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How do I store a valid filepath, so that I can retrieve it later?

Ok, I am trying to write a program that goes back in time one day at a time. I have a database where whenever there is data available for that day it would be located at C:\2010\4\1\ABC.txt. Given that today is 4/2 the program looks back to yseterday to see if ABC.txt exists for 4/1, then 3/31, then 3/30..etc...for up to 9 days.

On line 117...I do not know how to keep track of valid FilePaths ie there exists an ABC.txt file for that day. How do I make a list of valid FilePaths that I can call on later?

Thanks for your help!

#include <time.h>
#include <stdio.h>
#include <string>
#include <fstream>
//#include <afx.h>

using namespace std;

unsigned short GetTodaysDate(unsigned short &year, unsigned short &month, unsigned short &day)
{
	time_t rawtime;        //rawtime is variable of data type time_t, related to time.h
    struct tm * timeinfo; //timeinfo points to a struct of type tm, related to time.h
    char str[60];

    rawtime = time (NULL); //retrieves number of seconds from 1/1/70, in GMT, stores in address of rawtime
    timeinfo = localtime ( &rawtime ); //localtime takes rawtime, and creates a "tm" struct

   strftime(str, sizeof(str) , "%Y %m %d", timeinfo);  //formats the timeinfo struct into a string
//   printf(str);                                                       //outputs string to let me see if date is right
   
   year = atoi(&str[0]);   
   month = atoi(&str[5]);
   day = atoi(&str[8]);

   return (year, month, day);
}


string FindOneDayEarlier(unsigned short &year, unsigned short &month, unsigned short &day)
{
//months with 31 days: 1, 3, 5, 7, 8, 10, 12
//months with 30 days: 4, 6, 9, 11
//months with 28/29 days: 2

	day = day - 1; //decrement the day

    if (day == 0) //if day = 0, today must be 1st of the month
	{    
			if (month == 2 || month == 4 || month == 6 || month == 8 || month == 9 || month == 11 || month == 1)
			{
				day = 31;
			}

			if (month == 5 || month == 7 || month == 10 || month == 12)
			{
				day = 30;
			}
			if (month == 3)  //if not a leap year, who cares, just search, find nothing, skip, and decrement to 28
			{
				day = 29;
			}


			month = month - 1;
			if (month == 0)  //if this month is Jan, prior month will be Dec.
			{
				month = 12;  //if we are in Dec., we must be in prior year...so...
				year = year - 1; //we will never count back before year 2000, so it's always positive
			}
    }

   char buffer[40];
   sprintf( buffer, "C:\\\\%d\\\\%d\\\\%d\\\\ABC.txt", year, month, day);

   return string(buffer);
}

bool FileExist( string strFilepath )
{
     
    // ifstream is used for reading files
	ifstream inf( strFilepath.c_str() );

    // If we couldn't open the output file stream for reading
    if (!inf)
    {
        return false;
    }
	else
		return true;
	    
}


/* only works with MFC...must remember to "#include <afx.h>"
bool FileExist2( string strPath )
{
        CFileFind ff;

        return FALSE != ff.FindFile( strPath ); //return false 
}
*/


int main()
{
// Get TODAY's date  
   unsigned short year = 0;
   unsigned short month = 0;
   unsigned short day = 0;

	GetTodaysDate (year, month, day);
   
// Given today's date, get YESTERDAY's date in string form to be used in a file path
	string strFilepath;
	int intNumDaystoLookBack = 9;
	int intCount = 0;

	do
	{
		strFilepath = FindOneDayEarlier(year, month, day);//goes back in time, 1 day at a time

//  Given the FilePath for yesterday's date, find out if the Example.txt file exists
		if (FileExist(strFilepath))
		{
			intCount = intCount + 1;
// How do I make note of the filepath and store it...for future use?

		}
	}while (intCount <= intNumDaystoLookBack);


    return 0;
}