Check a DAT file for data

Pramann · #1 05-Dec-2007, 10:47

I'm using C++, Visual Net
and I'm trying to use a DAT file to save vectors
The program i am writing is like a database were you can enter, view, and change the data inside the DAT file.
the vector i'm using is:

CPP / C++ / C Code:

struct Birthday
	{ 
		string Name;
		int Month;
		int Day;
		int Year;
	};

vector<Birthday> Birthdays;

what do i code so that if the file has no data it will just continue on?

fakepoo · #2 05-Dec-2007, 11:11

How about a function like:

CPP / C++ / C Code:

void LoadFromFile( string FileName, vector<Birthday>& Birthdays )
{ if( file does not exist ) return;

  // Assuming each Birthday is on a single line with Name,Month,Day,Year separated by a delimiter (like a comma)
  
  // for each line, create a Birthday struct (Birthday), populate it, and add it to Birthdays via Birthdays.push_back( Birthday );
}

CPP / C++ / C Code:

//call it like this:
vector<Birthday> Birthdays;
LoadFromFile("C:\\Birthdays.dat",Birthdays);

Pramann · #3 06-Dec-2007, 10:36

Okay so my protocol is

CPP / C++ / C Code:

int check = 1;
int LoadFromFile("C:\\Birthdays.DAT",vector<Birthday> Birthdays, int check);

and then i call it up like

CPP / C++ / C Code:

LoadFromFile("C:\\Birthdays.DAT",Birthdays, check);
if(check == 1)
{
	List(Birthdays);
}

List being another function of mine that prints out the Birthdays

the function LoadFromFile contains

CPP / C++ / C Code:

int LoadFromFile("C:\\Birthdays.dat", vector<Birthday>& Birthdays, check )
{ 
	if( file does not exist )
	{
		check = 0;
	}
	return check;
}

why doesn't it work still?

fakepoo · #4 06-Dec-2007, 11:53

A couple of things...

1) your function definition for Load(....) does not match the implementation character-by-character.

2) file does not exist is not a value/function/anything. You have to reference a function that already exists. I'm not sure what that might be but check for something like bool FileExists( char* filename ).

Pramann · #5 06-Dec-2007, 17:29

thanks
i fixed it
i used cin.peek() to see if the file has anything in it

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Check a DAT file for data

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