Sir? Builtin Function Help

NaumanMalik

Hi, How are you?...i hope you are doing fine... i want to ask is there any built in function to get on exact line in a file? Like: FILE DATA: 1)Start 2)Mid 3)Username 4)END i want to get the pointer of file handler on 3 so that i can read that specific line.... or Can we use Seekg.(); function in this case? Kindly help please

Greg Utas

I don't know of such a function. If each line ends in an '\n', you can use std::getline to read each one and count up to the line you want. seekg moves by a specified number of characters, so it won't help unless lines are padded to a fixed length.

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NaumanMalik

#include
#include
using namespace std;

void Signup(int UserCheck)
{
char Firstname[30] = { 0 }, Lastname[30] = { 0 }, Username[11] = { 0 }, Password[11] = { 0 }, ConfirmPassword[11] = { 0 }, File[50] = { 0 }, CNIC[16] = { 0 };
cout << "Sign Up:\nFirst Name: "; cin >> Firstname;
cout << "Last Name: "; cin >> Lastname;
ifstream Read;
while(true)
{
cout << "Uername (eight to ten letters only): "; cin >> Username;
if(UserCheck == 1)
{
strcat(File, "S"); strcat(File, Username); strcat(File, ".txt");
}
else if(UserCheck == 2)
{
strcat(File, "B"); strcat(File, Username); strcat(File, ".txt");
}
Read.open(File);
if((strlen(Username) >= 8 && strlen(Username) <= 10) && (!(Read.is_open())))
{
Read.close();
break;
}
else
{
cout << "\nUsername should be unique and contain 8-10 letters only.\n";
}
}
cout << "CNIC:";
for(int i = 0; i < 15; i++)
{
if(i == 5 || i == 13)
{
cout << "-"; CNIC[i] = '-';
}
else
{
cin >> CNIC[i];
}

}
while(true)
{
	cout << "Password: "; cin >> Password;
	if(strlen(Password) >= 8 && strlen(Password) <= 10)
	{
		while(true)
		{
			cout << "Confirm Password: "; cin >> ConfirmPassword;
			if(strcmp(Password, ConfirmPassword) == 0)
			{
				break;
			}
			else
			{
				cout << "\\nPassword did not matched.\\n";
			}
		}
		break;
	}
	else
	{
		cout << "\\nPassword is not acceptable, it should have only 8-10 letters.\\n";
	}
}
ofstream Write(File);
Write << Firstname << endl;
Write << Lastname << endl;
Write << Username << endl;
Write << CNIC << endl;
Write << Password << endl;
Write.close();

}
//void Login(int UserCheck)
//{
// char File[50] = { 0 }, Username[11] = { 0 }, Password[11] = { 0 }, CheckPassword[11] = { 0 };
// ifstream Read;
// while(true)
// {
// cout << "Uername (eight to ten letters only): "; cin >> Username;
// if(UserCheck == 1)
// {
// strcat(File, "S"); strcat(File, Username); strcat(File, ".txt");
// }
// else if(UserCheck == 2)
// {
// strcat(File, "B"); strcat(File, Username); strcat(File, ".txt");
// }
// Read.open(File);
// if((strlen(Username) >= 8 && strlen(Username) <= 10) && (Read.is_open()))
// {
// break;
// }
// else
// {
// cout << "\nInvalid Username.\n";
// }
// }
// int Line = 1, i = 0; char temp = 0;
// while(Line != 5);
// {
// Read>>temp;
// cout << temp;
// if(temp == '\n')
// {
// Line++;
// }
// i++;
// }

Lost User

The simplest way to do this is to read the file line by line and check for the data that you are interested in. Remember a text file is just a stream of characters with no structure so you cannot easily use file positioning to get to a particular item.

Lost User

If you have questions or comments then please use the Reply link, not the Email.

NaumanMalik

but i want to privately message you dont want leak my code please check the inbox kindly ... Thank you

Lost User

Sorry, all help provided by CodeProject members is done in public through the forums on this website. If you want private help then you are in the wrong place.

Greg Utas

Oh, this explains why I got an email that contained code but couldn't find the same message on this board. Sorry, I don't do code inspections. If you don't know how to use a debugger, you need to learn now. The days when I wrote code with very few errors are gone. I wouldn't be able to do anything without a debugger now. They're so much better and easier to use than they were 40 years ago that I just focus on the design and then use the debugger to fix the details that I got wrong. :-D

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NaumanMalik

Okay may be i disturbed everyone here for nothing... I'm really sorry for stupid questions. I do actually know how to debug you sir when you get stuck only then you ask for help... but that debugger get the job done after 7 hours :| ... and Richard's steps may be helpful but it is very difficult for me to understand it you know... Anyways Thank you for your help, i appreciate your help ;)

Dave Kreskowiak

If you can't write a function to search for a specific character in a text file, ('\n'), counting how many times you see that character, your code isn't worth hiding.

Asking questions is a skill CodeProject Forum Guidelines Google: C# How to debug code Seriously, go read these articles.
Dave Kreskowiak