CODEWITHSUNDEEP
c++bufferstringstream
Shinji-san
Shinji-san

Reputation: 1001

Stringstream not extracting after clearing input buffer

I'm having trouble with stringstream. So I am getting tokens from a csv file and assigning them to some variables but I am clearing stringstream sv after I read every token and after the very first token it stops working and I am not sure why. The commented line, 'stops working here', is where it stops correctly extracting. In visual studio it says sv is '0x000' even after insert operation. I even have another loop in my code that clears it once and does insertion again and that works.

int reviewid;
    int userid;
    int rating;
    string reviewDate;
    getline(reviewReader, dummyLine); // skip first line of input
    while (getline(reviewReader, input)) {
        stringstream ss, sv; // sv used for type conversions
        // using delimeter of commas

        // order of input in the file is [ movieid, moviename, pubyear]
        // , first toiken is movieid, second token will be moviename
        // third token will  be pubyear
        ss << input; // take in line of input
        getline(ss, token, ','); // first token
        sv << token; // convert toiken to int
        sv >> reviewid;
        getline(ss, token, ','); // 
        sv.str("");
        sv << token; // STOPS WORKING HERE
        sv >> movieid;
        sv.str(""); // clear buffer
        getline(ss, token, ',');
        sv << token;
        sv >> userid;
        sv.str("");
        getline(ss, token, ',');
        sv << token;
        sv >> rating;
        sv.str("");
        getline(ss, token, ',');
        sv << token;
        sv >> reviewDate;
        sv.str("");  

        Review r = Review(reviewid, movieid, userid, rating, reviewDate); // make review object
        reviews.push_back(r); // add it to vector of reviews
    }

Upvotes: 1

Views: 84

Answers (1)

Alexander
Alexander

Reputation: 758

str("") does not change the state of your stream. i.e. if the stream was in eof state before str("") it will still be in the same state after str(""). In order to clear the state please use clear();

sv.str("");
sv.clear();

Upvotes: 1

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