Accessing .dat files within a folder

This is a discussion on Accessing .dat files within a folder within the C++ Programming forums, part of the General Programming Boards category; Below, I have c/p my code. The program is supposed to input a folder name, and inside that folder there ...

  1. #1
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    Accessing .dat files within a folder

    Below, I have c/p my code. The program is supposed to input a folder name, and inside that folder there are two .dat files with an array of data in each that I am supposed to read and output the average and the maximum values in each. Can someone help me out please? Also, I do not know what to include in my arguments in my first three function definitions...because when I uncomment my function calls, I get errors that refer to those function arguments. Please help ASAP! Thank you in advance for all the help!

    Code:
    #include <sys/types.h>
    #include <dirent.h>
    #include <errno.h>
    #include <vector>
    #include <string>
    #include <iostream>
    #include <fstream>
    #include <cstdlib>
    #include <cstring>
    
    using namespace std;
    typedef vector<string> stringVector;  //Defines a vector of string values
    const int MAX_SIZE = 31;
    
    void OpenInputFile(ifstream& in_file, char string);
    void OpenOutputFile(ofstream& out_file, char string);
    int ReadArray(ifstream& in_file, int number[]);
    float CalcAverage(int array[]);
    float CalcMax(int array[]);
    int getDir(string dir, stringVector &files);
    
    int main()
    {
        ifstream indiv_file;
        ofstream out_file;
        int count = 0, array[MAX_SIZE], next; 
        float average_temp, maximum_temp;
        int start;
        string dir, intro, compound;
        
        intro = "C://*/*/*/*/*/*/*/";
        cout << "Enter directory with files available for use: ";  //Lists the files in the current directory you could input . 
        cin >> dir;
        compound = intro + dir;
        stringVector files = stringVector();
    	
        /*cin >> InputFiles/; 
        string dir; 
        get_Dir() --> files[size] 
        ifstream ifs; 
        ifs.open("path+numbers.dat") 
        open((dir+files[i]).c_str())*/
        
        getDir (dir, files);
        
        for (unsigned int count = 0; count < files.size(); count++)
        {
            if (files[count].at(0)!= '.') // if the file is a valid file
            {
               //indiv_file.open((compound + files[i]).c_str());
               indiv_file.open((dir + files[count]).c_str());
               cout << endl << dir + " " + files[count] << endl;
               for (int j = 0; j < count; j++)
    	       {
                   while (indiv_file >> next)
    	           {
                         cout << array[j];
                         j++;
                   }
                   cout << array[j] << " " << endl;
                }
                if(count == MAX_SIZE)
                     break;
            }
            indiv_file.close();
         }
        //OpenInputFile (array, string);
        //OpenOutputFile (out_file, string);
        //ReadArray (in_file, number[]);
        average_temp = CalcAverage(array);
        maximum_temp = CalcMax(array); 
        
        cin >> start;
        return 0;
    }
    int getDir (string dir, stringVector &files)
    {
    	DIR *dp;
    	struct dirent *dirp;
    	
    	if((dp  = opendir(dir.c_str())) == NULL) {
    		cout << "Error(" << errno << ") opening " << dir << endl;
    		return errno;
    	}
    	while ((dirp = readdir(dp)) != NULL)  {
    		files.push_back(string(dirp->d_name));
    	}
    	closedir(dp);
    	return 0;
    }
    void OpenInputFile(ifstream &in_file, int string)
    {
         char symbol;
         ifstream in;
         in.open("January.dat");
         if (in.fail())
         {
            cout << "Failed to open file." << endl;
            exit(1);
         }
         
         do
         {
            cin.get(symbol);
            cout << symbol;
         } while (symbol != '.');
                 
         in.open("February.dat");
         if (in.fail())
         {
            cout << "Failed to open file." << endl;
            exit(1);
         }
    }
    void OpenOutputFile(ofstream &out_file, int string)
    {
         ofstream out;
         out.open("MaxOfArrays.txt");
         out_file.open("AveragesOfArrays.txt");
    }
    int ReadArray(ifstream &in_file, int number[])
    {
         int next;
         ifstream in;
         while (in >> next)
         {
               cout << next;  
         }   
         return 0;
    }
    float CalcAverage(int array[])
    {
         int average, total = 0, i = 0;
         
         for (i; i < MAX_SIZE; i++)
         {
             total += array[i];         
         } 
         
         average = (total / i);
         return 0;  
    }
    float CalcMax(int array[])
    {
         return 0;  
    }

  2. #2
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    You should be passing the name of the directory, which is a string, so it seems the signature of OpenInputFile() should be
    Code:
    void OpenInputFile(ifstream& in_file, string dir_name)
    Similarly for OpenOutputFile().

    Also, your call of ReadArray() gives the first argument as in_file, but in main() you have no variable by that name.

  3. #3
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    thanks, that makes sense i s'pose. However, I'm getting large numbers (nothing like what it should be - the data in the .dat file is what I should be getting) that don't make any sense. It happens in this portion of the code:

    Code:
    for (unsigned int count = 0; count < files.size(); count++)
        {
            if (files[count].at(0)!= '.') // if the file is a valid file
            {
               //indiv_file.open((compound + files[i]).c_str());
               indiv_file.open((dir + files[count]).c_str());
               cout << endl << dir + " " + files[count] << endl;
               for (int j = 0; j < count; j++)
    	       {
                   while (indiv_file >> next)
    	           {
                         cout << array[j];
                         j++;
                   }
                   cout << array[j] << " " << endl;
                }
                if(count == MAX_SIZE)
                     break;
            }
            indiv_file.close();
         }
    Can you help me there? Thanks again for the help!

  4. #4
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    You're printing values from array, but you haven't assigned any values to array's elements so what you're getting is just initialized garbage.

  5. #5
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    how do i do that?

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