file i/o problem (not about vc++)

[airswit]

hi, i was having trouble with this code opening the file:
void loadstats()
{
fstream input;
char name[]="save.txt";
input.open(name, ios::in|ios:ut|ios::noreplace);
if (input.fail())
{
input.open(name, ios::in|ios:ut);
if (input.fail())
cout<<&quot;this shows up at runtime&quot;;
}
else
{
cout<<&quot;Enter Player 1 name: &quot;;
cin>>players[1];
cout<<&quot;Enter Player 2 name: &quot;;
cin>>players[2];
input<<players[1]<<endl<<players[2];
}
input>>players[1]>>players[2];
cout<<players[1]<<' '<<players[2]<<endl;
system(&quot;pause&quot;
}


and i was wondering if anyone could help me out. the file doesn't open if it was created, so when i try to load to the 'players' variables, nothing happens and the default values remain. ps, players is declared as:
char players[3][20]={&quot;&quot;,&quot;Player 1&quot;,&quot;Player 2&quot;};

 

[palbano]

>> input.open(name, ios::in|ios:ut);

that should work unless maybe some other process has the file open exclusively?

-pete

 

[airswit]

for some reason, and i don't know why, that code just doesn't want to work. i put it in its own program, compiled it, and it just doesn't want to open the file after it is created the first time through!

 

[palbano]

Are you saying you see this cout<<&quot;this shows up at runtime&quot;; the second time you execute?

-pete

 

[airswit]

that's exactly what i mean. like once the file 'save.txt' is created, that cout is executed instead of the file opening for reading/writing

 

[Federal102]

Is this what you are trying to achieve?

fstream fs;
char name[] = "save.txt";
fs.open(name, ios::in)
if(fs.fail())
{
 cout << &quot;this shows at runtime&quot; << endl;
 fs.clear();
 fs.open(name, ios::out);
}

 

[palbano]

you have to use fstream::clear() after a failure before using the stream object again.

-pete

 

[airswit]

okay, this is what i want to do. if the file doesn't exist, i want to create it and input from user. if the file already exists, i want to read from the file, that's why i had the open(name, ios::in|ios:ut|ios::nocreate) then the open(name, ios::in|ios:ut)

 

[Rahulc]

airswit:

The problem here is that you are not clearing the failed bit
after the first failure with 3 flags. This needs to be reset manually for the stream in concern. After you do that, an existing file can be opened with just in &/or out mode. So here is the corrected code:
-----------------------------------
void loadstats()
{
fstream input;
char name[]=&quot;save.txt&quot;;
input.open(name, ios::in|ios:ut|ios::noreplace);
if (input.fail())
{
input.clear();
input.open(name, ios::in|ios:ut);
if (input.fail())
cout<<&quot;this shows up at runtime&quot;;
}
else
...
...
-----------------------------------------
Hope this helps.

Rahul

 

[airswit]

thanks rahulc, that worked nice. thanks a bunch again!