Thread: File I/o

Hi,
the code below compiles and runs. The program reports an error incase a user provides a path name of a .doc file. the program only accepts a notepad file(.txt) in drive C. if the .txt file is in another folder, eg., c:\my documents\dominic.txt, the program reports "Invalid filename c:\my documents\dominic.txt". My aim is to have this code accept all files (irrespective of format) in my PC's disk. Kindly teach me how to achieve this.

Code:

#include <iostream>
#include <string.h>
#include <time.h>
#include <conio.h>
#include <fstream>

#define DATA	 0x378  //Data Register base address
#define STATUS   DATA+1 // Status Register address
#define CONTROL  DATA+2  //Control Register address

using namespace std;
//prototyping
void Interface (ifstream &fin, char (*Secure)(char c));
char EncDec (char c);
//main (): manage file stream extraction
int main ()
{
	const int MaxFileNameSize=256;
	// prompt and extract the name of the file
	cout<<"Enter the name of the file:"<<flush;
	char FileName[MaxFileNameSize]; //string FileName;
	//validate the file name provided
	cin>>FileName;
	//ifstream  fin(Filename.c_str());
	//converts the string type to a char array type for the function
	ifstream fin(FileName);
	if (fin)
	{
		//we have a valid file, so determine the action
	cout<<"The file contents to be made secure through"
		<<"bit level transformation (Y,N):"<<flush;

		char reply;
		cin>>reply;

	//process the file according to the user request

		switch (reply)

		{

		case 'Y':

			Interface(fin, EncDec);

			break;

		case 'N':

			cout<<"File is left in plain version";

			break;

		default:
			{
                                 			
			cerr<<"Bad request"<<endl;

				return 1;
			}
			   
		
		}

	}

		//Process invalid filename.

	else

		{

		cerr<<"Invalid file name:"<<FileName<<endl;

			return 1;

		}

return 0;
	}

	//Interface (): Manage the interface to the stream cipher 
	//using the EncDec () function.
	void Interface (ifstream &fin, char (*secure)(char c))
	{

	//Extract, modify and save one-character-at-a-time 

		//from the file.

	char CurrentChar;  //currenrly extracted character

		while (fin.get(CurrentChar))

	{	//modify and save the current character using
			//Secure()

		CurrentChar=(*secure)(CurrentChar);

		ofstream file_op("C:\\jacob.txt", ios::app);

			file_op<<CurrentChar;

		}

                cout<<"EOF"<<endl;

		return;

	}

	//EncDec(): manage writing to and reading from the 

	//standard parallel port.

	char EncDec (char c)
	

	{
		char s, n;
		s=c;

outportb(CONTROL,inportb(CONTROL)&0xF0|0x04); /*initialise the
														CONTROL port for data input*/

		outportb(DATA,s);   
/*write c to the DATA register*/

		clock_t start_time;

		start_time=clock();

while ((clock()-start_time)<0.25*CLK_TCK);//propagation delay time

n=(inportb(STATUS)&0xF0);  /* read MSnibble*/

n=n|(inportb(CONTROL)&0x0F);/*Read LSnibble*/

n=n^0x84; /*toggle bit 2 and 7 */
				 					return n;
	

	}