Thread: Counting Files

I need to write a C program for a friend that counts the number of dat files in a certain directory, however, I don't know how to count files in C. Can anyone help me out?

http://www.eskimo.com/~scs/C-faq/q19.20.html

There's no truly portable way. The logic is simple, read all the files in the directory, check if they end in .dat, increment a counter.

For reading files in a directory, there's opendir/readdir in POSIX environments.

Salem,

That's not a C program

I think you meant

Code:

#include <stdlib.h>
int main(void)
{
    return system("ls *.dat | wc");
}

Code:

#include <iostream>
#include <windows.h>
#include <string>
#include <fstream>

using namespace std;

int main()
{
fstream ft;
ft.open("store.txt",ios::out);
WIN32_FIND_DATA FindFileData; 
HANDLE hFind = INVALID_HANDLE_VALUE; 
char DirSpec[MAX_PATH]; // directory specification 


cout<<"Please enter your path"<<endl;
cout<<"\nEg. C:\\Program Files\\Common Files\\System  "<<endl;
cout<<">>";

cin.get(DirSpec, MAX_PATH);
cout<<"\n";
strncat(DirSpec, "\\*", 3);
hFind = FindFirstFile(DirSpec, &FindFileData);
int cond=0;
	if(hFind == INVALID_HANDLE_VALUE)
	{
	cout<<"Error: invalid path\n";
     cond=1;
	}

if (cond!=1)
{


	while(FindNextFile(hFind, &FindFileData) != 0)
	{
    char array[81];
    
	ft<<FindFileData.cFileName<<"\n";
	cout<<FindFileData.cFileName<<"\n";


	
	}

FindClose(hFind);
}
ft.close();
/*------------------------------------------------------*/
cout<<"\n\nNow enter the extension of the files you wish to count"<<endl;
cout<<"Example (mp3 or dat...)"<<endl;
cout<<">>";

char extension[81];
cin>>extension;

int s_e = strlen(extension);

fstream file_pointer;
file_pointer.open("store.txt",ios::in);
int file_count=-1; //to account for eof anomoly
do
{
    char stuff[100];
    file_pointer>>stuff;
    
    
    int counter=0;
    int check=0;
    int s = strlen(stuff);
    for (int i=0; i<s; i++)
    {
        if(stuff[i]==extension[0])
        {
            for (int b=0; b<s_e; b++)
            {
                if(stuff[i+b]==extension[counter])
                {
                    check++;
                    counter++;
                }    
            } 
            if(check==s_e)
            {
                file_count++;
            }
            counter=0;
            check=0; 
        }          
    }
    
    
}while(file_pointer.peek()!=EOF);
file_pointer.close();               

cout<<"\nThere were "<<file_count<<" files found";    
  
cin.get();
cin.get();


}

My sample input...

Code:

Please enter your path

Eg. C:\Program Files\Common Files\System
>>C:\program files\common files\system

..
ado
directdb.dll
msadc
Ole DB
wab32.dll
wab32res.dll


Now enter the extension of the files you wish to count
Example (mp3 or dat...)
>>.dll

There were 3 files found

This code was written using a snippet from the FAQ. It's probably a lot more cumbersome than it should be but it appears to work. Basically i'm doing what cwr suggested.

treenef: your program will miss the first file because you toss its filename into the bit bucket. FindFirstFile() returns the first filename in the WIN32_FIND_DATA and you need to add it to the list before calling FindNextFile() the first time. use a do-while loop makes this easier to code.

Code:

 do {
    ft<<FindFileData.cFileName<<"\n";
    cout<<FindFileData.cFileName<<"\n";
 } while( FindNextFile(hFind, &FindFileData) != 0);

You could actually do the program without using the file. Get the extension from the keyboard first then search the directory for it. That eliminates the need for the file.

I appreciate all the help. Thanks!