Thread: help plz: opening mutiple files in c

Code:

map<string,ifstream> filehash;
ifstream cur;
for (i=0; i<100; i++) {
    cur.open("name_of_file",ios::in);
    if (cur.fail()) cerr << "Can't open....";
    filehash["name_of_file"] = cur;
}

There may be a limit set by your OS on the number of open files one process can have.

The best way to do this, if all these files are in the same directory, is open the directory -- with opendir() -- read the file names into a vector<string> -- with readdir(), etc -- then you can use that vector in the for loop.

If you are too lazy for that, tho, and all the files are literally called "1" "2", etc, just create a vector of the filenames:

Code:

	vector<string> fnames;
	int i;
	char tmp[8];
	for (i=0;i<100;i++) {
		sprintf(tmp,"%d",i);
		fnames.push_back(tmp);
		cout << fnames[i] <<endl;  // verify
	}