Problem with reading from FILE*

[Guzfraba]

int main(){

	vector<string> strs;
	FILE* f = _popen("tasklist", "r");
	char str[90];

	while (fgets(str, 90, f)) {
		strs.push_back(str);
	}

	

	for (string& x : strs) {
		
		cout << x;

		x.pop_back();
		cout << x<<endl;

		x.pop_back();                       //error
		cout << x<<endl<<endl;
	}
	
	_pclose(f);

	cin.sync();
	cin.ignore();
	return 0;
}

The pop_back() call from line 21 causes unhandled exception std::out_of_range. Doing x.erase(x.end() - 2, x.end()); instead of the two pop_backs causes the same thing. This means there is a problem with the forelast character in x. What is wrong ?

[Guzfraba]

I'm trying to delete last two characters in every string from strs container. Ignore the couts in my loop.

[Thomas1965]

You should check if the length of the string is >= 2 before you remove two characters.

[Guzfraba]

What a shame, that was the problem indeed. It seems the first string returned from "tasklist" command is only containing a newline character. I had no idea.