp\\source.cpp");
    if ( ! fins.is_open())
    {
        cout << "Input file opening failed.\n";
//      fail = true;
    }
}

void ioStr :: SetNumLines()
{
  string temp;

  while(! fins.eof())
  {
      getline(fins, temp, '\n');
      numLines++;
  }
}
void ioStr :: OpenOutFile()
{
    fout.open("c:\\temp\\newsource.cpp");
    if (! fout.is_open())
    {
        cout << "Output file opening failed.\n";
  //  fail = true;
    }
}

void ioStr :: Display()
{
  char ch;

  while((ch = fins.get()) != EOF )
        cout << ch;
}

void ioStr :: DisplayNoCom()
{
  for (int i = 0;i<=numLines;i++)
  {
      //fins.get(str, 120,' ');
      //fins.get();
     
     
//      fins.get(str);
      len = strlen(str);
      if((str[1] != '/') && (str[2] !='/'))
      cout<<str<<endl;     
  }
}

void ioStr :: DisplayNoWht()
{
  for (int i = 0;i<=numLines;i++)
  {     
      fins.getline(str,1500); 
      for(int j =0; str[j]== '\n';j++) 
      if(isspace(str[j]) == false)
            cout<<str<<endl;

  }
}

---

test file

Code:

---


# include "ioStr.h"



int main()
{
  ioStr source;
  int num;

  source.OpenInFile();
  source.Display();
  source.CloseInFile();
  source.OpenInFile();
  source.SetNumLines();
  num= source.NumLine();
 

  cout<<endl<<num<<endl<<endl;

  source.CloseInFile();
  source.OpenInFile();

  //source.DisplayNoCom();
  source.DisplayNoWht();










  return 0;
}

---

I've changed part of the implementation file. It will now get rid of the whitespace and comments but i still get a run time error. Any help would be great!

Code:

---


#include "ioStr.h"



ioStr::ioStr(const char * s)  // construct String from C string
{
    len = strlen(s);            // set size
    str = new char[len + 1];      // allot storage
    strcpy(str, s);              // initialize pointer
}

ioStr::ioStr()      // default constructor
{
    len = 0;
  numLines = 0;
    str = new char[1];
    str[0] = '\0';                // default string

}
                                     
ioStr::ioStr(const ioStr & st) // Copy Constructor
{
    len = st.len;              // same length
    str = new char [len + 1];  // allot space
    strcpy(str, st.str);      // copy string to new location
}

ioStr::~ioStr()        // necessary destructor
{
    delete [] str;                    // required
} 

    // assign a String to a String
ioStr & ioStr::operator=(const ioStr & st)
{
  if (this == &st)
        return *this;
    delete [] str;
    len = st.len;
    str = new char[len + 1];
    strcpy(str, st.str);
    return *this;
}

    // assign a C string to a String
ioStr & ioStr::operator=(const char * s)
{
  delete [] str;
    len = strlen(s);
    str = new char[len + 1];
    strcpy(str, s);
    return *this;
}


void ioStr :: OpenInFile()
{
  fins.open("c:\\temp\\source.cpp");
    if ( ! fins.is_open())
    {
        cout << "Input file opening failed.\n";
//      fail = true;
    }
}

void ioStr :: SetNumLines()
{
  string temp;

  while(! fins.eof())
  {
      getline(fins, temp, '\n');
      numLines++;
  }
}
void ioStr :: OpenOutFile()
{
    fout.open("c:\\temp\\newsource.cpp");
    if (! fout.is_open())
    {
        cout << "Output file opening failed.\n";
  //  fail = true;
    }
}

void ioStr :: Display()
{
  char ch;

  while((ch = fins.get()) != EOF )
        cout << ch;
}

void ioStr :: DisplayNoCom()
{
  int count;
  for (int i = 0;i<=numLines;i++)
  {
      fins.getline(str, 1000, '\n');
      if((str[0] != '/') && (str[1] !='/'))
      {
        cout<<str<<endl;
        count++;
      }
     
  }
  commentLines = numLines - count;
}

void ioStr :: DisplayNoWht()
{
  for (int i = 0;i<=numLines;i++)
  {     
      fins.getline(str, 1000, '\n');
      fins.ignore(1000,' ');
      cout<<str<<endl;;
  }

}

---

Above the for() in

Code:

---

void ioStr :: DisplayNoWht()
{
  for (int i = 0;i<=numLines;i++)
  {     
      fins.getline(str, 1000, '\n');
      fins.ignore(1000,' ');
      cout<<str<<endl;;
  }
}

---

Add

Code:

---

str = new char [1000];

---